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Unread 02-06-2013, 05:01 PM   #1
Bubba Ray
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Changing 20 gal. fuel tank to 15 gal.?

I have the stock plastic 20 gal. tank that is leaking for the third time. Thinking about changing to 15 gal. steel with the proper skid plate. Anyone done this? Any ideas would be helpful.

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Unread 02-06-2013, 07:58 PM   #2
86cj74.2L
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I replaced the factory 20 with a 15 gallon Polly tank from MTS.

It's been 5 or so years so I don't remember everything. But you will need a

factory 15 gallon skid plate
Factory 15 gal tank sending unit
A liquid check valve.
A roll over valve if you chose.
Possibly both fill and vent hoses between the tank and gas cap. MTS can confirm.

And of course everything I forgot to mention. If you go the mts route they have most everything you will need.

MTS guy I talked to many years ago is a jeep guy. Threw and threw. We spent 45 min chatting about jeeps before I even started placing my order and figuring out what else I needed that they didn't have.
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Unread 02-07-2013, 01:07 AM   #3
Cutlass327
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It's a shame you are so far away - I'd trade ya the leaky 15 gallon tank I have, it has the skid and straps all on it still (Tank and sender is junk, but the skid and straps are still good) for the skid for the OEM 20 gallon tank... I converted to the 20 gallon, but my skid is about rotted away on the one side.
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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Unread 02-07-2013, 09:10 AM   #4
PERK
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to bad Your so far away...I've got a 20 gal stock skid sitting here
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Unread 02-07-2013, 12:10 PM   #5
86cj74.2L
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Quote:
Originally Posted by Bubba Ray
I have the stock plastic 20 gal. tank that is leaking for the third time. Thinking about changing to 15 gal. steel with the proper skid plate. Anyone done this? Any ideas would be helpful.
You could try removing the tank and flushing it with water then melt the crack shut with a solder iron. Using a piece of black Polly pipe as filler material. But it will most likely crack somewhere else. That's why I just bit the bullet and got a new tank for the 86.
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Unread 02-07-2013, 03:20 PM   #6
clubbs
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I got a 15 gallon tank for sale in NC for $35, I think I have the skid plate and plastic liner thing too.

Dave
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Unread 02-09-2013, 02:12 PM   #7
Bubba Ray
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clubbs, I am way west of you but thanks anyway. The 20 gal. skid will be up for grabs after I am done.
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Unread 02-09-2013, 04:59 PM   #8
Bubba Ray
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86cj, I have fixed leaks in tank before and had them last a year or two. Tired of dropping that skid and tank to fix.
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Unread 02-09-2013, 05:04 PM   #9
86cj74.2L
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Quote:
Originally Posted by Bubba Ray
86cj, I have fixed leaks in tank before and had them last a year or two. Tired of dropping that skid and tank to fix.
Yep, agree 100%. I'm good at plastic welding. I road raced and crashed motorcycles in the 90's. but seeing the stress marks on the top of the tank where it sags when its not completely full I wasn't going through the aggravation.
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Unread 02-11-2013, 02:38 AM   #10
Bubba Ray
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So I need to order a steel tank, skid plate, and sending unit. Is that it? Any idea if stock gauge will work?
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Unread 02-11-2013, 01:53 PM   #11
86cj74.2L
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Quote:
Originally Posted by Bubba Ray
So I need to order a steel tank, skid plate, and sending unit. Is that it? Any idea if stock gauge will work?
The gauge in the dash is ok.

You will also need to find a liquid check valve that replaces the two round things inserted in grommets. And a rollover valve if you choose.

And possibly the two fill lines from the tank to the filler neck.
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Unread 02-11-2013, 03:50 PM   #12
PERK
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on a side note, those two round things in gromets on top of the tank are check valves for the 20 gal tank and are hard to find..keep them ..some one will buy them.
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Unread 02-11-2013, 06:47 PM   #13
Bubba Ray
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Thanks perk. I like to pass on any usable parts to someone that can use them.
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Unread 02-11-2013, 07:36 PM   #14
86cj74.2L
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I have a sending unit for one of those tanks too.
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