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Unread 12-29-2013, 08:00 PM   #1
Registered User
1983 CJ7 
Join Date: Dec 2013
Location: Enterprise, Al
Posts: 1
Fuel sending unit 120 ohms

Does anyone know why my fuel sending unit is transmitting 120 OHMS? The fuel gauge and the temperature gauge are both subsequently fried. How should I fix this? Has it happened to you? Help! I have an '83 CJ7.



Supercoolcj7 is offline   Reply With Quote
Unread 12-29-2013, 09:20 PM   #2
Registered User
1986 CJ7 
Join Date: Nov 2009
Location: California
Posts: 853
In your profile, it says you have a 4.0 in your '83 CJ. The 4.0 was offered in various configurations from '89-'05 or so. They were all fuel injected, and the vehicles they came from used different fuel sending units than the stock CJ. CJ's sending units were 10 Ohms when full, 73(ish) when empty. Fuel sending units from '91 on were 20 Ohm full, 270 empty.
If your 4.0 conversion included the fuel tank (or just the sending unit) from the donor, that sending unit is not compatible with the stock CJ fuel gauge.

Here's a link with further trouble shooting advice.
California 4.0 OBDII Engine Swap
SLO_Ken is offline   Reply With Quote

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