Gas cap light on and code
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More Turbo
Joined: Nov 2004
Posts: 515
Likes: 6
From: Denver, NC
Gas cap light on and code
04 F250 5.4, so the gas cap light came on a few weeks ago. I checked the cap and it was tight. I cleared the light and then it came back on and the check engine light came on with code P0455. Looked it up and said EVAP leak. readr some threads about the code and checked a few things. Gas cap gasket looks good and the filler neck rim is clean. Was looking for a broken or loose hose but did not find anything. Should I just get a new gas cap before replacing the purge valve? Do not want to just throw money into new parts if it is not needed. Any suggestion ? All; lights are off right now but the engine started to run rough tonight. Thank you
Fleet Mechanic
Joined: Oct 2017
Posts: 1,704
Likes: 164
From: Southwest Ohio
It's never the gas cap. You probably have a failed purge solenoid, as it's a moving part and is a common failure on all makes and models of cars.
If you do not know how to replace this part, a mechanic will easily be able to resolve this for you at not too steep of a price.
-- Dave
If you do not know how to replace this part, a mechanic will easily be able to resolve this for you at not too steep of a price.
-- Dave
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Should I just get a new gas cap before replacing the purge valve? Do not want to just throw money into new parts if it is not needed.
Here's the list of suspects per the PC/ED:
There is a way to test the gas cap without any gear, but it's kind of gross. You stick the small end in your mouth, seal it with your lips and see if you can draw or blow air through it. It shouldn't pass air in either direction.
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