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Published on Friday, Jul 03, 2009
Q: My car has a problem that causes the check engine light to be on all the time. My repair shop said it's caused by a leak somewhere around the fuel tank but no one can seem to find it. The shop replaced the gas cap and a valve of some kind but the problem continues.
A: It sounds like your car's OBD-II system has identified a difficult-to-fix EVAP system leak.
All cars and light trucks since the 1970s are equipped with an evaporative emissions control system (EVAP).
Fuel vapors from the fuel tank and carburetor (in earlier vehicles) are collected and stored in a canister containing charcoal granules.
When the vehicle is driven, under appropriate conditions, the system purges the stored vapors.
Modern vehicles regularly test the fuel tank, canister and related EVAP system.
In most cases a sharp technician should be able track down the source of your leak.
Q: My car has a problem that causes the check engine light to be on all the time. My repair shop said it's caused by a leak somewhere around the fuel tank but no one can seem to find it. The shop replaced the gas cap and a valve of some kind but the problem continues.
Get the full article here.
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