Gas fumes in cab
 

Recently acquired a '71 C10 Custom with the gas tank behind the seat. There is a relatively strong gasoline odor in the cab which I obviously want to get fixed IMMEDIATELY! Upon inspection I found old, tired out silicone caulking between the filler neck and the tank. I believe this is the source of the vapor leak. Aside from removing tank and filler neck to have it professionally soldered or braised, it there a product (better than silicone) which I could use to seal the area? I'm thinking something similar to JBWeld or MarineTex but must not be gas permeable.

Thanks!!!

Re: Gas fumes in cab
 

Check both the filler neck and the sending unit gasket. My '71 always use to stink if I filled the tank all of the way. Lucky for me I cant afford to. Make sure you have a vented gas cap so you are replacing the cheap stuff first.

Re: Gas fumes in cab
 

When I first got my truck I had a gas leak as well.. nothing really worked to seal it up and stop the fumes... then i I found out how inexpensive it is to have a new spectre tank shipped to the house. It gave me excuse to replace the fuel lines, sending unit and carpet.. the spectre tank from Rockauto shipped to texas with a 5% discount is $177.78 .. not a bad price for peace of mind of a fresh new tank, Rockauto does offer a few other cheaper tanks but after some research I found that most tanks are made overseas, Spectre tanks are made in canada and fit my truck perfect.. worth the few extra bucks in my book... good luck

Re: Gas fumes in cab
 

Mine smelled until I put sealer on the sending unit screws as well. The gasket sealed, but the screws weeped... No smell now. Worked for me.

Re: Gas fumes in cab
 

Mine had the sending unit gasket/or ing leaking. Replaced it and the retainer ring. Problem was solved. But I failed to realize the PO before had used a non vented cap so it started back up leaking again. Replaced the cap and the sending unit quit leaking. Seems fine now. Been about 3 months without any more issues.

Re: Gas fumes in cab
 

my 71 had a strong smell of fuel when I purchased it so I pulled the tank out and found heaps of pin holes in the bottom of tank. Had just started to rust through so replaced with a new one and problem solved:metal:

Re: Gas fumes in cab
 

I'm glad to see this thread. I ordered a new seal a couple of weeks ago. No I have some other things to look at while I'm working on this.