1994 Geo Prizm Base, StandardFACTORY 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) 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 terminals 12/B+ (Black/Red wire) and 1/FP (Blue/Black wire), located on left strut tower.
(4) With engine at idle, pressure regulator vacuum hose disconnected and plugged, pressure is 31-37 psi (2.2-2.6 kg/cm2 ).
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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.