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Old 02-14-2013, 01:07 PM   #1
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87 YJ fuel sending unit question

Howdy All, Just signed up here, my son bought a 1987 Wrangler, straight 6 pretty much the same motor set up as a CJ, mechanical fuel pump, ect.
Noticed gas dripping from the skidplate under tank, checked it out and tank is rusted out, no problem, ordering a new tank.
My question is... the fuel gauge acts up so figured to order a new sending unit along with the tank but when I seen the price!
My CJ's sending unit is like 30 bucks, this 87 wranglers seem to start around $130!!??

Whats the diff?

Al

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Old 02-14-2013, 01:36 PM   #2
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Yeah I didn't replace mine. Reads full most of the time and when it gets to half it is time for gas. Trip set is handy and then the reminders turns when I lose the prime in the tank from being low on fuel. Always have at least 5 on the back so no issues. You can check the sending unit out with a meter 0 -95 ohms is what I remember but I have no idea how to adjust it firsthand. Someone here lately said it adjusted like the float in a toilet tank so take a look and give it a try.

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Old 02-14-2013, 03:25 PM   #3
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As long as you're replacing the tank it's a good idea to replace the sending unit and the mesh filter at the end of it. Probably at 130 you have a sending unit that also includes the screen. You'll also need a new gasket. It's a bit expensive, but at least your son will know how much fuel is actually in the tank and will be less prone to get stuck. Dropping the tank can be a headache, you might only want to do it once. Don't be surprised that you will most likely have to get new tank straps to go along with it. When you drop a 26 yr. old tank there is alot of collateral damage as a result of corrosion. And, the skid plate might have to go also. You might luck out but be prepared to replace more than just the tank.

This is less expensive. http://www.quadratec.com/products/55107_0100.htm As them about free shipping being a forum member.
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Old 02-14-2013, 04:29 PM   #4
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Thanks for the replies, will probably end up with new tank, sending unit and lines. I just wondered why the BIG difference in price of the sending units of two almost identical fuel systems, a cj 258 and a wrangler 258 (ie: both have Carter BBD carbs, mechanical fuel pumps, 15 gal tanks, ect.) Just didn't seem right.

Al




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Old 02-14-2013, 04:51 PM   #5
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4.2 6cyl. has a 20 gal tank. 2.5 4cyl. has the 15 gal. tank.
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Old 02-14-2013, 04:59 PM   #6
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Quote:
Originally Posted by kik View Post
4.2 6cyl. has a 20 gal tank. 2.5 4cyl. has the 15 gal. tank.
This looks very OEMish and it is a 15 gallon steel tank.

Al
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Old 02-14-2013, 08:11 PM   #7
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This looks very OEMish and it is a 15 gallon steel tank.

Al
Many have replaced an original 20 gal. tank with a steel 15 gal. replacement since they're approx. $200 cheaper. It sounds like the original tank was replaced. The 15 gal. steel tanks look oem. You can install either one. Most of the 20 gal. tanks were poly. However, there were running changes between 87 and 91. Depending upon the supplier and availability at the time either a poly or steel tank was installed. A problem having a 15 gal. tank with a 4.2 is you're constantly having to fill up with gas. If that's not an issue install a 15 gal. tank with a matching sending unit. It is a lot less expensive.

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