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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 862 (ENGINE CONTROLS - 6.5L - TROUBLESHOOTING)FUEL SYSTEM DIAGNOSISFUEL LIFT PUMP SUCTION LINE CHECK
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Fuel Lift Pump Suction Line Check
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Fuel Lift Pump Suction Line Check
WARNING: This page is about a different car, the 2001 GMC C3500 HD and 2001 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the fuel tank cap and repeat the Lift Pump Flow Check.
- If the flow is more than 0.24 liter (1/2 pint) in 15 seconds, replace the defective fuel tank cap.
- If the flow is less than 0.24 liter (1/2 pint) in 15 seconds, proceed to the next step.
- Separate the lift pump suction line from the fuel sender.
- Connect the suction line to a source of clean fuel by using an additional hose.
- Repeat the Lift Pump Flow Check.
- If the flow is more than 0.24 liter (1/2 pint) in 15 seconds, proceed to Fuel System Air Leak Check.
- If the flow is less than 0.24 liter (1/2 pint) in 15 seconds, proceed to Step 5.
- Check the lift pump suction line for a restriction.
- If a restriction exists, repair the restriction and recheck lift pump flow.
- If no restriction exists, replace the lift pump and recheck the lift pump flow. Refer to Fuel Pump Electrical Circuit Diagnosis .
- Attach the lift pump suction line to the fuel sender.
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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.