PAGE 1 of 5
KENNE BELL
Hi Tech Performance Products
BOOST-A-PUMp™ WIRING INSTRUCTIONS
.nstallation of the KENNE BELL BOOST-A-PUMp™(BAP)
is simple and straightforward.
All you need to do is locate
the "HOT" (12 VOLT POSITIVE +) wire going to your pump and wire the BAP in series as shown in the following
diagrams. NOTE: The INPUT wire to the SAP is the fused red wire.
IMPORTANT! ON VEHICLES USING FEEDBACK
TO THE ENGINE COMPUTER TO TELL IT WHEN THE PUMP IS RUNNING - WIRE THE BAP
AFTER THE FEEDBACK WIRE OR THE CHECK ENGINE LIGHT MAY COME ON. WIRE THE BAP ONLY AS SHOWN IN THE FOLLOWING
DIAGRAMS OR DAMAGE MAY OCCUR AND WARRANTY WILL BE VOID ..
FROM FUEL PUMP
RELAY OR OTHER
PUMP SUPPLY
(manual switch,
pressure switch,
etc ...)
+
CD
POSITIVE WIRE---,.
LOCATE
.-------1~~
POSITIVE WIRE GOING TO PUMP
+1 1-
TO GROUND
p
U
M
P
STEP 1
FROM FUEL PUMP
RELAY OR OTHER
PUMP SUPPLY
+
POSITIVEWIRE
r-------1~
TO GROUND
(manual switch,
pressure switch,
etc ...)
p
®
CUT POSITIVE
U
M
WIRE GOING TO PUMP
p
STEP2
.r
';J4M'WI
FROM FUEL PUMP
RELAY OR OTHER
PUMP SUPPLY
+
POSITIVE WIRE
(manual switch,
pressure switch, etc ...)
RUN CABLE TO
INSIDE OF CAR
AND MOUNT
CONTROLLER
TO INTAKE (vacuum switch) or
SUPERCHARGER
or TURBO
..OUTLET
Vacuum I Pressure
MANIFOLD
Switch
(pressure I boost
switch)
STEP3
CAUTION! BOOST-A-PUMP
GROUND IMPORTANT!
Note: Double check ground. If
ground Is inadequate unit may be
damaged.
POSITIVEWIRE
OUT
RED
I
N
P
U
T
BLACK
GROUND
B
A
P
.-------1~
TO GROUND
+
RED
P
0
U
U
T
p
M
P
U
T
o
BLACKr::;'\
GROUND
TAKE THE END OF THE WIRE THAT YOU
CUT COMING FROM THE FUEL PUMP RELAY
OR SWITCH AND CONNECT IT TO THE
FUSED RED WIRE OF BAP. TAKE THE OTHER
END OF THE WIRE THAT YOU CUT GOING
ON TO THE PUMP AND CONNECT IT TO THE
OTHER RED WIRE. CONNECT BLACK WIRES
TO GOOD GROUND. YOUR PUMP WIRE NOW
"GOES THROUGH (IN AND OUT OF)" THE
BOOST-A-PUMP. RUN CABLE FOR SWITCH
AND CONTROLLER AS SHOWN.
r243/12219
KB-20
PAGE 2 of 5
KENNE BELL
PART# KBS9066 I KBS9067 20AMP
KBS906S I KBS9069 40AMP
BOOST·A·PUMp™ INSTALLATION INSTRUCTIONS
I. The Kenne Bell BOOST-A-PUMp™ (BAP) may be mounted anywhere as long as it is protected
water or extreme heat (above 300 F). Preferred mounting is under the seat or in the trunk.
from exposure to
0
2. Locate the 12 volt + wire going to the fuel pump from the fuel pump relay. It is important that you positively
determine the proper wire to splice into or the BAP will not function. If you do not see your vehicle listed on our
FUEL PUMP WIRE GUIDE. use your service manual or contact the dealer to determine the wire color and location.
NOTE: ON VEHICLES WITH COMPUTER CONTROL.THE
BAP SHOULD BEWIRED IN AFTER THE FEEDBACK
TO THE COMPUTER. NOT BEFORE.A CODE MAY BE SET IFTHE COMPUTER SEES HIGHER THAN NORMAL
VOLTAGE TO THE FUEL PUMP.
3. After you have located the fuel pump wire. trial fit the assembly first to insure the cables will reach their proper
installation points.
4. The Cockpit Controller must be located inside the vehicle to allow access to the adjustment knob. The cable has a
plug-in connector that can be routed through a small hole in the firewall or trunk depending on where the BAP
module is mounted. Make sure that the cable will reach the module as this cable CAN NOT be extended. Extendine
this cable will affect the operation of the BAP.
5. The other cable included in the kit goes from the BAP module to the activation switch (VACUUM for normally
aspirated and BOOST for supercharged / turbocharged applications). Route this cable through the firewall or trunk
from the switch location to the module. Make sure that the cable will reach the module because this cable CAN NOT
be extended. Extendine cable will affect operation of the BAP.
6. If the cable(s) will not reach the desired
extended up to ten-(IO) feet.Again. DO
AND/OR BLACK POWER WIRES may
power wires. Make sure all connections
location of the BAP module. the main # 10 AWG POWER WIRES may be
NOT EXTENDTHE MULTI-CONDUCTOR
CABLES. ONLYTHE RED
be extended. Use only # I 0 AWG copper stranded wire to extend the BAP
are solid and free from exposure to moisture.
7. Check to make sure you have the correct activation switch for your application. The VACUUM switch application has
two wires: RED and BLACK (RED from switch connects to the RED wire/ BLACK to BLACK).The SUPERCHARGED
/TURBOCHARGED
switch also has two wires: RED and BLACK.These simply connect to the BOOST switch.
Polarity has no effect.
8. Install the VACUUM switch with a short piece (no longer than 24") of 5/32" vacuum line from a good intake manifold
vacuum source. ON SUPERCHARGED /TURBOCHARGED
applications. install the BOOST switch with a short
piece (no longer than 24") of 5/32" vacuum line to the BLOWER SIDE ONLY of the intake manifold (the BAP will
not function if the line is on the inlet side of the supercharger / turbocharger).
9. Connect the fuel pump wires as shown in STEPS I - 3.The two BLACK ground wires on the BAP module may be
connected to the frame if desired. IMPORTANT:THIS MUST BE A GOOD CLEAN GROUND CONNECTION
FREE OF PAINT. RUST OR OTHER MATERIAL - DAMAGE TO THE UNIT CAN RESULT IF NOT GROUNDED
PROPERLY. (we recommend grounding the BLACK BAP wires to the battery NEGATIVE terminal or to the ground
wire going to the fuel pump).
10. Mount the BAP module with the four (4) included self tapping screws. The module does not need to be mounted to a
metal surface since the two black wires act as a ground.
II.
Plug in the Cockpit
Controller
and activation switch cables. The BAP is now ready for use.
r
117/24819
PAGE 3 of 5
BOOST·A·PUMp™ FUEL PUMP WIRE GUIDE
VEHICLE
YEAR
Mustang 5.0L
Mustang 5.0L
'86 - '90
Mustang
5.0Ll4.6L
'91 - '93/\
'94 - '98/\
*
Ford Trucks
WIRE COLOR
LOCATION
PINK wi BLACK STRIPE
Under driver's seat at relay
GREEN wi YELLOW STRIPE Under mass air meter
In trunk in harness
BROWN wi PINK STRIPE
GREEN wi YELLOW STRIPE Under power distribution box
under hood
Buick GN
'84 - '87
TAN wi WHITE STRIPE
In trunk (left side )+++
Syclone I Typh
'91 - '92
GRAY
Past bulkhead connector towards
pump (see diagram). Fuel pump
relay is located on the left side
firewall. There are 2 relays; one
for the AlC and the other for the
fuel pump (closest to engine).+++
" Includes Cobra
* All models and years from '91 up that we know of ...
+++ You must change the stock fuel pump fuse from 10 AMP to 20 AMP.
NOTE: DO NOT TIE INTO WIRE
AT RELAY - VOLTAGE WILL FEED
BACK TO INPUT OF BAP AND BLOW
FUSE.
Sorry, but we do not have the wire locations and colors for all vehicles, so please consult your service manual or dealer if you
do not see your vehicle listed above, OR you may be able to get info from Taylor Automotive Tech 1(800) 636-6414 or retrieve
information from the internet.
'JICK GN SWITCH PANELS - Note: If using a Kenne Bell KB82068 Fuel Pump / Anti Theft Switch, the switch MUST BE
'--.dYPASSED as the switch is not rated high enough to handle the increased load.
MAKE SURE THE TWO WIRES TOGETHER THAT GO TO THE PRESSURE
I VACUUM SWITCH HAVE VERY GOOD CONNECTIONS
TO
BOOST
A
PUMP
Vacuum I Pressure
Switch
NOTE: THIS CABLE CAN BE
SHORTENED
IF DESIRED
NOTE SOME VEHICLES
HAVE A BUILT·IN SAFETY SYSTEM (BELOW) WHERE THE ENGINE WILL NOT START UNTIL THE OIL PRESSURE
HAS BUILT UP ENOUGH TO ACTIVATE THE FUEL PUMP RELAY DO NOT WIRE THE BAP INTO THIS CIRCUIT
IF YOU ARE NOT SURE
WHETHER YOUR VEHICLE HAS THIS DEVICE LOCATE THE FUEL PUMP FIRST AND WIRE THE BAP CLOSEST TO THE PUMP
r------------------_
-:r---~
TO
FUEL
PUMP
WIRE IN
BOOST-A-PUMP
HERE
FUEL
PUMP
RELAY
Oil Pressure
Sender
1072607
PAGE 4 of 5
KENNE BELL
BOOST-A-PUMP
TECHNICAL INFORMATION AND INSTALLATION INSTRUCTIONS
OVERVIEW
The Kenne Bell BOOST-A-PUMP is designed to increase the output of any fuel pump from 1% up to 50%. It accomplishes this by increasing the
voltage approx. 5 volts (10% per volt). It will also maintain this pre-set voltage or output within 1% regardless of battery voltage (within 9 -17 volts).
A little known fact is that voltage to a fuel pump can vary 10% depending on the accessories that are on i.e. lights, stereo, AC, wipers, heater, brake
lights and even directional signals. The BOOST-A-PUMP immediately compensates for any subsequent voltage drop and fuel output reduction.
In fact, the BOOST-A-PUMP will maintain the +50% output as low as 9 volts! Yes, you can also use it on the ignition system to either increase or
maintain the desired voltage if bypassing or eliminating the charging system.
TECHNICAL
BACKGROUND
Kenne Bell has 37 years of background experience in hydraulic engineering. We know fuel systems. The Kenne Bell fuel flow bench is second to
none. We have documented the flow capacities of various fuel line types and sizes, tested all the currently available pumps (stand alone, inline
booster and in tank), regulators, fuel rails, mass air meters and filters. Countless dyno tests have been conducted on our in house dyno with a
variety of fuel system combinations. Fuel pressure and flow and air fuel ratio were measured with our computerized data logger system. The
BOOST-A-PUMP is the latest on the long list of Kenne Bell innovations.Read the following technical information. It will help you to better understand the dynamics offuel flow and pressure.
FLOWvs.
PRESSURE
First of all, pressure - not volume - is the most important indicator. A fuel injector with the proper pressure will flow the necessary fuel (volume). If it
doesn't have the correct pressure, only THEN do you become concerned about volume. Study the pump flow graph in our literature and you will
notice that as flow increases - pressure decreases. Conversely as flow (volume) decreases, pressure increases. Never forget that and it will help
you better understand the relationship between pumps, injectors, regulators, fuel lines, FMU/FMB's etc. EXAMPLE: (See Pump Flow Graph in
literature). Apump flows 88Lat40 psi. What is the flow at 50 psi? Answer: 78Lat50 psi. Whatis the flow at 30 psi? Answer: 97Lat 30 psi. You need
132Lat40 psi. Can't make it with the 88L.Add a Kenne Bell BOOST-A-PUMPto
the 88Lstock pump and you have it.
INSTALLATION
Installation is easy and straight forward. The BOOST-A-PUMP splices into the existing hot (+) fuel pump wire and increases the voltage to the
pump (see STEPS 1 - 3). Connect to the red wires as shown. The black wires are the grounds. There is a cable that connects to the Cockpit
Controller and a cable that connects to the Vacuum/Boost switch.
KB89066 VACUUM SWITCH ACTIVATION
(NORMALLY A SPIRA TED ONL Y)
For non-supercharged applications, the cable connects to a vacuum switch (normally aspirated) and activates at WOT (wide open throttle) and
low vacuum (approx. 4"). Depending on how efficient your intake system is (ideal vacuum gauge reading at WOT is 0") indicating "0" or no
restriction thru the filter, hoses, throttle body and intake manifold. 2", 3", 4", 6" etc. represent varying degrees of restriction, 6" being highly
restrictive. NOTE: The vacuum switch is adjustable. To alter setting tee in a vacuum gauge between the switch and an open hose. Suck on the
other end of the hose. You can typically register up to 10" of vacuum. Watch the gauge needle. You will hear the switch "click." The "click" is the
contacts closing that activate the BOOST-A-PUMP.
KB89067 PRESSURE SWITCH ACTIVATION (SUPERCHARGED
On supercharged or turbocharged applications,
(cost$10).
OR TURBOCHARGED
the pressure switch activates the BOOST-A-PUMP
ONL Y)
at approx. 3.5 psi. There is an optional 5 psi
FMU I FMBAPPLICATION
FMU/FMB (fuel mangagement units or boosters) are supplied with all Kenne Bell, Vortech, Paxton, ATI, Wheeler/SVO and B&M, BBK supercharger kits. These valves are installed in the fuel return line and merely restrict or shut off this line and increase fuel pressure thereby diverting
more fuel thru the injectors. NOTE: Our dyno testing has determined that these FMU/FMB devices increase fuel pressure as boost increases.
Example: Mustangs with stock intank pump and 241b injectors 48 psi with boost reference. An FMU raises the pressure to 55 psi "fixed." An inline
pump raises pressure to 90 psi "fixed" and the injectors go sonic and lock. Better approach would have been the stock pump and FMU at 55 psi.
BOOST-A-PUMP would allow pressure to be fully adjustable between 55 to 90 psi for ideal air fuel ratio and maximum horsepower. CAUTION:
Typically an FMU raises fuel pressure 10 psi for every 1 psi of boost IFthe pump has the capacity.
INLINE BOOSTER PUMPS (WITH FMU I FMB)
Therefore, we do not recommend inline "booster" pumps with any FMU/FMB system. 1.) They can increase fuel pressure to dangerous levels. 2.)
There is no pump flow adjustment. Fuel and pressure are FIXED and cannot be adjusted. 3.) Some injectors go "sonic" or "lock up" at higher
pressures negating control by the computer. 4.) "Inline" pumps are noisy. Inline stand alone high capacity pumps are acceptable but be careful of
big inline pumps with the FMU/FMB. Remember, the injectors must be capable of supplying or passing all this additional fuel volume into the
engine or the pressure will increase to alarming levels. Larger injectors (increases pump volume and decreases pressure) and or eliminating thaFMU/FMB (allows increased fuel volume thru the return line so lowers pressure) or a smaller pump with a Kenne Bell BOOST-A-PUMP will redu
and better control this pressure because of the adjustability.
<c;>
r
072607
PAGE 5 of 5
INLINE PUMPS (WITHOUT FMUlFMB)
Inline pumps that do not utilize an FMU are typically not a problem as most fuel regulators have the flow capacity to bypass the fuel not used by the
injectors back to the tank via the return line. Two (big) stand alone pumps may flow more fuel at idle than the regulator can bypass. An abnormally
high idle pressure that cannot be lowered with adjustment indicates this condition exists. Here again the preferred set up is one (1) big pump and
'BOOST-A-PUMP triggered by a switch that eliminates all that high volume at idle.
FUEL TEMPERATURE
There is one other consideration - fuel temperature. The more fuel the pump discharges the higher the fuel temperature. An inline booster pump
that is activated full time forces all the excess fuel flow thru the regulator and return line heating the fuel in the process. Yet another reason the
Kenne Bell BOOST-A-PU MP activated by a pressure switch is the preferred set up.
REGULATORS
Kenne Bell was the first to manufacture a true billet aluminum adjustable regulator. The SyclonelTyphoon,
Buick Turbo V6's and many other
vehicles do not use the FMUlFMB's. Standard equipmentforthese
vehicles is an adjustable pressure regulator. Set the idle with vacuum hose on.
Pressure will increase 8 psi at 0 vacuum and increase proportionally with boost. Example #1.30 psi idle, 38 psi at 0 vacuum and 48 psi at 10 psi
boost. Example#2. 40 psi idle, 48 psi atO and 58 psi at 10 psi boost- or68 psi at20 psi boost. These numbers are attainable only if the regulator is
boost referenced (vacuum line connected). If the vacuum line is not connected, expect 8 psi more at idle, the same at 0 vacuum and minus the
boost psi at
On naturally aspirated applications removing the vacuum line does not affect WOT fuel pressure - only idle pressure by 8 psi.
Turbocharged or supercharged engines can experiment with an airfuel ratio by varying WOT pressure with this vacuum line. 8 psi can result in up
to .6AF/R variances.
war.
FORD FUEL PRESSURE
DO IT WITH A CHIP
Ford pressure regulators work best at stock pressure (30 psi with vacuum line on). No, this is not a misprint. The EEC looks at both the idle and
WOT fuel tables to adjust fuel. Therefore increasing fuel pressure helps only temporarily - until the EEC sets WOT fuel based on idle pressure. It
begins adjusting both back to the pre set air fuel ratio programmed in the EEC orthe Kenne Bell SWITCH CHIP program. However, at some point,
as pressure is increased, the EEC is unable to "trim" back the rich mixture at idle and WOT. Then again, if idle remains at the stock 30 psi setting
WOT pressure can be increased and the mixture richened without the EEC trimming either. That is the principle behind the FMU/FMB on all
supercharger kits currenly available. Emissions are not affected as the richening only occurs at
The best approach is to control air fuel ratio
with a Kenne Bell SWITCH CHIP or a stand alone system, such as the OFI. The Kenne Bell SWITCH CHIP does not alter air fuel ratio at idle, part
tt,rottle etc. -onlyWOT.And NEVER try to "adjust out" idle up and down surge with the idle screw. The airfuel ratio at idle is OFF (excessively lean
tch) if the engine is "hunting." It's trying to adjust for a poorly calibrated idle mixture. Lower the pressure at idle to 30 psi and back off the idle
~rew
to the factory setting. Slight adjustments may be made without adverse effects.
war.
SPEED DENSITY
Speed Density System Ford cars and trucks use pre-mapped fuel tables in both open and closed loop so raising fuel pressure is sensitive as
compared to the Mass Air Systems which rely on air flow (mass) to calibrate fuel delivery. Therefore, the Kenne Bell BOOST-A-PUMP is an ideal
approach for both naturally aspirated and supercharged vehicles (with and without FMU/FMB). Because of it's less sophisticated computer, the
Syclone/T yphoon Speed Density System is not as sensitive to idle pressure.
EMISSIONS
Since the Kenne Bell BOOST-A-PUMP is only activated at WOT (open loop) fuel pressure at idle and part throttle cannot possibly be affected on
any vehicle. Even if activated full time at maximum 50% increase we have not seen evidence of elevated fuel pressure on any of the vehicles
we've tested. Nevertheless, 50 State Legal Status has been applied for.
FUEL PRESSURE
GAUGE
- GET ONE!
,
You can't determine engine RPM without a tach. You can't determine engine temperature without a temperature guage. You can't determine boost
without a boost gauge. And there is certainly no way you can determine fuel pressure without a fuel pressure gauge. GET ONE. One cannot tune
and trouble shoot a fuel injected car without a fuel pressure gauge.
TROUBLESHOOTING
BOOST·A·PUMP DOESN'T ACTIVATE
Check all wire connections
Check ground. MUST BE GOOD GROUND CONNECTION.
Faulty pressure switch. Bypass the switch by connecting the two wires together (short together - there is no voltage on this circuit)
DO NOT GROUND THESE WIRES. Now check the red OUTPUT + wire and GROUND with a VOM. Turn Cockpit Control to MAX.
Voltage should read at least 16 volts.
Check for blown fuse. See inlinefuse in red INPUT + wire (carry a spare with you at all times).
~OOST·A·PUMP CYCLES "ON" & "OFF"
'----'Built-in internal circuit breaker (separate from the fuse) in BOOST-A-PUMP
rating is 15amps (maximum peak20 amps, 40 amps for-2 Models).
module is being triggered because of overload. Operating
r 183118218
Hi Tech Performance
ALTERNATE
Products
INSTRUCTIONS
FOR RUNNING
BOOST.A·PUMp™
OLD FUEL
PUMP RELAY
1'"::8-=7-a------I
BATTERY
I
OLD WIRE TO
FUEL PUMP
(CUT AND USE TO
RUN COIL OF NEW
RELAY)
~
86
+
-
••
.
NEW
30 AMP
FUSE
{~EMOVEI
=-
~
INPUT
BAP
.,
TO
FUEL
PUMP
·"0
I
IOUTPUT
NEW FUEL
PUMP RELAY
(30AMP
MINIMUM)'
-
-
,
-
10743 Bell Ct. Rancho Cucamonga,
Orders (909) 941-6646 Tech (909) 941-0985
'\
I
30-87a
NEW
10 or 12
AWG WIRE
NEW WIRING
r
CA 91730
Fax (909) 944-4883
(
I
BOOST·A·PUMP Supplement for '03 Cobra
To be used with BAP instructions.
See general BAP instructions included with BAP for specific installation.
This page is meant as an overview explaining where to mount the BAP and exactly which wire to tap into.
BAP SETTING
Set BAP controller based on supercharger pulley size.
NOTE: If you have a larger crank pulley than stock, use the
pulley ratio or peak boost into engine.
PULLEY SIZE / BOOST / PULLEY RATIO
r.-&".~..,,·
I
I .. - .
o·
.
UI$V~"
"-:~~~.'~.'
0
Ratio
Boost
9
11
13
15
17
20%
4"
1.87
25%
3-314"
2.00
30%
35%
3-1/2"
40%
3"
2.14
2.3
2.51
L_ ~~~_.
3-1/4"
~:~~~;__
Fuel
pump
control
module.
.. ' .. ..
I;'_3 .._~~ J
.,, __
Fuel psi at wide open throttle should be 85 psi at 6500RPM.
1 . The BAP will be mounted in the trunk behind plastic/felt insulation, remove this to gain access for insulation.
Pay attention and don't drill through the fender when drilling hole for BAP.
2. There is a wire loom leading to fuel pump control module, slice, tape and pull back loom.
~
3. Locate brown wire with pink stripe coming from fuel pump control module, this is the wire leading directly
to the twin intake pumps. Cut this wire approximately 2-3 inches from connector.
4. Install heat shrink on red fused wire of BAP (input) splice to wire coming from fuel pump control
solder wires and heat shrink.
module,
5. Splice, solder, and heat shrink non-fused output wire from BAP to brown with pink wire leading to pump.
6. Install ground lug on black ground wire and attach chassisground location in fender well. Close to fuel pump
control module. Be sure to solder ground lug to insure against corrosion.
7. Run controller wire to desired location and mount control box. Shown installed in trunk, this is a nice place
to mount it. (no one can re-adjust your fuel by accident)
8. Run switch wire through car inside under plastic lower trim panel to engine compartment.
9. Hook switch wire to boost switch and tee into boost line leading to fuel pressure sensor from discharge
manifold.
1 O. Replace stock 20A fuse inn power distribution center (under hood) with 30A for fuel pump. Refer to owners
manual for correct fuse location.
"--- 11. Overall this makes for a very clean installation. Ziptie all loose wires. Re-Ioom fuel pump control module and
tape up with electrical tape.
12. Set BAP controller according to the table above.
Page 40 of 43
BOOST-A-PUMP Instructions for 199 and up Mustang GT
This page is meant as an overview explaining where to mount the BAP and exactly which wire to tap into.
FIGURE 1
FIGURE
2
NEVER EXCEED 75 PSI AT WIDE OPEN THROTTLE.
1. The BAP will be mounted in the trunk behind plastic/felt insulation, remove this to gain access for insulation.
Pay attention and don't drill through the fender when drilling hole for BAP. See figure I.
2. There is a wire loom leading to the roll over switch, slice and tape back.
3. Locate pink wire with black stripe coming from roll over switch. Cut this wire approximately
from connector. See figure 2.
2-3 inches
I
tfU-'tf' 'J'i/ "\ ~\\ovl
-::>
4. Install heat shrink on red fused wire of BAP (input) splice to wire coming from roll over switch, solder wires
and heat shrink.
5. Splice, solder, and heat shrink non-fused output wire from BAP to pink with black stripe wire.
6. Install ground lug on black ground wire and attach chassis ground location in fender well. Close to fuel pump
control module. Be sure to solder ground lug to insure against corrosion.
7. Run switch cabling (black/red wires) through car inside under plastic lower trim panel to engine
compartment.
8. Connect switch wires (black/red - polarity does not matter) to boost switch and tee into boost line leading
to Fuel Rail Pressure Sensor from discharge manifold.
TO FUEL RAIL PRESSURE
SENSOR BOOST
LINE.
(TAP INTO LINE
WITH TEE)
vacuu~~lrc~ssure
..-m{lP-------
TO BAP IN TRUNK
9. Overall this makes for a very clean installation. Ziptie all loose wires. Tape up with electrical tape.
Page 101 of 104
R072704
6E3-A-18
4.3L TURBO (VIN Z) DRIVEABILlTY,AND EMISSIONS
TO IGNITION
SWITCH
...I
~
FIPFUSE
o
o
~440rOcRN
ECM
4400R.~D
1
A
C201
~4~-----31TAN----~
~
A
GRNIWHT 465
t
FUELPUMP
RELAY
BLKlWHT 450
B+
RELAY DRIVE
~-~
BA11
BA12
FUEL PUMP RELAY
HARNESS
CONNECTOR
CHART A-S
Circu it Description:
FUEL PUMP RELAY CIRCUIT
4.3L TURBO (VIN Z) SYCLONE AND
TYPHOON (PORT)
When the ignition switch is turned "ON ,n the Electronic Control Module (ECM) will activate the fuel pump
relay and run the in-tank fuel pump. The fuel pump will operate as long as the engine is cranking or running
and the ECM is receiving ignition reference pulses.
If there are no reference pulses, the ECM will shut "OFF" the fuel pump within 2 seconds after key "ON."
Should the fuel pump relay or the 12V relay drive from the ECM fail, the fuel pump will be run through an .
oil pressure switch back-up circuit.
Test Description:
Numbers below refer to circled
numbers on the diagnostic chart.
1. This test will determine if the oil pressure switch
is closing and supplying voltage to the fuel pump
when the relay is not functioning.
2. This test will determine if the oil pressure switch
is stuck open.
Diagnostic Aids:
An inoperative fuel' pump relay can result in long
cranking times, particularly if the engine is cold or
engine oil pressure is low. The extended crank period
is caused by the time necessary for oil pressure to
build enough to close the oil pressure switch and turn
"ON" the fuel pump.
-,
Bussed Electrical
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