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Jeep Comanche MJ (1985 - 1992) Jeep's Cherokee-based compact pickup technical forum.

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Old July 15th, 2022, 22:20
DanDXJ DanDXJ is offline
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Plastic Fuel Tank for 1990 MJ

Does anyone know if there is a plastic fuel tank available for a Short Bed 1990 MJ ?
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Old July 18th, 2022, 13:41
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Goose_XJ88 Goose_XJ88 is offline
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Location: Sacramento, CA
Posts: 1,560
Re: Plastic Fuel Tank for 1990 MJ

I dont think so. the only Plastic tank swaps I have heard about are 97+ XJ tanks where the factory spare sits and Dakota tank swap. But to my understanding, bot of those require the newer 97+ sending units and they are a returned system where the earlier versions are return-less I think.

I dont have any experience with any of it, just blurry rememberings of skimming through threads and whatnot over the years.
88 XJ Laredo 8" RE SA, drop brackets, 35s D30/44 4.56, AW4, 242, 7100s, Logan’s ft winch bumper, JCR swing out tire carrier, JCR sliders, 96 booster, 97+ mirrors & console (FOR SALE)
99 XJ Limited, AW4, 242, Colombia Edition WJ Seats, Stock. Future 4.5" lift, TnT LA, 33s armor, 231 SYE, D30/44 4.56, rear locker, etc
93 XJ 2 Door AX-15 D30/8.25 3.55 swap, (SOLD)
92 MJ AW4 2wd, 97 mirrors. Future 4wd swap, 242, MJ 44, Eliminator Roll bar, Bucket seats, 97+ console
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Old July 19th, 2022, 11:18
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Bent Bent is offline
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Location: REDLANDS, CA. (SoCal)
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Re: Plastic Fuel Tank for 1990 MJ

Definitely have not seen a plastic tank for the MJ.

Not a fan of aftermarket tanks for the MJ.

1- There is no mounting point for the bottom of the fuel pump assembly. Its a standoff with a hole in it to reduce stress the pump frame assembly. There is a pin at the bottom of the pump frame.

2- Leaks out the filler tube when side hill. Never did it with the OEM tank.

I'm going to take my OEM tank in for cleaning and possibly coating. I could do it myself but it's a matter of free time with so many other fish to fry.
Gravity is a fickle mistress.
Ethan: "What did you think would happen?"
'01 XJ • 4.0 • AW4 • 231 • Modified
'87 MJ • 4.0 • AW4 • 231 • Stock-ish
- SoCal Chapter President -

Last edited by Bent; July 19th, 2022 at 11:22.
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Old August 8th, 2022, 23:43
RickDT RickDT is offline
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Location: GA
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Re: Plastic Fuel Tank for 1990 MJ

My friend is looking for an aftermarket tank for his new MJ project, too bad there are no better options around than the OEM. We'll take a closer look at the tank leak next week after we installed the rotors and tis wheels on the truck and clear the garage.
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