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Clean and coat inside of gas tank


NYNick

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I need to remove any and all rust from the inside of my tank and seal it afterwards. I've seen some youtube videos of people using vinegar, bb's, nuts and bolts, Eastwood products, POR 14, Red Kote etc. I even saw someone attach his bmw tank to the rear wheel of a jacked up car and have the wheel rotate the tank with nuts and bolts inside. 

 

So what's the preferred method? Sure would need a lot of vinegar to fill up an 02 tank! Suggestions?

 

TIA

 

Nick

1974 2002 Tii-SOLD

1978 911SC Coupe

1988 Landcruiser

2020 M2 CS

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Nick pick the sealer you want to use and follow their instructions on cleaning the tank to the letter, cleaning the tank is the critical step in the process and they will have researched the best way for their product. 

If everybody in the room is thinking the same thing, then someone is not thinking.

 

George S Patton 

Planning the Normandy Break out 1944

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If there isn't any more than just a little flash rust, I like to do a diluted acetone clean/shake with a few nuts/bolts.  After that, just slosh around some automatic transmission fluid until the tank is ready for gas.  Do not coat unless it's necessary.

 

If it's rusty and needs repair, then sure a coating is great.  I've seen success with RedKoat and Caswell.  However, as mentioned, it all comes down to prep.

 

On the bottom half of the exterior it's a nice touch to brush on a thick layer of two-part epoxy primer for a little extra oomph.  The brush strokes can be easily hidden by textured undercoating.

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POR-15 worked well for me.  Two years now.  Be prepared for loooooong drying times post-cleaning, post-derusting, and post coating (probably applies to any product you use; acetone likely less time).  Photos:  1 before; 2 after. 

Good luck.

Larry

IMG_4842.thumb.jpeg.f654466365ecbf2a4627eb828602ef96.jpegIMG_4888.thumb.jpg.253a9194c0e4b394b2af3c235b3fcdef.jpgIMG_4899.thumb.jpg.9b9b59dd940610037076124adbdc52bb.jpg

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Nick,

My Tii tank was rusty inside plus it had been coated with something red that was flaking off.

I bit the bullet and had the 'tank renu' process done. It was costly but is guaranteed for as long as I own it.

 

It was treated by a place in Louisville, Ky. who design and build commercial heat exchangers.

Looks great inside and out.

 The process: It is literally cooked to remove any previous coating and old gas sediment. Then they cut a hole in the side ( they actually asked my input as to location so it wouldn't show one installed). It's the blasted inside, washed, hole rewelded, treated with the special coating inside and out and baked. Pricey?...yes . $325. But, it will probably outlast the car and it's done right.

 

Good luck, Steve 

 

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The POR15 kit worked fine for me, been several years since I did it.  I had a small leak before I did it, possibly in a seam, and it took care of that.

yeah, follow the instructions, but when the instructions say to stir it until it’s all a homogenous color, don’t worry so much about that. Just stir a really long time.  I couldn’t get it all to look perfectly homogenous, and had to google it to find out that the stuff pretty much never gets homogenous,

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Bring a Welder

1974 2002, 1965 Datsun L320 truck, 1981 Yamaha XS400, 1983 Yamaha RX50, 1992 Miata Miata drivetrain waiting on a Locost frame, 1999 Toyota Land Cruiser

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At Watkins Glen one year we had a gas leak in a showroom stock Honda.

A Fireman told us to rub Ivory soap on the hole to stop the leak. Worked for a least four days

when we pulled the tank to repair. Helped us finish the race.

The fat in the soap seals the tank, Ivory soap has some of the highest amount of fat in it.

Most bar soap will work.

Edited by jp5Touring
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I'm redoing my tank -it sat with gas in it for an extended time with gas in it after someone used what looks like the Eastwood kit on it, but didn't get all the rust out. Now it's a nasty mess of chewing gum and rust, I'm going to be going the tank renu method.

Koboldtopf - '67 1600-2

Einhorn - '74 tii

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I just got to my gas tank on my 68 yesterday that's been sitting for twenty years, Took a look and couldn't believe it was spotless on the inside. I think I dodged a bullet cause I was thinking it was going to be bad

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