Default How to clean out gas tank 

Old 07-29-2012, 03:25 PM   #1
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First, is it possible and if how so, how? I have my gas tank off the jeep and wanted to make sure it's clean inside and out before putting back on. Can I just spray a cleaner in there an let air dry?

Here a picture I snapped of the inside
imageuploadedbytapatalk1343586708.863160.jpg

Here is the outside of the tank
imageuploadedbytapatalk1343586760.497214.jpg

 

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Default Re: How to clean out gas tank 

Old 07-29-2012, 07:40 PM   #2
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If your not going to paint the interior with a liner of some type, the rust will come back. Have you looked into a poly tank? I went thru 2 steel tanks before I went poly and no more problems in 18 years.

To clean your tank, take a short length of chain and stick inside, then shake, shake, shake, your butt off. Dump it. Then take metal etch and etch the tank according to directions. Rinse out with warm water and allow it to dry. (torch to outside of tank usually helps) Then line it. Most tank liner products come with cleaner, etcher, and liner.
I have successfully used Kreem brand tank liner kits on a 26 gal pickup tank and 2 motorcycle tanks.

 

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Default Re: How to clean out gas tank 

Old 07-30-2012, 08:26 AM   #3
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On old military truck tanks we just put some gravel in and then strap the tank to a cement mixer and let it spin all day. Not too big of rock ought to work for a CJ tank.

 

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Default Re: How to clean out gas tank 

Old 07-30-2012, 12:42 PM   #4
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Quote:
Originally Posted by PaRenegade View Post
If your not going to paint the interior with a liner of some type, the rust will come back. Have you looked into a poly tank? I went thru 2 steel tanks before I went poly and no more problems in 18 years.

To clean your tank, take a short length of chain and stick inside, then shake, shake, shake, your butt off. Dump it. Then take metal etch and etch the tank according to directions. Rinse out with warm water and allow it to dry. (torch to outside of tank usually helps) Then line it. Most tank liner products come with cleaner, etcher, and liner.
I have successfully used Kreem brand tank liner kits on a 26 gal pickup tank and 2 motorcycle tanks.
Thanks for the info. I have looked at the poly tanks and really do like them. Were most 76-86 CJ's 15 gallon? I was looking at the 15 gal poly tank but then also noticed they have a 20 gal.

 

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Default Re: How to clean out gas tank 

Old 07-30-2012, 01:51 PM   #5
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Austin, everything is give and take. The poly tanks will not rust, but theres always something that can get thru the filters at the gas pump. The later oem CJ tanks were 15 gal. with a 20 gal. option. I am not sure how a poly tank will do in the rocks, but that depends on what kind of driving you do. The 20 gal. does hang down a bit more also, so take your pick.

 

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Default Re: How to clean out gas tank 

Old 07-31-2012, 08:50 AM   #6
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I put a 21 gallon poly in mine, and it's about 3 1/2" lower than the stock 15 gallon tank. Before I lifted my 8 the rear diff would rub on the tank mount/skid plate on rough terrain.

 

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Default Re: How to clean out gas tank 

Old 07-31-2012, 03:56 PM   #7
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Remember one of the most important parts to the gas tank/skid plate system is the foam pad between the bottom of the tank and the skid plate to prevent rocks from becominglodged between the two and puncturing the tank.

 

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Default Re: How to clean out gas tank 

Old 08-01-2012, 09:38 PM   #8
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I ordered a new steel 15 gal tank today. I was trying to clean out the other one and noticed the fuel pick up lines had basically crumbled. Picked up a new fuel sending unit, lines, filter and hoses as well. Any suggestions on a good coating I can put on the steel tank to keep it from rusting? I picked up por-15 for all the other metal parts?

 

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Default Re: How to clean out gas tank 

Old 08-05-2012, 03:08 PM   #9
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Sorry I didn't reply sooner. I've been on vacation this past week. Yes I would use POR on the tank and the skid. Saddletramp mentioned about the foam pad, mine was a plastic piece shaped like the tank bottom half; being important to use and I agree. The down side is that it can trap water and rust the tanks bottom. This is what happened to my first 2 tanks before I switched to a poly one. So paint it well. And yes mine was a 15 gal. one. I didn't spring for the 21 gal. option initially so I'd have had to get a new skid plate also.

 

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Default Re: How to clean out gas tank 

Old 06-07-2013, 03:00 PM   #10
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Quote:
Originally Posted by PaRenegade View Post
Sorry I didn't reply sooner. I've been on vacation this past week. Yes I would use POR on the tank and the skid. Saddletramp mentioned about the foam pad, mine was a plastic piece shaped like the tank bottom half; being important to use and I agree. The down side is that it can trap water and rust the tanks bottom. This is what happened to my first 2 tanks before I switched to a poly one. So paint it well. And yes mine was a 15 gal. one. I didn't spring for the 21 gal. option initially so I'd have had to get a new skid plate also.
I have the 20 gallon plastic tank... I dropped the tank, cleaned the metal skid plate container, painted the outside of the skid plate and cleaned the outside of the tank.

I have noticed inside the tank there is a significant amount of dirt, rust and debris.

Do you have any suggestions on what I should use to clean the inside of the tank? Can I use the same method you used for the metal tank and maybe rinse with brake cleaner? thanks.

 

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