Fuel Tank Replacement
How are fuel tank issues diagnosed?
When the EVAP system is checked, the purge valve and vent valve are closed, and the pressure is monitored by the fuel tank pressure sensor. If that pressure drops with both valves closed, there is a leak in the EVAP system. If pressure holds properly, the system passes, and will continue to prevent vapor emissions. The sensor is also used in testing vent valve and purge valve operation. When the valves are open, the pressure sensor reads the fuel tank pressure, and must sense a drop in pressure. If not, the purge valve or vent valve may be faulty.
How is a fuel tank replaced?
When the identified component is faulty, the technician will remove all electrical and vacuum connectors, clean the mating surface for the faulty part, and install a new part. The evap system will then be allowed to run self-diagnostics to test the repair. If additional leaks are present, or other components have failed, the test will fail, and the process will restart. To help prevent issues with the EVAP system, especially the charcoal canister, avoid overfilling or topping off the fuel tank.
RepairPal Recommendations for fuel tank issues
To help prevent issues with the EVAP system, especially the charcoal canister, avoid overfilling or topping off the fuel tank. When the tank is topped off, the charcoal canister may fill with fuel, causing degradation of the charcoal canister and system failure.
What to look out for when dealing with fuel tank issues
When working with fuel, the battery should always be disconnected, and proper precautions taken against fire hazards. It is recommended to replace the fuel tank retaining straps if they are corroded or damaged.
Can I replace the fuel tank myself?
Fuel tanks are large, cumbersome, and can be extremely heavy. If the fuel tank must be replaced, a DIYer can handle the repair, but an assistant should be used to prevent injury or damage to the vehicle. The fuel tank combines electricity and fuel, and proper working knowledge of these components, and safety procedures is a must. If you feel that you are unqualified for this task, leave it to a professional technician.