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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONFUEL TANKTESTING AND INSPECTION
1990 Chevrolet Lumina APV V6-191 3.1L
Fuel Tank: Testing and Inspection
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Testing and Inspection
NOTE:
a. When working on or near the fuel tank, be sure to observe information molded on the bottom of the fuel tank.
b. Before removing the fuel tank for a suspected leak, make sure fuel hoses are not leaking onto the tank. Once removed, make sure fuel is not leaking around fuel level meter assembly o-ring.
c. This check requires a fuel level meter assembly and O-ring cap to be installed in the fuel tank.
PROCEDURE
1. Disconnect negative battery terminal.
2. Relieve fuel system pressure. Refer to FUEL PRESSURE RELIEF.
3. Remove fuel tank. Refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES.
4. Cap fuel feed tube and vapor tube on the fuel level meter assembly.
5. Plug vent hose.
6. Connect a piece of hose to the fuel return tube.
7. Submerge tank in water or apply soap solution to the outside of tank.
8. Apply 7 to 10 kPa (1 to 1 1/2 PSI) air pressure to the fuel return tube on the fuel level meter assembly. Air bubbles appearing from the fuel tank indicate a leak. Replace the fuel tank if it is leaking.
a. When working on or near the fuel tank, be sure to observe information molded on the bottom of the fuel tank.
b. Before removing the fuel tank for a suspected leak, make sure fuel hoses are not leaking onto the tank. Once removed, make sure fuel is not leaking around fuel level meter assembly o-ring.
c. This check requires a fuel level meter assembly and O-ring cap to be installed in the fuel tank.
PROCEDURE
1. Disconnect negative battery terminal.
2. Relieve fuel system pressure. Refer to FUEL PRESSURE RELIEF.
3. Remove fuel tank. Refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES.
4. Cap fuel feed tube and vapor tube on the fuel level meter assembly.
5. Plug vent hose.
6. Connect a piece of hose to the fuel return tube.
7. Submerge tank in water or apply soap solution to the outside of tank.
8. Apply 7 to 10 kPa (1 to 1 1/2 PSI) air pressure to the fuel return tube on the fuel level meter assembly. Air bubbles appearing from the fuel tank indicate a leak. Replace the fuel tank if it is leaking.
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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.