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Old 08-05-2006, 12:09 AM
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Smells like gas

Ok I know this isn't a true hot rod question but I'm doin it anyway.

My sister in law has an 83 F150 ford with a 302 /auto. She called me and said it smells like gas in the cab.

There is no tank behind the seat. There are 2 tanks, 1 saddle tank on the drivers side frame and one in the back behind the axle. There is an electric tank selector valve somewhere under the truck. Both filler necks are in the bed.
There are no obvious leaks. She has already gotten under the truck and looked all around, and can't find anything . She is fairly handy and observant, so I know she would see something obvious.

I can't get to the truck to look at it because it is 200 miles away, in Jackson, Ca. I have no familiarity with this truck either.
I would tell her to take it to a shop, but things are kind of tight for her.

I suggested following all the lines, from tank to pump, and maybe she would find something.Could the fuel vent system have something in it, like a purge canister, that could be leaking?

Does anyone have any ideas?

Thanks for reading this,

Mikey

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Old 08-05-2006, 03:38 AM
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If the charcoal cannister is full/blocked (like oxy sensors they do have a service life) then the only way for the float bowl to vent is into the engine or through vacuum lines and possibly the brake booster (which vents into the cab).
Usually a blocked cannister gives a hard cold start as the lack of a vent pushes the fuel through the main jets till the bowl is empty. This makes it fire then die on cranking until the bowl fills again.
If the cab has fresh air vents at the rear and a bad vent in the bed then vapours could enter the cab.
I'd temporarilly disconnect the cannister (illegal!) to see if this helps, if not then PARK IT until she can afford help. Fuel leaks and people are a bad mix.
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Old 08-05-2006, 08:29 AM
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It could be anything leaking under the hood. Is it injected? Does it only happen on start up? If so it is probably a slow leak from an injector or cracked hose. I have a friend that recently almost lost his car due to a cracked hose that connects the fuel rails. That car always had a faint smell of gas on start up. Eventually the hose got worse and the car caught fire.
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Old 08-05-2006, 09:22 AM
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Thanks guys
It's carburated, and she had actually asked me if the canister could be the source. I never knew that they had a service life. I will have her remove the vent hose for a bit and see what happens. I believe it smells faintly like gas all the time.
Thanks for the replies
mikey
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