Fuel Pump - Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual

NOTE: Each time the fuel pressure is adjusted, the fueling maps must be retuned. Failure to retune may cause poor fuel
economy, rich or lean misfire or engine damage.
DANGER! INCREASING THE FUEL PRESSURE BEYOND THE OPERATING POINT OF THE FUEL PUMP MAY
RESULTS IN POOR ENGINE PERFORMANCE AND COULD CAUSE FUEL LEAKAGE ON COMPONENTS
THAT ARE NOT RATED FOR EXCESSIVE HIGH FUEL PRESSURES. LEAKAGE OR BURSTING OF FUEL
SYSTEM COMPONENTS MAY RESULT IN A FIRE OR EXPLOSION HAZARD WHICH COULD CAUSE
SERIOUS INJURY OR DEATH.

10.3 Fuel Pump

DANGER! NEVER GET UNDER A VEHICLE SUPPORTED ONLY BY A JACK. SERIOUS INJURY OR DEATH CAN
RESULT FROM VEHICLES FALLING OFF OF JACKS. BEFORE WORKING UNDERNEATH A VEHICLE,
SUPPORT SOLIDLY WITH JACK STANDS.
The MPI PRO-JECTION fuel pump is a high quality pump that supplies at least 45 gph at 300kPa (43.5psi). The high-pressure
fuel pump has limited suction characteristics so it needs to be mounted as low as possible and should be mounted no higher
than the top of the fuel tank. The pump can be mounted either horizontally or vertically. When mounting the fuel pump, check to
make sure that you have the fuel flow in the correct direction. This may sound like a foolish reminder, but it is a common
installation error. To prevent damage to the fuel pump before the fuel system is filled with fuel, drip/spray some light lubricant
(such as 10w motor oil) into the inlet side of the pump.
1 - Make sure fuel tank is properly vented.
2 - Mount the electric fuel pump as close to the fuel tank outlet as possible with the bracket provided. Mounting the fuel
pump in this manner will insure that the pump will prime easily and purge fuel vapors in the fuel lines to insure faster
starts.
DANGER! TAKE PRECAUTIONS TO ENSURE THAT ALL FUEL LINE ROUTINGS ARE AWAY FROM HEAT SOURCES,
SUCH AS THE ENGINE, CATALITIC CONVERTER OR EXHAUST PIPES. A FIRE OR EXPLOSION HAZARD
COULD CAUSE SERIOUS INJURY OR DEATH.
DANGER! ENSURE THAT THE FUEL PUMP MOUNTING LOCATION WILL NOT INTERFERE WITH ANY UNDER THE
VEHICLE COMPONENTS, ESPECIALLY AT THE EXTREME LIMITS OF THE SUSPENSION TRAVEL. A
FIRE OR EXPLOSION HAZARD COULD CAUSE SERIOUS INJURY OR DEATH.
Figure 3
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