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Old 10-07-2011, 05:14 AM   #1 (permalink)
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How do I clean out my gas tank?

My fuel filter is picking up a lot of crap. I have had a look just down the neck of my gas tank, there seems to be a lot of corrosion inside the tank. What is the best way of cleaning this out? I was thinking of putting a wire brush in to clean inside the neck but then all the crap would fall in to the bottom of the tank.

Appreciate any help.
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Old 10-07-2011, 07:54 AM   #2 (permalink)
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Re: How do I clean out my gas tank?

I've never had any luck at cleaning out and reusing an old tank, even tried having them boiled at radiator shops and so forth. However, I have a buddy who claimed success, though he never drove his old truck, by removing his tank, putting in pea gravel, taping the holes and vigorous shakings for days and then he used some gas tank liner that you pour in. I can't recall what he said it was called, for some reason my mind is thinking "red seal" or something along those lines. Nearly every old car I've ever fooled with has needed a new gas tank and sending unit if they've ever sat much. I guess the gas tank and sending unit for my 67 was somewhere around $300 or so off ebay. Think that's where I recall getting it. Maybe $350 at most.
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Old 10-07-2011, 11:38 AM   #3 (permalink)
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Re: How do I clean out my gas tank?

Fill it with sharp gravel like above. Or a large quantity of nutz and boltz or even 10 feet or so of 5/16" steel chain.

Shake the schitt out of it, empty it, Wash it out with water, then dry it out with Methyl Ethyl Keytone (MEK) or Acetone.

Get a Quart of Fuel Tank liner (100% pure non colored Urethane), Tape off all the holes, pour in the quart of Urethane, slowly Roll the fuel tank in all directions coating the entire inside of the tank.

Once all is coated, remove some tape and pour the excess back into the quart container and re-seal.

NO activator is necessary, allow 12 to 24 hours cure time for the urethane.

Gasoline and diesel have NO effect on it whatsoever and you never have to worry about your fuel tank again.
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Old 10-07-2011, 05:59 PM   #4 (permalink)
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Re: How do I clean out my gas tank?

This is what I used. Can't go wrong with anything from POR 15.
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Old 10-07-2011, 07:07 PM   #5 (permalink)
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Re: How do I clean out my gas tank?

$39 bucks for a Quart of Urethane is a bit much, but if it's all you can get a hold of then go for it.
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Old 10-07-2011, 07:37 PM   #6 (permalink)
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Re: How do I clean out my gas tank?

awsome advice, thanks team. I feel a lot of shaking coming on.
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Old 10-07-2011, 07:39 PM   #7 (permalink)
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Re: How do I clean out my gas tank?

Good Grief! Now I got Jerry Lee stuck in my head! LOL
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Old 10-07-2011, 09:26 PM   #8 (permalink)
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Re: How do I clean out my gas tank?

Make sure the lines don't have rust in them. I went through this on a pickup a while back. We even went so far as to put a new tank in and the filter kept filling up with rust. We had to change all the lines to stop this. When I cut the line open it was almost stopped up in a couple places due to rust.
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Old 10-07-2011, 11:38 PM   #9 (permalink)
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Re: How do I clean out my gas tank?

damn that's great advice (about the lines) , man I love this website, thanks
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Old 10-07-2011, 11:39 PM   #10 (permalink)
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Re: How do I clean out my gas tank?

Quote:
Originally Posted by FEandGoingBroke View Post
Good Grief! Now I got Jerry Lee stuck in my head! LOL
Damn, I didn't but I do now. Karma coming back to bite me I guess, lol
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Old 10-07-2011, 11:47 PM   #11 (permalink)
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Re: How do I clean out my gas tank?

The last one we cleaned was a few years ago, but we used 2 handfuls of lugnuts. We had just hauled off a car and we had to pull the wheels off. The lugnuts were just laying there. It knocked a lot of stuff loose. I am going to clean my tank soon and I get to go through all of this. I already have the urethane and the MEK. I am going to pressure wash the inside of mine first to break loose the big stuff and then shake it with a chain or lugnuts in it. If I had the money I would just buy a new gas tank, but money is tight this time of year.
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Old 10-09-2011, 01:21 AM   #12 (permalink)
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Re: How do I clean out my gas tank?

I had a Maxwell gas tank that gave me rust problems, I used that gravel approach and shaking to loosen the rust flakes, washed it out with water and dried it out letting it sit in the sun and warming it with a heat gun on low. Then I used this stuff that came in a kit by the Eastwood Brothers. It was sold at swap meets and I think I paid $20 or so and it did one large tank. Never gave me a lick of trouble for the 15 years I owned the car.

Did the same thing on a gas tank for a 1955 Fairlane. That constant rust is irritating. Beware it will destroy the little diaphragms real quick in a fuel pump. If you put one of those little glass fuel filters (glass tube looking thing with chrome ends and a micron filter inside - it comes apart and you can clean it then put it back together each time) on your line before it reaches your pump, you'll never had a dead pump from rust.
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Old 10-09-2011, 08:40 AM   #13 (permalink)
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Re: How do I clean out my gas tank?

I used ther POR15 sealer on ours back in 03/04. so far so good. when I poured it out, I brushed that on the outside of the tank too, color looks like galvanized, but shiny, figured that would seal up the seams so it couldnt rust back up under the sealer from the outside.
Figured why not, as POR cant be saved once exposed to air, it will solidify in the can with any humidity exposure, o dont open the can till ready to use it.

POR is also odd that while it dont look thinner than other paints, it creeps everywhere, as if it were alcohol thin...get a drop on your shirt, you'll have a 6" spot on your skin that takes a month to wear off- it is THE messiest material Ive ever worked with, as you pretty much cant clean it up- I put a big old tarp down for the tank, as it dripped out the holes and off the outside for a while before it set. had it set on the flanges up on sawhorses angled to drain...take the time to arrange a 'drain position' stand to flop it up on before untaping the holes, but expect some sealer leaks, and a big mess...

POR recommended phosphoric acid etch(they call theirs 'marine clean' IIRC) before final rinsing and coating. dont think anything STOPS existing rust faster than a phosphoric acid etch, and dont think theres many sealers that adhere as well as POR stuff over rusted/etched metal. just dont think of putting it over paint, it wont bite at all...on etched steel you need a grinder to remove it.
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Old 02-03-2012, 10:04 PM   #14 (permalink)
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Re: How do I clean out my gas tank?

do you have to remove the fuel sender unit before doing the POR treatment? I bought a box with 3 liquids in it, it's a 3 step process. A prep, a treatment and a sealer
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Old 02-04-2012, 08:24 AM   #15 (permalink)
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Re: How do I clean out my gas tank?

I used Red Kote tank sealer on my 72 truck, working great! Bought it at O'Reilly's
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