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Fuel Gauge Reading Incorrect

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Old 03-13-2012, 04:56 PM
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Default Fuel Gauge Reading Incorrect

I have a '92 Cherokee Sport I purchased about six weeks ago so I am still getting familiar with it. It has the 4.0L inline six and auto transmission.

One of the problems I have is that the fuel gauge registers 3/4 when it is full and after using about a 1/4 of a tank it registers 1/4 full. I've replaced the instrument cluster due to a separate issue with the speedometer fluttering and the problem is the same (with both instrument clusters). Is the sending unit a possibility? Has anyone had a similar problem?
Old 03-13-2012, 05:05 PM
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Since the fuel pump/sender is pretty easy to get to on the early XJs I would suggest crawling underneath and checking the connection and ground. Might also pull the pump to inspect the fuel level sender.
Old 03-13-2012, 05:16 PM
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Originally Posted by prerunner1982
Since the fuel pump/sender is pretty easy to get to on the early XJs I would suggest crawling underneath and checking the connection and ground. Might also pull the pump to inspect the fuel level sender.
X2
Old 03-13-2012, 05:53 PM
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Yup, good advice. This almost assuredly is a problem with the fuel gauge "sending unit".
Old 03-13-2012, 08:22 PM
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I replaced my fuel pump a while back and afterwards the guage now reads 1/4 less than what I actually have. My guess is the new fuel pump went in a little off clock angle. Mine mounts from the front side of the fuel tank.
Old 03-13-2012, 08:23 PM
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I replaced my fuel pump a while back and afterwards the guage now reads 1/4 less than what I actually have. My guess is the new fuel pump went in a little off clock angle which affects the height of the float. Mine mounts from the front side of the fuel tank.
Old 03-13-2012, 08:27 PM
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remove pump make sure float travels freely up and down completly in both directions
Old 03-13-2012, 11:53 PM
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I have to cram gas in my '92 to get it to register a little over 3/4 full.

I've not been able to squeeze more than about 16 gallons in it though. I thought it had a 20 gallon tank.

Low fuel light comes on at about 200-225 miles depending on terrain. You better put gas in it by 250 or so.
Old 03-14-2012, 12:40 AM
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Originally Posted by Firestorm500
I have to cram gas in my '92 to get it to register a little over 3/4 full.

I've not been able to squeeze more than about 16 gallons in it though. I thought it had a 20 gallon tank.

Low fuel light comes on at about 200-225 miles depending on terrain. You better put gas in it by 250 or so.
x2
Old 03-14-2012, 01:49 AM
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Originally Posted by Ian96XJ

x2
X3
Old 03-14-2012, 02:28 AM
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Originally Posted by freegdr
remove pump make sure float travels freely up and down completly in both directions
x2, if the pump was replaced, the float lever could be bent.
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