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HelicopterOff Topics › JB Weld vs. Gasoline
06-02-2009 08:16 PM  8 years agoPost 1
500Driver

rrApprentice

Burlington, IA

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Mowing the lawn this afternoon and a bolt holding the fuel tank on came loose...allowing the tank to vibrate against the engine...causing a ding in the tank (it's metal)...and...a small crack.

So...anyone know if JB Weld will stand up to Gasoline?

Soldering or actually welding is probably the proper thing to do but I don't have the equipment.

Thanks!

When in doubt...auto out

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06-02-2009 08:20 PM  8 years agoPost 2
BeltFedBrowning

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Kansas City

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JB weld will work for a while but the gas will eventually soften it. Soldering would be the way to go, just not with an open flame. I have seen a lot of people maimed by attempting to weld gas tanks. Some have tried filling them with water. They still explode. Soldering iron only!

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06-02-2009 08:26 PM  8 years agoPost 3
DougsRC

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Mass.

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I have used a two-part putty from Permatex called "gas tank repair" that actually worked on a car gas tank. Got it at AutoZone, mix the putty together, clean the area--put it on quick. Hardens in about 5 minutes and actually sealed the leak---just another option.

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06-02-2009 10:24 PM  8 years agoPost 4
500Driver

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Burlington, IA

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Cool...thanks guys.

HAha...yeah...seems like open flame welding of a gas tank (even an 'empty' one) would be asking for a Darwin Award.

When in doubt...auto out

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06-03-2009 02:52 AM  8 years agoPost 5
Mark C

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Houston, TX - USA

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Straight from the JB Weld website:
Use J-B WELD for:
YOUR HOME
•hot & cold pipes
•appliances
•tools
•toys, hobbies & crafts
•guns
•lighting fixtures
•bikes
•lawnmowers
•fences
•furniture
•luggage
•sporting goods
•ceramic tile
•water & fuel cans, tanks, and tubs
And yes, I asked the exact same question here a couple years ago http://runryder.com/helicopter/t388...repair+gasoline

I got the same answer I am giving you and the repair inside the carbretor is still holding fine using JB weld after almost 2 years.

Mark C.

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06-03-2009 04:20 AM  8 years agoPost 6
Isaiahsdad

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Midwest City, Oklahoma

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JB Weld fixes EVERYTHING!!! And what it doesn't, duct tape does.

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06-03-2009 06:40 AM  8 years agoPost 7
2HUVR

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Casa Grande, Arizona

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jb weld
I actually used jb weld to fix a spot on the top of a cylinder wall that was ate out by water causing the head gasket to leak. It actually held and never leaked or caused a problem for the 4 years after that that I had the car. JB weld won me over!!

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06-03-2009 11:08 AM  8 years agoPost 8
cfranks

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Adelaide South Australia

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I converted the two scale dummy tanks on a Vario Schweizer 300 gasser to real tanks and used JBWeld to seal them. Never had a leak.

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06-03-2009 11:50 AM  8 years agoPost 9
gingus1

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Lafayette,La.

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JB WELD will work. I had a hole at the very bottom of my gas tank on my truck and JB weld held for as long as i owned the truck which was over ten years.But you must clean the area good.

You Da-Man

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06-03-2009 01:09 PM  8 years agoPost 10
500Driver

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Burlington, IA

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Haha...wow...thanks guys!

I know JB Weld is good stuff considering the mechs always used it in full-scale helicopter applications.

I went ahead and dabbed some on the crack last night and just checked it...seems to have set fine. Put the mower back together and she fired right up. So...looks like I'm back in business...for now. The mower is on it's last legs anyway but I'd rather fix it as long as I can instead of scrapping it.

Thanks again.

Go JB Weld

When in doubt...auto out

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06-03-2009 02:56 PM  8 years agoPost 11
ttsingram

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Lincoln, Ne

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I have used a two-part putty from Permatex called "gas tank repair" that actually worked on a car gas tank
I've used this on motorcycle tanks, it works great.
HAha...yeah...seems like open flame welding of a gas tank (even an 'empty' one) would be asking for a Darwin Award
It's done all the time actually. You just fill the tank 90% with water to dissapate the fumes.

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06-03-2009 04:00 PM  8 years agoPost 12
BeltFedBrowning

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Kansas City

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I have tried the emptying the tank and filling it with water. I was using a propane torch to solder a crack. It expanded the tank and sounded like an M-80 going off next to me. Never weld or solder a gas tank without having it boiled out first. I was very lucky I wasn't hurt and I never tried it again. Like I said I have been an ASE certified auto mechanic in a farming community for 22 years and I have used every type of tank repair that there is. JB weld is very good but I have seen it fail because the gas softened it up in a few years. It is great for a quick repair as long as the surface is clean and dry.

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06-03-2009 04:37 PM  8 years agoPost 13
RCHSF

rrKey Veteran

NC

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JB Weld, SuperGlue,Epoxy, and Ducktape will Fix anything.

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06-03-2009 11:49 PM  8 years agoPost 14
500Driver

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Burlington, IA

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Well...update on my mower.

The JB worked great...not a drip of fuel from the repair.

However...the problem was more severe than I originally realized.

Turns out the motor was vibrating because the deck was rotted at one of the mounting bolts. I was running for almost an hour when everything just let go. Shook so hard in a matter of 1 second that the muffler came off and the fuel tank/carb assembly that I'd torqued on earlier came loose. AND...it actually cracked the engine case around the mounting base.

Dang.

Very liberal amounts of JB weld might get her back together but I think it's time to say goodbye

When in doubt...auto out

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06-04-2009 02:12 AM  8 years agoPost 15
Mark C

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Houston, TX - USA

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He he he... My condolences on your loss.

I'd bet you are typical of everyone else here - helicopter blinged to the hilt but you other stuff like lawnmowers and hot water heaters are held together with duct tape and JB Weld

There is this one guy we flew with who crashed his heli into his pickup. He had the heli down the next day repairing it like brand new. When the sold the pickup the front was still smashed where he crashed into it.

Mark C.

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