I have a check engine light because of the fuel cap. To turn it off do i just have to get a new cap or is there something else i can do to fix it?

 

If it is the cap replace it.

Some codes will clear once the problem is fixed, others must complete so many good "trips."

An evap leak should clear the CEL when the problem is fixed.

The code will clear from the PCM memory after 40 trips.

 

Start with the cheap stuff first. New gas cap.

 

will do thanks guys

 

There can be lots of different reasons for a small evap leak code. Often the gas cap can be the problem, but it could also be a cracked evap system hose, failed leak detection pump, a bad charcoal canister down by the gas tank or several other causes. Start with the cheapest and most simple fixes first. Try a new gas cap and the parts store guys might use a pocket code reader to clear the code and turn off the CEL for you. Drive the truck a few days and if the cap really was the problem, the CEL should not come back on. If there is some other cause of the problem, you should get a CEL again with probably the same code within a day or two.

If all else fails it might be worth it to get a smoke test done at most any good garage. They hook up a machine that injects smoke to the evap system and the smoke will trail out of the location or part where the leak is. Kind of like putting a flat tire in water to let the air bubbles show you where the hole is.

Jimmy

 

Thanks man helps a lot. appreciate it

 

To clear the small evap leak code I had to replace the fuel filler neck. It's the piece the gas cap screws into. I think it cost me about 60 bucks online and took 20min to replace. Real easy to get under the truck with a flashlight and see how corroded it is, mine actually broke while trying to get one of the hose clamps off because it was so rusty.. gotta love salty winters