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 MANUALSCHEVROLET1990CHEVY VAN G20, 4.3 Z, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGBASIC FUEL SYSTEM CHECKS (DIESEL)FUEL PUMP FLOW TEST
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40
Fuel Pump Flow Test
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40SECTION Fuel Pump Flow Test
- Disconnect fuel line at fuel filter inlet. Disconnect fuel injection pump electric shut-off solenoid wire (Pink).
- Crank engine for 15 seconds. Fuel pump should supply approximately 1/2 pint of fuel in 15 seconds. If fuel delivery is not as specified, go to FUEL SYSTEM 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.