The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Reconfiguring fuel tank vent

Tired of smelling gas fumes from my in-cab tank. Would like to convert filler neck to a non-vented cap with a remote vent tube. I've searched throught 450 posts with plenty of opinions regarding relocating tank altogether; I'm not interested in that as I use the space between the rear frame rails for my spare tire. I'm sure someone has done this before and I need guidance as to engineering and safety.

If the filler neck clamps & filler neck rubber hose are properly secured and in good-order, you will not have any fuel fumes in the cab. Have you corrected any issues you may have with these items or checked to see if the tank is leaking anywhere? I have corrected these issues on may factory in-cab fuel tanks over the years and the results were a fume-free cab, without the extra cost of relocating the tank, to the rear frame rails.

Let me clarify. The fumes are not emminating in the cab they are wafting in through my window as they vent throught the filler cap. That is why I want to change to a non-vented cap, but I realize that I then need to vent the tank some other way.

Ave - you'd have to 'remote' the vent at a level above the top of the tank, which would kinda require making a new hole in the body at that level .... not sure why you'd be smelling fumes from the cap vent, it's only a pin hole and should be drawing air in as fuel level goes down, not 'venting' fumes out - I'd suspect that the rubber vent connection inside the cab is old cracked rubber, or as Tony says, the joints/clamps are loose or you have a pin hole weeping under the tank

Bill

Nothing like the hot Florida Sun to make those gas fumes pure out of the cap. That’s why being a Florida Boy I installed A/C and I roll up the windows on the hot days……

Inside the cab all the rubber is new and tight, but I have an old locking gas cap with a not-so-tight fit. I had figured on looping the new vent hose to be higher than the tank, but then exiting through the floor, via a ball-check vent tube.

Replacing the cap with one that seals properly will correct the problem.

"I have an old locking gas cap with a not-so-tight fit"

Seems it would be a whole lot easier to change the gas cap. On real hot days I'll get a slight gas smell outside the cab. Especially if the windows have been up and its been sitting a while in the sun where the cab temp is pushing 130+. But if your getting real strong smells its time to change that cap. A new non-locking cap will run you less than $10 at your local parts store.

Alright, I'll go with you. I'll change the cap, definately the easiest to do. I'll report back in a couple of weeks. Thanks.

If you have any original rubber (or anything pre-about 1990) in your fuel system, it will be susceptible to Ethanol deterioration. The rubber filler extension and the rubber hose at at the bottom of the tank should be replaced with modern rubber compounds. If you really get hung up on venting, you could rig up a system to vent the tank through the front passenger stake pocket in the bed.

Good call on that. Nothing like the original system.