gas tank

mexbearlll · Post by **mexbearlll** » June 18, 2008, 6:37 am

I continue to get pressure build up in gas tank no matter how much i have in it. Anybody have cure for this ??

36truck · Post by **36truck** » June 18, 2008, 7:45 am

Vented gas cap.

mexbearlll · Post by **mexbearlll** » June 18, 2008, 9:35 am

do they make locking ones that vent

ras4434 · Post by **ras4434** » June 18, 2008, 10:18 am

I bought a locking cap from Dennis Carpenter that is vented and have no problems.

blackagatha · Post by **blackagatha** » June 19, 2008, 4:10 am

every vented gas cap I have ever owned/seen is vented inward so there is no vacuum/ fuel starvation, but they ALL make pressure build up.

Maybe you people with no problems are in cooler climates? it gets bad for me when it's hot out... in the summer, sometimes I hear it blow off a long loud squeal when the seal cuts loose when there is too much pressure.

stronger66ratfink · Post by **stronger66ratfink** » June 19, 2008, 7:09 am

I made a bad mistake this week end, here in land of the upper 90's
after the car show Sunday, filled the tank which I don't usually top it off but did this time, took the truck home, a few blocks and parked her in the garage, everyone kept telling me they smelt gas but I could not find any leaks until last night when it was brought up again, looked the gas cap and filler nosel and noticed something I wished never to see!
seems the heat had helped expand the volume and was over flow was being pushed back out the cap, slowly working the paint up around the base of the nosel, quickly soaked some out of the tank and ran the truck for about 30 minutes but the damage is done! thank god it stop at the nosel and didn't work the red out below. Don't fill the tank if your not driving it every day! I'll be trying to work the magic with the touch up brush tonite.

cdherman · Post by **cdherman** » June 19, 2008, 5:48 pm

stronger66ratfink wrote:I made a bad mistake this week end, here in land of the upper 90's
after the car show Sunday, filled the tank which I don't usually top it off but did this time, took the truck home, a few blocks and parked her in the garage, everyone kept telling me they smelt gas but I could not find any leaks until last night when it was brought up again, looked the gas cap and filler nosel and noticed something I wished never to see!
seems the heat had helped expand the volume and was over flow was being pushed back out the cap, slowly working the paint up around the base of the nosel, quickly soaked some out of the tank and ran the truck for about 30 minutes but the damage is done! thank god it stop at the nosel and didn't work the red out below. Don't fill the tank if your not driving it every day! I'll be trying to work the magic with the touch up brush tonite.

Yep, Kansas can get mighty hot like that in the Summer too. Always fill up before a longer drive. I like to fill up at a filling station that has a bit of an incline and I part with the filler tube down hill so I cannot get it compelely full. There after I always try to park filler tube "uphill".

Of course, it might be logical to just never fill these old girls to the top, at least in the summer. Kind of messes up calculations about fuel economy though.....

If the pressure is high enough, you'll get vapors in the cab and I have been having trouble with some oozing aroung the double flair joint on top of the tank.

I tend also to try and remember on hot days to always let the pressure out when I park, big hiss and then it seems to give less trouble thereafter....