Will an 89 YJ fuel tank fit a 94 yj? - JeepForum.com
 
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post #1 of 14 Old 07-30-2019, 03:43 PM Thread Starter
Fishstic
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Will an 89 YJ fuel tank fit a 94 yj?

Straight forward question, need to replace my fuel tank, there's an 89 YJ tank that's $40 but I wanna know if it will fit a 94

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post #2 of 14 Old 07-30-2019, 04:19 PM
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It will fit but fuel pumps are different

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #3 of 14 Old 07-30-2019, 09:22 PM
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Originally Posted by Fishstic View Post
Straight forward question, need to replace my fuel tank, there's an 89 YJ tank that's $40 but I wanna know if it will fit a 94

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Why would you do that! The plastic is way better. What's wrong?

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post #4 of 14 Old 07-30-2019, 10:01 PM
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Why would you do that! The plastic is way better. What's wrong?

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The OE 20 gallon tank in my '89 is plastic, FWIW.

'89 YJ "Night Eagle" 4.2 5spd, Spinnaker blue/grey, hard top and doors, mostly stock and RUST FREE!!
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post #5 of 14 Old 07-30-2019, 10:07 PM Thread Starter
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Why would you do that! The plastic is way better. What's wrong?

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What else would be wrong?

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post #6 of 14 Old 07-31-2019, 06:51 AM
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The vent tube or the connections for the supply or return line. I seriously dont think you have a bad tank. You need to drop it to look at it better.

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post #7 of 14 Old 07-31-2019, 01:37 PM
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The OE 20 gallon tank in my '89 is plastic, FWIW.
That's because all of the 20 gallon tanks were plastic. The only true 15 gallon tanks were the 87-90 (or maybe '91) metal tanks. After that they were all the poly 20 gallon tanks, and some were restricted down to 15 by the vent tube so they could charge you more for something they already put in there.

I agree with Que, I'd certainly drop it and see what you've got going on before buying another tank.

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post #8 of 14 Old 08-01-2019, 09:03 PM
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Quote:
Originally Posted by timatoe View Post
Quote:
Originally Posted by Mechman71 View Post
The OE 20 gallon tank in my '89 is plastic, FWIW.
That's because all of the 20 gallon tanks were plastic. The only true 15 gallon tanks were the 87-90 (or maybe '91) metal tanks. After that they were all the poly 20 gallon tanks, and some were restricted down to 15 by the vent tube so they could charge you more for something they already put in there.

I agree with Que, I'd certainly drop it and see what you've got going on before buying another tank.
My steel tank I pulled for a plastic 20 would only take 13 when I had to run the starter to get up to the gas pumps lol

Honestly at this point I’d consider going back to 12 gallons if someone made one with the 20 gallon footprint but 3 or so inches shorter! I’m thinking about a Cherokee as DD and 12/13 is enough for something more trail-centric. I’d prefer my rear shackles to drag first

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #9 of 14 Old 08-02-2019, 04:51 PM
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I just went the opposite way last weekend. Put my 94 tank into my 87. Both Jeeps have 20 gallon poly tanks. The big difference I saw was the 94 tank has a baffle inside that surrounds the fuel pick up. The 87 tank had nothing in that place so fuel pickup with lower fuel levels and slopes or acceleration for instance may be an issue.

Another thing with this swap, unrelated to the OP but noteworthy. My 87 is carbureted. The fuel sender that was original to this would in no way fit a newer tank with the baffle in it. The float arm is not configured correctly to work with the baffle. I had ordered a replacement tank unit from quadratec due to my sender being no good. The replacement sender is a fuel injected version minus the fuel pump. It comes with a rubber hose and tank pickup to go on in place of where the pump would be. This is an upgrade IMO because now I have a baffle surrounding my pickup screen to help with starvation and feed issues. It worked out for the better.

If you go from steel to poly or vice versa the filler neck hoses are most likely different.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #10 of 14 Old 08-03-2019, 06:20 AM
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Some 20 gal carburetor tanks have the same rectangular pattern hole on the top but had/have a fuel pickup and sender only. My 12 gal steel tank pump (tbi 2.5) wouldn’t fit a newer pump-in-tank as it was round. My first 20 gallon was from a 4.2 (1990?) and it took the fuel pump from a ‘93 2.5. (That’s what I’m running now with the 4.0)

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #11 of 14 Old 08-03-2019, 08:10 AM
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Originally Posted by fishadventure View Post
Some 20 gal carburetor tanks have the same rectangular pattern hole on the top but had/have a fuel pickup and sender only. My 12 gal steel tank pump (tbi 2.5) wouldn’t fit a newer pump-in-tank as it was round. My first 20 gallon was from a 4.2 (1990?) and it took the fuel pump from a ‘93 2.5. (That’s what I’m running now with the 4.0)
Good point. I forgot to mention that all three of the tanks I have are the rectangular pattern hole in the top.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #12 of 14 Old 08-03-2019, 02:12 PM
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Yeah, the steel 15 gallon I pulled was a round opening, the 20 gallon poly (from an '87 4 banger) was rectangular.

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post #13 of 14 Old 08-17-2019, 02:48 PM Thread Starter
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Hey boys, sorry for the wait, here was my issue.

There were bits of rock and metal in parts of the tank, probably from all the rusted pieces and dirt flakes scraping between the skid plate and the tank, replaced the whole tank and bought a brand (slighty used) new pump just to make sure. Luckily I found someone of eBay who was selling a 20 gallon tank on eBay for 180$

Advance Auto parts was trying to sell me one for 800$

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post #14 of 14 Old 08-17-2019, 02:49 PM Thread Starter
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Also I was taking a small vacation, just got out of school so I wanted to take a week off before I get to working.

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