1995 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Pump

FUEL PUMP PERFORMANCE

KOEO (1) psi (kg/cm2 ) Eng. @ Idle psi (kg/cm2 ) (2) Hold Pressure psi (kg/cm2 )
38-44 (2.7-3.1) (3) (4) 38-44 (2.7-3.1) (5) 21 (1.5)
(1) KOEO is ignition on and engine off.
(2) Measured within one minute of engine off and with ignition on.
(3) With ignition on, engine off, and a jumper wire connected between DLC connector terminal No. 12/B+ (Black/Red wire) and terminal No. 1/Fp (Blue/Black wire), located on left strut tower.
(4) With jumper wire removed, engine at idle, and pressure regulator vacuum hose disconnected and plugged. With pressure regulator vacuum hosed connected pressure is 31-37 psi (2.2-2.6 kg/cm2 ).
(5) Pressure should hold at more than specification for at least 5 minutes after engine is turned off.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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