Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987STEP VAN P20, 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL PUMP - ELECTRICCOMPONENT TESTINGFUEL PUMP FLOW TEST
1987 Chevrolet Step Van P20, 6.2 J, Standard
Fuel Pump Flow Test
1987 Chevrolet Step Van P20, 6.2 J, StandardSECTION Fuel Pump Flow Test
- Relieve fuel system pressure by removing "FUEL PUMP" fuse from fuse block. Crank engine. Engine will start and run until residual fuel in lines is used. After engine stops, crank engine an additional 3 seconds to relieve any remaining pressure. Turn ignition off and install fuel pump fuse.
- Connect a fuel hose to throttle body feed line. Route line to a one quart, calibrated container. Apply battery voltage to terminal "G" of Assembly Line Communications Link (ALCL). See Fig 1. Fuel pump should supply 1/2 pint (240 ml) or more of fuel in 15 seconds.
- If fuel supply is within specifications, pump is operating properly. If fuel supply is less than specifications, check for restrictions in supply line. Repair or replace line if necessary. If there are no restrictions, perform FUEL PUMP PRESSURE TEST .
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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.