Fuel system check
Warning: Certain precautions should be observed when inspecting or servicing the fuel system components. Work in a well-ventilated area and do not allow open flames (cigarettes, appliance pilot lights, etc.) near the work area. Mop up spills immediately and do not store fuel-soaked rags where they could ignite. It is a good idea to keep a dry chemical (Class B) fire extinguisher near the work area any time the fuel system is being serviced.
1. If you smell fuel while driving or after the vehicle has been sitting in the sun, inspect the fuel system immediately.
2. Remove the fuel filler cap and inspect if for damage and corrosion. The gasket should have an unbroken sealing imprint. If the gasket is damaged, remove it and install a new one (see Fuel tank cap gasket inspection and replacement).
3. Inspect the fuel feed and return lines for cracks. Make sure that the threaded flare nut type connectors (which secure the metal
fuel lines to the fuel injection system) and the banjo bolts (which secure the banjo fittings to the in-line fuel filter) are tight.
4. Since some components of the fuel system — the fuel tank and part of the fuel feed line, for example — are underneath the vehicle, they can be inspected more easily with the vehicle raised on a hoist. If that’s not possible, raise the vehicle and support it securely on jack stands.
5. With the vehicle raised and safely sup- ported, inspect the fuel tank and filler neck for punctures, cracks and other damage. The connection between the filler neck and the tank is particularly critical. Sometimes a rubber filler neck will leak because of loose clamps or deteriorated rubber. These are problems a home mechanic can usually rectify.
Warning: Do not, under any circumstances, try to repair a fuel tank (except rubber components). A welding torch or any open flame can easily cause fuel vapors inside the tank to explode.
6. Carefully check all rubber hoses and metal lines leading away from the fuel tank. Check for loose connections, deteriorated hoses, crimped lines and other damage. Carefully inspect the lines from the tank to the fuel injection system. Repair or replace damaged sections as necessary (see Fuel and exhaust systems).