I have a strong gas smell with the in cab gas tank on my '56 F100. The tank appears to be dry and I can't see any place that looks like it might be leaking, any suggestions?

 

usually the bung where fuel line connects to tank rots and leaks. might be just enough to allow vapors but not wet. could also be sending unit gasket shot. possibly bottom of tank is rusting?

 

Did the smell occur after filling the tank full? When the tank is topped off, the cork gasket between the sending unit and tank will saturate with fuel, causing a fuel smell in the cab. The same will also occur throughout the day, if the tank is nearly full, as the fuel expands with the rising temperature. The fix...don't fill the tank to the filler neck rim or replace the cork gasket with the newer rubber replacement.

 

Thanks for the input, the fuel sender is dry with the tank full or low...still smells.(has a new neoprene gasket) The bottom of the tank is clean and dry, this is a New Mexico truck, no rust.
I have put a Hagan's gas door on the cab and it has a cap that has an "o" ring seal and one of those flap doors that don't need the cap removed to fill the tank.
I would like to ad pics to my post but the rules indicate that I my not.
Well, thanks again and if anyone thinks of something i will appreciate it, Buford

 

Did you check the rubber tube between the tank and filler neck, could be the clamps need tightening or a new rubber tube, is there a vent tube that may need to be vented to the outside?

 

Yup, the hose for the fill is new and nice, the clamps are tight and the vent hose is attached from the top of the tank to the fill pipe near the top of the filler pipe.. (outside) I will just keep looking, this has me baffled.

 

Southwind gas heater in cab? Fuel pump ,carb leaking?

 

Nope, no gas heater...fuel pump is in line (Nisson) under the cab,(dry) engine is a 5.4 with fuel injection...no visable leaks there.