Skid Plate for 20 Gal. steel gas tank? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-17-2005, 09:46 PM Thread Starter
 
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Skid Plate for 20 Gal. steel gas tank?

I have a steel 20 gallon gas tank for my CJ7 and it has developed a pinhole leak on the bottom. I was wondering if I could drop the tank, empty it, seal the hole and then add a skid plate.

Instead of making a separate skid plate I was thinkng of just welding on a piece of 3/16" or 1/4" plate directly to the bottom of the tank (fully welded circumferentially - not interrupted stiches). We don't have too may rocks where I wheel so I won't actually be purposely "skidding" on anything - it would just be extra protection against further pinhole leaks since the oversize tank hangs so low.

Any reason not to do this or other suggestions?
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post #2 of (permalink) Old 05-17-2005, 09:54 PM
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Re: Skid Plate for 20 Gal. steel gas tank?

Are you sure the tank material is thick enought to take the heat to bond it with the 3/16 material? I just think you'd have a hard time getting it to seal and hold. But I'm not a welder, either.
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post #3 of (permalink) Old 05-17-2005, 10:06 PM
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Re: Skid Plate for 20 Gal. steel gas tank?

The first thing that would worry me was welding to a gas tank. I would suggest just makeing a new skid plate the attatches smilar to the stock one.
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post #4 of (permalink) Old 05-17-2005, 11:03 PM
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Re: Skid Plate for 20 Gal. steel gas tank?

I thought the stock 20 gallon tank was plastic.
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post #5 of (permalink) Old 05-17-2005, 11:27 PM
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Re: Skid Plate for 20 Gal. steel gas tank?

[ QUOTE ]
I thought the stock 20 gallon tank was plastic.

[/ QUOTE ]

And that is because it was, it was an AMC thing.

[img]/ubbthreads/images/graemlins/40BEER.gif[/img]
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post #6 of (permalink) Old 05-18-2005, 01:17 AM
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Re: Skid Plate for 20 Gal. steel gas tank?

I think Will is right...it should be a plastic tank.
If it is plastic...and leaking...don't try to fix it. Replace it.
If it is metal, don't bother welding a skid plate to it....The this sheet metal is not thick enough to support that type of welding. About the only way you can seal the tank is to brase it.....basically the same thing that is done with radiators.

Gas tanks are one of those things you don't want to take short cuts with.
post #7 of (permalink) Old 05-18-2005, 07:29 AM Thread Starter
 
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Re: Skid Plate for 20 Gal. steel gas tank?

It's an aftermarket oversize tank. It came with the Jeep when I bought it 8 years ago.

Certainly the tank will be removed from the vehicle and completely emptied before welding is attempted!

I do appreciate the input about the thickness of the tank. Maybe I'll try some JB weld and then fab up a separate skid plate.
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post #8 of (permalink) Old 05-18-2005, 11:10 AM
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Re: Skid Plate for 20 Gal. steel gas tank?

If it looks thin...you might consider going back to the stock plastic tank....

About 5 years ago I did the Dusy Hersham up in N CA....changed my gas tank from 20 gal to about 10 gal on one part of the trail...tank shield was toast, but the tank held.

I made a new tank shield out of 10g steel....still using the plastic one inside of it....no rust...no leaks...I think this is a better way to go.
post #9 of (permalink) Old 05-18-2005, 11:19 AM Thread Starter
 
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Re: Skid Plate for 20 Gal. steel gas tank?

This is the only tank I have! I don't have an extra stock tank laying around that I can just swap in.
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post #10 of (permalink) Old 05-18-2005, 11:30 AM
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Re: Skid Plate for 20 Gal. steel gas tank?

One of the concerns I have is that if it's got one pin hole, more aren't far behind. So, by repairing the tank you might be dismayed to find more pin holes to follow in short order. In fact, the welding of the tank will stretch/contract the surrounding metal, and may cause a few more holes to open. That's not to say you shouldn't do it. By doing the repair you'll buy time.

Steel tanks benefit from good priming and painting. This seals the outside of the tank from the elements. The inside of the tank is often forgotten. This is an oversight that bites one in the butt many miles down the road.

After repairing the tank it's not a bad idea to make sure it's coated on the inside. This prevents corrosive action from penetrating the steel and starting the pin holes. It also will help seal those areas that may now be developing into new pin holes.

The POR people make a good tank coating, as does Eastwood Products and about a thousand other manufactures.
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