Erik Hoeffner

Hey guys, I'm having a major issue, this on a 91 with a 20 gallon steel tank: About 3 months ago my gas tank formed a tiny crack on the bottom with no cause to claim. Picked one up at a JY and had a shop put it in. Because I picked it up I inspected and saw it was rust free and clean. So - about $300 and a long JY drive. Well now this tank has spawned a leak in the same spot (haven't pulled the shield but it dripping from roughly the same area). The past 6 months or so I noticed a ton of pressure being released when loosening the gas cap, after a fill up I have had times the cabin smelled gasy. With the new tank I started getting this "pop/bang" noise; it was so loud once I though someone hit me...anyways my assumption is the noise was the tank flexing somehow from pressure in the tank, as I don't hear it now with it leaking. And the possibility i hypothesize is no tank venting is happening to let vapors out. Is it possible that pressure is building so much in the tank that it is causing a weak spot to stress and crack? There are no line leaks, no leaks at the pump ring, just the bottom on the drivers side out of a hole in the shield. Really need to pinpoint this before I put a new tank in just to crack again...thanks in advance.

Erik Hoeffner

Wow nothing? Ok, well anyone have experience with Evap canisters going bad at least, any tips or info on that?

DFlintstone

Not a load of expertise here. Changed a number of those pumps and have a general idea of the evap function. It's the same general setup as 87-90, but there were lots of changes there, they may have added an evap solonoid in 91, clueless there, here.

So you have done some "knoggen-poken", and verified it's not the O ring seal for the pump assembly, or a line that you can see. Two lines forward are fuel delivery and return, (to the pump plate). Then a third, vent goes up top right? I suppose If I could isolate it to the upper vent, I'd contact the people who installed it and see what they say.

A question, you are not topping it off are you? Gotta wonder if a flooded canister can vent right. Google there maybe.

Alex, I'll take smashed, pinched and leaking vent tube, due to sloppy install for 1000. Or , can you see a nipple for the line?

Erik Hoeffner

Well yeah, I'm guilty of topping off over the summer because of the lower gas prices. Usually only a click or two. But I wouldn't be surprised if it's the evap because I was topping it off. I've never done it except this year, and go figure now I have replaced two gas tanks in less than four months...so you can all tell me off if you like. I didn't think topping off was the best idea...but really I'm just looking for tips and help on swapping the tank and servicing/replacing the evap, and of course calling put to anyone that had the same or simular issue.