catching a buzz driving the 72...

[tommys72]

and not from drinking and driving. Anyone have some info about these fuel vent lines in the cab? How many? Locations? It smells horribly in the cab, i got a headache in about 8 mins driving earlier. Its about equal to unscrewing the gas cap and smelling straight out of the tank.

Thanks

Tom

[In The Ten Ring]

Your vent hoses may be dry rotted. That is certainly possible.

I replaced all my fuel lines and hoses, let me hit you with some pics. My truck is a 1972 also. All but one of these pics are of my replacement connections but the locations are the same. I suspect it is your vent lines that are leaking.

There is a rubber hose connection between the 3/8 inch line and the fuel sender. This is behind your seat.



This is a fuel line connection from the tank to the fuel line under the cab. Mine is a little different from original but basically the same thing.



Underneath the cab, directly underneath in fact.



This is the vent line that runs (eventually) to the charcoal canister under the hood and beside the battery. This is a direct hose replacement as I reused all my vent lines.



Original vent line hose connection. This is under the passenger floorboard of the cab.




I guess I don't have a pic of this one, not on photobucket anyway. There is a short hose (vent) connection between the tank and the fuel filler nozzle pipe.

Now when I began removing my old fuel and vent lines, ALL of my vent line hose connecting pieces (factory rubber) were cracked. It is conceivable that yours are too since our trucks are the same model year. I'd suggest removing your seat(s),and replacing all of your fuel line and fuel vent line connections. It's really not that hard.....I did it, and I'm pretty much a noob with this sort of thing.

There is a rubber gasket between the fuel sender lock ring and the tank itself. That could be suspect.

Gasoline fumes are nothing to laugh at, breathing such can certainly affect perception and judgment and cause brain damage.

[tommys72]

Outstanding! Thank you very much!

[joeydurango]

Nice pics, Ten Ring. I'll come back to this for reference if I ever need to replace the lines, thanks!

Tommy, just don't let anyone tell you that you have to relocate the tank to fix the problem, because there are plenty of in-cab tanks that have no smell. I've had two with zero fumes issues.

[tommys72]

Im keepi g the tank where it is, i like the factory spot. Ive had this truck over 4 years with no issues. Didnt drive it for about a month and when i did yesterday it had a wicked gas smell that never went aeay. No smells outside, underneath or under hood, just in the cab.