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#4292790 - 01/04/17 01:48 AM Recommend glue for sealing cracked fuel tank cover
zorobabel Offline


Registered: 01/27/11
Posts: 186
Loc: Anaheim, CA
My 97 Maxima has developed a gas leak which I traced to a hairline crack in the plastic fuel gauge sending unit, which acts as a cover for the fuel tank. The part seems rather expensive at $130+, so I want to try mending it.
Can you please recommend a glue that would work and hold up to gas and alcohol?
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1997 Maxima 155k VWB, Wix 51516
2004 Corolla 177k QSUD 5w30, M1-209

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#4292793 - 01/04/17 02:05 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Ducked Offline


Registered: 10/25/12
Posts: 2282
Loc: Taiwan
Long time ago I used leftovers from a glass fibre body repair kit, which is a polyester resin. IIRC that wasn't even supposed to work then (though it did) and petrol formulations have allegedly got more aggressive in the interim.

Now I'd probably try epoxy. If you can wait, maybe whatever you try you could test its petrol resistance first to avoid contaminating the surfaces with something ineffective, in case you find something better later on.

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#4292795 - 01/04/17 02:37 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
rooflessVW Online   content


Registered: 12/24/11
Posts: 2225
Loc: North Carolina
PS 870 B.

It's expensive though...
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#4292824 - 01/04/17 05:31 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
umungus1122 Offline


Registered: 02/12/08
Posts: 885
Loc: PA
VersaChem, Permatex, and others make gas tank specific repair kits. Since your looking to fix a plastic part instead of the steel itself, I'd look into a plastic specific bonding epoxy that is solvent(or at least gas) resistant.
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'95 Chevy 1/2t 305 200k - QS DEFY 5w-20, CARQUEST Red(wix made) filter
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#4292827 - 01/04/17 05:39 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: umungus1122]
sdowney717 Offline


Registered: 10/01/05
Posts: 298
Loc: Newport News, VA
I repaired a cracked filler tube neck in a 1998 Ford contour, leak stopped. That was years ago and it never leaked again.
They call it PL S30 nowadays. Gas has changed since then. I would still use it today.
I used Black Loctite PL Polyurethane roof and flashing caulk. You can put on a layer about 1/8 to 1/4 in depth.

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#4292878 - 01/04/17 07:16 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
tc1446 Offline


Registered: 12/10/10
Posts: 793
Loc: Lexington, NC
JB Weld makes a variety of epoxies that should work.
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#4292882 - 01/04/17 07:23 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: umungus1122]
Bgallagher Offline


Registered: 04/17/12
Posts: 2789
Loc: Boston, MA
Originally Posted By: umungus1122
VersaChem, Permatex, and others make gas tank specific repair kits. Since your looking to fix a plastic part instead of the steel itself, I'd look into a plastic specific bonding epoxy that is solvent(or at least gas) resistant.


+1
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#4292908 - 01/04/17 08:01 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Blkstanger Online   content


Registered: 08/13/11
Posts: 1604
Loc: Lakeside, CA
3M 8802 gas tank sealer
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#4292913 - 01/04/17 08:05 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: tc1446]
fxrider Offline


Registered: 06/09/09
Posts: 990
Loc: Wyoming
Originally Posted By: tc1446
JB Weld makes a variety of epoxies that should work.
been there done that. works great.

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#4292958 - 01/04/17 09:22 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Panzerman Offline


Registered: 12/16/06
Posts: 3427
Loc: Port Orange, Florida
Playing with small engines and chainsaws for a hobby I have often found problems with cracked leaking gas tanks. I tried alot of epoxies and sealers, all of which were short term solutions. Nothing worked for long. What I have found that works forever and quickly is a soldering iron or wood burner. Melt the plastic back together. I just repaired a plastic chainsaw tank with a large crack and hole. Works like a charm. Not dangerous and pretty much permanent.
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#4293043 - 01/04/17 11:13 AM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
zorobabel Offline


Registered: 01/27/11
Posts: 186
Loc: Anaheim, CA
Thanks for the replies!
I'm favoring J-B Weld at this point. Should I go with the regular or the WaterWeld?

@Panzerman - I assume you just melt a bit on the surface of the plastic, and spread it over the crack?
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1997 Maxima 155k VWB, Wix 51516
2004 Corolla 177k QSUD 5w30, M1-209

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#4293109 - 01/04/17 12:14 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
bigt61 Offline


Registered: 02/12/13
Posts: 2875
Loc: Virginia
I'd get this - but likely any JB Weld will work.....

https://www.amazon.com/J-B-Weld-8217-AutoWeld-Repair/dp/B00R2CDUWE
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#4293110 - 01/04/17 12:14 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
sdowney717 Offline


Registered: 10/01/05
Posts: 298
Loc: Newport News, VA
Originally Posted By: zorobabel
Thanks for the replies!
I'm favoring J-B Weld at this point. Should I go with the regular or the WaterWeld?

@Panzerman - I assume you just melt a bit on the surface of the plastic, and spread it over the crack?


You need to actually dig the tip into the crack, then force the material from the sides to fill and level.
It can work, works good on some plastics. Some it just does not work well, you get a weak result.

You can buy plastic welding rods, but the plastic types must match.

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#4293112 - 01/04/17 12:17 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
JimPghPA Offline


Registered: 08/22/09
Posts: 3487
Loc: Pittsburgh,PA U.S.A.
Don't mess with heat and a gas tank.
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JimPghPa


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#4293131 - 01/04/17 12:36 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1008
Loc: Saskatchewan, Canada
It all depends on the type of plastic you are dealing with. Some take glues well, some don't.

First choice for me would be a Putty Epoxy ... easy to apply, works on water wet or gasoline wet areas, and impervious to gasoline and alcohols. If you're dealing with certain plastics that won't glue up ... your option at that point is plastic welding (basically a form of heat melted plastic bond). Try Eastwood for the relevant supplies.

That may not work either ... some plastics get brittle if heated. But those are your basic options.
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#4293166 - 01/04/17 01:28 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: JimPghPA]
Panzerman Offline


Registered: 12/16/06
Posts: 3427
Loc: Port Orange, Florida
Originally Posted By: JimPghPA
Don't mess with heat and a gas tank.


You can boil gasoline. It will not go off. I showed my son this camping. Regardless you will never ignite gas with a soldering iron. Just as the other gentleman said, you heat the sides of the crack and draw the Molton plastic in and smooth it out. Makes a permanent repair.
_________________________
2007 Ford F-150 FX-2 79,000
2007 Ford F-150 FX-4 212,000 (Sold to the Son).
2006 Dodge Ram 2500 Sport 4x4 76,000
2016 Dodge Challenger RT Skat Pack 84

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#4293170 - 01/04/17 01:29 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Panzerman Offline


Registered: 12/16/06
Posts: 3427
Loc: Port Orange, Florida
The plastic welders and plastic rods are terriable. They don't work well.
_________________________
2007 Ford F-150 FX-2 79,000
2007 Ford F-150 FX-4 212,000 (Sold to the Son).
2006 Dodge Ram 2500 Sport 4x4 76,000
2016 Dodge Challenger RT Skat Pack 84

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#4294152 - 01/05/17 01:41 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
HosteenJorje Offline


Registered: 05/26/14
Posts: 2033
Loc: Columbus,Nebraska
I wouldn't take short cuts with a fuel leak. Editor of our local newspaper was working about 12:30 AM Wednesday when one of the delivery help came rushing in to tell him his car was on fire.Vehicle was a total loss. He reported that he had been going to take car in to mechanic this week for what he thought was a coolant leak. Kaboom. Too lazy to open the hood.

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#4294313 - 01/05/17 04:43 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: Panzerman]
Ducked Offline


Registered: 10/25/12
Posts: 2282
Loc: Taiwan
Originally Posted By: Panzerman
Originally Posted By: JimPghPA
Don't mess with heat and a gas tank.


You can boil gasoline. It will not go off. I showed my son this camping.


It MIGHT not go off. WILL not go off is something of a stretch.

If you were camping you were presumably using a naked flame?

To demonstrate how to boil petrol?

To your son?

!!!!!!

One can of course get lucky.

OK Close Shave Petrol Story.....um...bit spoilt for choice, but I find this one hard to forget.

1800 Marina estate. Prequel to the repair described above. Filled up on the way home and the smell of petrol seemed more persistent than usual. Actually stopped to check, but it was dark and (of course) [censored] down and I couldn't see anything. Home late and forgot about it.

Next day woken by nosey neighbour who complains my car is leaking petrol down the street. Indeed. ALL the way down the street gutter, under lots of much shinier cars.

What to do? Have a couple of large jerricans, but have learned that siphoning petrol out of a tank really only works well in the movies. Decide to remove the tank and decant petrol directly.

EDIT: I'd better point out, for any petrol-boilers who might be reading, that most people would probably consider this was a somewhat dangerous thing to do, but everything is relative.ENDEDIT

Lying under the car in a small river of petrol, I'd unbolted the (still almost full) leaking tank and lowered it onto my chest, where it was soaking my overalls, and had just started to wriggle out with it, when the nosy neighbour (who'd complained about the leak in the first place) stuck her head down over the gutter to check on progress.

Did I mention she was a CHAIN SMOKER?

I couldn't look at first.

Then I looked and couldn't speak.

Then I spoke, but I had to be VERY polite to avoid agitatating the STUPID COW, since the ash didn't look very stable.

One of my nearer death experiences.


Edited by Ducked (01/05/17 04:49 PM)

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#4294318 - 01/05/17 04:50 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
Nick1994 Offline


Registered: 02/19/13
Posts: 7726
Loc: Phoenix, AZ
Same thing happened to my Camry last summer. Got a $50 fuel pump assembly from the junk yard. Working good.
_________________________
2015 Hyundai Sonata 2.4L 57k PU 5w30 & OEM
2000 Toyota Camry 2.2L 227k M1 0w30 & Wix
1996 Jeep Cherokee 4.0L 142k Napa 10w30 & Fram Ultra

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#4298704 - 01/10/17 01:33 PM Re: Recommend glue for sealing cracked fuel tank cover [Re: zorobabel]
zorobabel Offline


Registered: 01/27/11
Posts: 186
Loc: Anaheim, CA
I ended up using the JB-Weld Waterweld putty. There were a number of hairline cracks in that plastic, in retrospect I should have bought the new part.
But so far (48hrs), no gas leak, no gas vapor leak or smell.
Thanks for the replies!
_________________________
1997 Maxima 155k VWB, Wix 51516
2004 Corolla 177k QSUD 5w30, M1-209

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