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Old 02-12-2008, 01:06 PM   #1 (permalink)
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best epoxy or glue to patch hole in gas tank

like the title says, i have a hole to patch on my plastic gastank. i will be putting a steel plate and glueing it to the tank. i already used jb weld on it and it lasted about two weeks before the leak came back. any other ideas before i shell out money for a new tank>?
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Old 02-12-2008, 01:13 PM   #2 (permalink)
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weld a plastic patch on. then coat the weld with por15 tank sealant to kill any pinholes you missed.
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Old 02-12-2008, 01:19 PM   #3 (permalink)
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if it is an actual hole, plastiweld will be th eonly way ....

if its a tear / pinhole, rub it good with ivory soap .... you think im being a smart ass, but ivory soap works well for trailfixing a small leak ... i did it on a lawnmower tank a few years back and it hasnt leaked yet.
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Old 02-12-2008, 01:24 PM   #4 (permalink)
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Get a plastic welder. Probably would need to drain the gas...it's kinda like a big soldering iron.

There's a guy on here that welded and entire plastic gas tank back together after stretching the wheel base on his heep.

http://www.harborfreight.com/cpi/cta...emnumber=41592

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Old 02-12-2008, 01:45 PM   #5 (permalink)
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I've fixed holes in tanks by drilling the hole out and putting a bolt with a toggle nut through it. at the head of the bolt have a washer and under it a neoprene washer. squeeze some fuel tank repair putty up around the hole and the threads and tighten that thing down.

I've been running it on the rear tank in my truck for about 4 years now with no issues. infact it lasted 3 1/2 years on one truck, truck got majorly wrecked, and then i swapped the tank into the truck I have now. still holds.

Justin

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Old 02-12-2008, 01:55 PM   #6 (permalink)
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Out here, they sell Plastic Gas Tank repair kits at the auto parts store.
I'd just use that.
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Old 02-12-2008, 02:05 PM   #7 (permalink)
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i've used JB weld on a few cracks and pinhole leaks in my old YJ's tanks. not sure if it's a good idea, but it worked fine. hell i put another 150,000 on it after one of the seams split and i jb welded the shit out of that one.
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Old 02-12-2008, 03:19 PM   #8 (permalink)
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the jb weld i used became soft and brittle by the end of two weeks.
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Old 02-12-2008, 03:39 PM   #9 (permalink)
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JB WELD didn't stop a leak in my aluminium cell BUT SEAL-ALL did work on my plastic tank.
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Old 02-12-2008, 05:29 PM   #10 (permalink)
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There is some polyethylene glue called Gorilla Glue that is available in hardware stores around here that worked on some water tanks I have where nothing else would stick for very long. Don't have the bottle anymore to check for applications but it does stick to poly tanks like nobodies business. Might be worth a try-cheaper than plastic welding equipment.
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Old 06-26-2010, 03:43 PM   #11 (permalink)
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I used tire plugs to seal a 2 inch gash in a tj plastic tank to get a friend out of the rubicon, it held for days and is still not leaking weeks later..
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Old 06-26-2010, 05:31 PM   #12 (permalink)
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I welded my steel one with a mig. Ran a radiator hose from my truck exhaust in the tank and let it idle for 15 minutes. So if you do any heat or flame on the plastic make sure to get rid of the O2 with exhaust.
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Old 06-26-2010, 07:01 PM   #13 (permalink)
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Fiberglass!
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Old 06-26-2010, 08:58 PM   #14 (permalink)
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Had a humvee come in the shop in Iraq with a spent 50. Cal casing hammered. In and it had held for months. Good luck finding one stateside though...
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Old 06-26-2010, 09:28 PM   #15 (permalink)
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if you use fiberglass stay away from ethonal it will make the patch soft.there is a 3 m epoxy that you get at the bodyshop supply house cant remember the part no. will work even better with the plate if you can put presure on it while it cures i think its called riged parts repair formula i have even used it on batterys
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Old 06-27-2010, 06:38 AM   #16 (permalink)
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Quote:
Originally Posted by rockrknockr View Post
JB WELD didn't stop a leak in my aluminium cell BUT SEAL-ALL did work on my plastic tank.
This stuff kicks ass, it's dirt cheap and it sticks like snot to gasoline wet plastic.

I tore off the exhaust before my cat on a 1990 pontiac tempest, so obviously I just stuck a cherry bomb on where the cat was. Problem was the exhaust was pointing right at my plastic gas tank. Eventually it melted about twenty small holes in the tank. I used that seal all shit just to try and hold temporary, it hardened up like epoxy (did my fix in winter too -25 C) and I ended up leaving it like that.

Eventually my heat shield (that I neglected to remove) was rubbing the gas tank and sliced a hole about 11 inches wide in the tank above where the pin holes were. You guessed it, seal all, I used two tubes this time (about $5 each) and worked again.
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