Ideas on fuel tank '80 450SL - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 12-20-2007, 02:44 PM Thread Starter
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Ideas on fuel tank '80 450SL

Trying to restore an older, rough 450SL. The first step is to get it running. My indy says the fuel tank is shot. The rust on the inside keeps coming back immediately after an acid treatment, so the only suggestion is a used from Adsit for $585 or from a junk yard.

Any suggestions or ideas? I've looked at all the usual MB parts places, including oursl.com but with no luck. Appreciate any help on this.
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post #2 of 12 (permalink) Old 12-20-2007, 04:46 PM
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Somebody makes a coating for the inside of gas tanks. Once you get the inside cleaned out, you pour this stuff in and rotate the tank around to coat the inside, let it dry and is suposed to prevent any further flaking. Not sure who makes it but I think Por15 website may have something on it.

Fuel System Restoration-POR-15 Inc.

Gary

1973 450SL AMG kit installed
1999 Silverado 4X4 Ext Cab
1999 Mercury Sable
1972 450SL - Parts Car - Need anything?

Previously owned keepers:
1967 MGCGT - 3L-6
1972 Mustang Fastback - 351C

Current Cylinder Index: 28
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post #3 of 12 (permalink) Old 12-20-2007, 04:58 PM Thread Starter
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Yeah, that was the plan. The first step is to use an acid solution to remove the rust, but there was so much that the surface immediately got rusty again.
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post #4 of 12 (permalink) Old 12-21-2007, 09:02 AM
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There folks can do wonders with rusty, holey, pitted fuel tanks - Gas Tank RENU - USA

Len

Last edited by sokoloff; 12-21-2007 at 09:04 AM. Reason: spelling
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post #5 of 12 (permalink) Old 12-23-2007, 05:08 PM
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Eastwood has a good gas tank cleaning and seal kit which I have used. Follow the instructions and it works well. I had no more problems with rust tank. This is link
Eastwood Co. - Gas Tank Sealer Kit For Cars

benzfleet
1973 280 W114 (Driver - 140,000 miles)
1974 280C W114 (Now running - driven off and on this summer)
1968 200D (Engine rebuild planned)
1964 200 (gasser parts car) & 1966 200D (complete car - Got to run. Now to see if clutch can be repaired.)
1980 300D W123 (Parts car - engine runs, but trashed)
1981 240D W123 4 speed ( In sad shape when bought - many parts from '80 300D has back on the road. Needs work, but shows promise.)
1988 300TE W124 (Does not run. 180,000)
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post #6 of 12 (permalink) Old 12-23-2007, 05:33 PM
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I got the same problem on my w123 I took tank out and shaked a whole lot of rust part chucks out of tank. But I think even my vapor and retun lines are clogged. This is from a car that's been sitting for 17 years. There was a nice big mouse nest behind the gas can. I can only imagine where else they built nest. That renu place looks promising only wonder what they charge.
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post #7 of 12 (permalink) Old 12-25-2007, 08:08 PM
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Quote:
Originally Posted by engr693 View Post
Somebody makes a coating for the inside of gas tanks. Once you get the inside cleaned out, you pour this stuff in and rotate the tank around to coat the inside, let it dry and is suposed to prevent any further flaking. Not sure who makes it but I think Por15 website may have something on it.

Fuel System Restoration-POR-15 Inc.
I've used POR-15 on my 108. For the past 5 years I am very satisfied with it to date.
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post #8 of 12 (permalink) Old 12-26-2007, 08:19 PM
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If the gas tank is that rusty, I'd just get another from a junk yard. The W111, W108 and W114 all had the same mounting plates and such. A tank is a tank is a tank. I tried the tank coating stuff with a motorcycle, and it worked a couple months before the coating dissolved and totally gummed up the carbs.
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post #9 of 12 (permalink) Old 12-27-2007, 04:57 PM Thread Starter
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Update: My tank is truly shot, unreparable. I searched the net and found several used ones from various salvage yards throughout the US , but they implied that they can't ship a used fuel tank! So I concentrated on ones closer to home. Luckily, I found one 200 miles away for $75 + $25 for shipping! Might be too good to be true, so I've got the info on the liner coatings as well.

Thanks for all the replies and suggestions.
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post #10 of 12 (permalink) Old 12-28-2007, 07:10 AM
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Originally Posted by roncor View Post
Update: My tank is truly shot, unreparable. I searched the net and found several used ones from various salvage yards throughout the US , but they implied that they can't ship a used fuel tank! So I concentrated on ones closer to home. Luckily, I found one 200 miles away for $75 + $25 for shipping! Might be too good to be true, so I've got the info on the liner coatings as well.

Thanks for all the replies and suggestions.
Have the Renu folks told you that your tank is unrepairable? I've got to tell you, they can do amazing things with what some thought was an unrepairable tank. For $75 for a used tank, my guess is that you're going to need to treat it some way too. The DIY treatments are okay for minor tank issues, but if your tank is really hurting, the pros need to do it IMO.

Len
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