Gas Cap Loose Warning Light

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Apr 21, 2004 | 05:43 PM

ausbeer62

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Gas Cap Loose Warning Light

I searched the forums and didn't see anything on this. My 2003 F-150 Club Cab has a warning light for a loose gas cap that has come on. It's not a loose cap. I even replaced the cap with a new one with no help. At least the light didn't go off, I assume it'll turn itself off. It's a rebuilt truck and some flooding to front end.

I assume for some reason it's not building up sufficient vacuum in the tank. Maybe a loose breather hose or something about the filler neck maybe??

Is there anything I should look for before I take it to the dealer?

Apr 22, 2004 | 03:45 AM

Ford_Six

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From: The Big, Oregon

If you just got it, I'd take it back. These things can take a while to chase down.

Apr 22, 2004 | 09:46 AM

oldhalftons

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From: Spokane WA

Quote:

Originally Posted by ausbeer62

I even replaced the cap with a new one with no help. At least the light didn't go off, I assume it'll turn itself off. It's a rebuilt truck and some flooding to front end.

take it back. and run away

If the front end was flooded, it could be anything in the vapor/fuel return system, and could turn into $$$$$$ in diagnostic time.

most places will not pass it during an emission test

Apr 22, 2004 | 05:55 PM

ausbeer62

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It was bought rebuilt so there's no warranty. I'm going to have to chase this down myself or have the dealer do so. Any suggestions?

Apr 24, 2004 | 04:28 AM

Ford_Six

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From: The Big, Oregon

Start by disconnecting the battery for about 30 seconds. If the light doesn't come back on, then the problem is fixed. From there, check the vapor lines. I believe on this year truck the vapor cannister is right near the gas tank, so check that too. A dealership or high-tech garage will have special equipment for checking these systems, that fills the gas tank with smoke, making any vapor leaks very visible. Just as a side note, don't try to fill the tank with smoke yourself.

Apr 24, 2004 | 02:13 PM

ausbeer62

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Thanks. Isn't there a trick to disconnecting the battery so that it doesn't mess up your key programming? Maybe disconnect the negative first, or is it the other way around?