YJ/CJ Fuel Gauge Compatibility ?'s - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-07-2003, 08:09 PM Thread Starter
 
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YJ/CJ Fuel Gauge Compatibility ?\'s

Hey everybody. I'm almost done with my CJ dash swap.. I've wired everything, everythings bolted in - with the exception of the fuel gauge.

I remember reading somewhere that the resistance values for a CJ and YJ are pretty close to each other - only they're flip-flopped... IE a YJ might be like 0 ohms @ full, and 80 ohms @ empty. A CJ, on the other hand, would have 80 @ full and 0 @ empty.

Does anybody have these exact values? If they're pretty close to being a dead-on flip flop, i can just reverse the leads on the back of the gauge, correct? That will send power to the opposite magnet in the gauge, thus swinging the needle in that direction...

Any help is greatly appreciated.

-pablo
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post #2 of (permalink) Old 10-07-2003, 10:40 PM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

1. YJ Gague Resistance:[*] 0 ohms =full,[*] 44=1/2 and,[*] 88 = empty.
1. CJ Gauge Resistance:[*] 73=empty, [*] 9 = full
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post #3 of (permalink) Old 10-08-2003, 09:25 AM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

LEVE is correct. And yes, the readings are reversed.

No you can't reverse the leads on the back of the gauge. The 12V terminal powers a mechanical regulator inside the fuel gauge which also powers the temp guage.

When I installed the YJ tank/sender in my CJ I tried several things to reverse the readings but was unable to. Instead, I removed the fuel gauge and made new lables to cover the original F and E, (F became E and E became F). It took a little while to get use to them being switched but after 2 years now it seems normal to me. The gauge stays at full longer and when it hits empty I have approx 4 gallons left.

Gary
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post #4 of (permalink) Old 10-08-2003, 09:44 AM Thread Starter
 
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

Thanks for the help guys.... Question # 2 - Can I just swap in a CJ sending unit? Will it fit in my 15 gallon YJ tank?
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post #5 of (permalink) Old 10-08-2003, 11:06 AM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

I'm not sure about the tank for the YJ with a 6-cylinder, the sender might be the same size as the CJ's.

When I switched from the external fuel pump to the in-tank pump for my 4.0L conversion I read several tips on using a 87-89 YJ 4 cyl efi fuel tank (15 gal) and sender to replace the CJ 15 gal tank. I was unable to find any used parts so I bought a new tank from 4WDH. The sender opening in the new YJ tank was larger than the CJ sender so I could NOT use the CJ sender and had to buy the YJ sender.
I would try and drop the back of your tank and see what size the sender is and compare it to a CJ sender.

Gary
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post #6 of (permalink) Old 10-08-2003, 11:10 AM
 
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

You need to switch the leads coming off the wiper coil on the sender unit to get the gauge to reverse. This will get you close, according to a guy I figgered this same question out with.
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post #7 of (permalink) Old 10-08-2003, 11:21 AM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

1. Jaffer, that is one approach to the problem that would work,
2. Did you silver soder the new wiring in place?
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post #8 of (permalink) Old 10-08-2003, 05:00 PM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

When I put the CJ dash in my YJ, I just made the CJ gauge E into an F with a black pen, and made the F into an E with some white-out.
Works ok enough for me.
Good luck
Pete
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post #9 of (permalink) Old 10-08-2003, 09:16 PM
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

I've learned to live with the backward gauge. Mark where empty happens on the way to full. I also carry a five gallon tank of gas on the swing out tire carrier.
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post #10 of (permalink) Old 10-09-2003, 12:06 AM
 
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Re: YJ/CJ Fuel Gauge Compatibility ?\'s

I didn't ask how the guy I suggested this idea too re-attached the ends ...
I'm a master silver smith and I think silver soldering (brazing) such a tiny wire would take considerable skill.
A 4% "silver bearing" soft solder should do the trick.
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