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4020 Fuel Tank Leaking

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Rick in Michiga

05-18-2004 06:47:22

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The fuel tank (diesel) in my 4020 is leaking. I pulled it out and found several brazed 'repairs' on the bottom. What type of material is the tank made of? It appears to be Stainless Steel but I'm not sure.

Anyone have hints on good repair procedures?

If I have to I'll grind the old braze off and re-braze it, but I anticipate I'll have to cut the repaired area out and install a complete patch if I go that route.

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Russ

05-18-2004 17:43:22

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Re: 4020 Fuel Tank Leaking in reply to Rick in Michigan, 05-18-2004 06:47:22

TANKS A LOT; NOT SURE, BUT WHEN I REPLACED A 26 GALLON FUEL TANK ON MY OLDSMOBILE THE LEAKY TANK HAD PIN HOLE CORROSION MOSTLY AT THE SEAM. THE INSTALLER CUT OPEN THE OLD TANK AND IT WAS GALVANIZED ON THE INTERIOR AND IT LOOKED BRAND NEW. THE FIX WAS A NEW REPLACEMENT TANK.

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Henry J

05-18-2004 11:37:35

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Re: 4020 Fuel Tank Leaking in reply to Rick in Michigan, 05-18-2004 06:47:22

Rick

If pin holes are confined to a reasonably small area, I would grind it down and put a coat of JB Weld on the outside, then prime and paint it.

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G-MAN

05-18-2004 07:39:02

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Re: 4020 Fuel Tank Leaking in reply to Rick in Michigan, 05-18-2004 06:47:22

I believe the tank is just plain old mild steel. It's not uncommon for them to leak, particularly if the fuel system hasn't been maintained and the tank hasn't been drained of accumulated water. The water settles on the bottom and rusts through. Depending on how bad it is, it could be welded, patched or it may just be easier to install a good used tank. Cleaning it thoroughly and coating it inside with sealer would also be a good idea when reinstalling, as would a good coat of primer and paint on the tank exterior.

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Rick in Michigan

05-18-2004 07:45:28

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Re: Re: 4020 Fuel Tank Leaking in reply to G-MAN, 05-18-2004 07:39:02

G-MAN,
The only reason I thought it was made of Stainless is because there is no rust anywhere on it.
I plan on grinding it down when I get home tonight to see exactly how much damage I'm working with.
If I feel this tank warrants repair I'll follow your suggestions on sealing the inside and primer/paint the exterior...probably do the same if I find a good used tank.

Thanks for the input!

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G-MAN

05-18-2004 10:31:53

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Re: Re: Re: 4020 Fuel Tank Leaking in reply to Rick in Michigan, 05-18-2004 07:45:28

Trust me, there's some rust - right where the leaks are. It's been ages since I had one of those tanks out, but I know they're not stainless. They might be galvanized to some degree, but they are not stainless, or they would "never" rust out.

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zane

05-18-2004 18:55:22

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Re: Re: Re: Re: 4020 Fuel Tank Leaking in reply to G-MAN, 05-18-2004 10:31:53

G-Man's right. They're made of mild steel. And it would be hard to galvanize the inside of a fabricated tank like that.

The J-B Weld might work. I've seen it do some remarkable repairs.

Mine rusted pinholes right in the bottom where water had set. I had it fixed at a welding shop many years ago. They were able to braze it up, but the metal was very thin. (Careful with the grinding!)

I've had no further trouble. But I keep that sucker drained!

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G-MAN

05-19-2004 07:37:30

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Re: Re: Re: Re: Re: 4020 Fuel Tank Leaking in reply to zane, 05-18-2004 18:55:22

Yes, they are VERY thing, particularly on the bottoms. The first time I pulled one, I couldn't believe how light the tank was. I was expecting it to be fairly heavy.

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