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Erratic Fuel Gauge

Bruce69
Posts: 55
Joined: Wed Apr 04, 2018 2:16 pm

Erratic Fuel Gauge

Postby Bruce69 » Sat Jul 21, 2018 10:07 pm

Has anyone else suffered from a fuel gauge that is sometimes erratic?

Is it the gauge or the sender?

:?:
XJ40 3.2 LPG 1991 47k
Jeep Grand Cherokee Overland 4.7 V8 HP LPG 2002
Merc CLK230 Kompressor LPG 2000
Dodge Charger R/T 1969

Bruce69
Posts: 55
Joined: Wed Apr 04, 2018 2:16 pm

Re: Erratic Fuel Gauge

Postby Bruce69 » Sat Oct 13, 2018 10:12 pm

So, again today I filled the petrol tank and after parking to do the weekly shopping I set off for home. It was at this point I noticed the low fuel warning light and the fuel gauge reading practically zero!

After 1 mile the low fuel light had gone out and by the time I'd got home (3 miles) it was reading just over half tank. :!:

Is the fuel sender a simple float and rheostat arrangement?

I wonder if because it so seldom is up at Full that the resistance has built up in that region of the rheostat.
XJ40 3.2 LPG 1991 47k
Jeep Grand Cherokee Overland 4.7 V8 HP LPG 2002
Merc CLK230 Kompressor LPG 2000
Dodge Charger R/T 1969

darrenwgaransi+
Posts: 66
Joined: Thu Nov 24, 2016 5:58 am
Location: Hamilton Square, New Jersey
Contact:

Re: Erratic Fuel Gauge

Postby darrenwgaransi+ » Wed Oct 17, 2018 2:32 am

The rheostat section on the fuel sender has gone bad. The are relatively inexpensive and easy to replace from inside the trunk. I changed mine a couple years ago for the same exact reasons.
Darren W. Garansi
1993 XJ6, 4.0

SovverBovver
Snr Member
Posts: 400
Joined: Sun Apr 19, 2015 10:36 pm
Location: In a garage

Re: Erratic Fuel Gauge

Postby SovverBovver » Fri Oct 19, 2018 3:56 pm

I have the same problem with my car. The section sending information from half to full is faulty whereas the section sending information about the empty to half full level is ok. I have a new sender to fit when I get some spare time.

Reading that paragraph above reminds me of the saying about glass half full, glass half empty...
1992 Jaguar Sovereign

Bruce69
Posts: 55
Joined: Wed Apr 04, 2018 2:16 pm

Re: Erratic Fuel Gauge

Postby Bruce69 » Mon Oct 22, 2018 8:15 am

SovverBovver wrote:I have the same problem with my car. The section sending information from half to full is faulty whereas the section sending information about the empty to half full level is ok. I have a new sender to fit when I get some spare time.

Reading that paragraph above reminds me of the saying about glass half full, glass half empty...

Over the past week I came to the same conclusion, the reading of the tank from half to full is bad. Mostly, the fuel gauge would not go much above half but this morning it went straight to full and then gradually dropped to 3/4.

Either way, it sounds like a new sender is required.

Thanks for the advice guys.
XJ40 3.2 LPG 1991 47k
Jeep Grand Cherokee Overland 4.7 V8 HP LPG 2002
Merc CLK230 Kompressor LPG 2000
Dodge Charger R/T 1969

muzz
Posts: 28
Joined: Sat Dec 31, 2016 5:07 am
Location: Sydney

Re: Erratic Fuel Gauge

Postby muzz » Sun Oct 28, 2018 6:22 am

I pulled my sender out of the tank and cleaned of the surface rust, cleaned the contact and changed the rubber gasket, all good now.

Bruce69
Posts: 55
Joined: Wed Apr 04, 2018 2:16 pm

Re: Erratic Fuel Gauge

Postby Bruce69 » Tue Oct 30, 2018 2:30 pm

muzz wrote:I pulled my sender out of the tank and cleaned of the surface rust, cleaned the contact and changed the rubber gasket, all good now.

Rust? I didn't imagine the resistive track to be steel but good to know a simple option exists. Thanks muzz.

Just got to wait for the fuel level to lower before I can open it up!
XJ40 3.2 LPG 1991 47k
Jeep Grand Cherokee Overland 4.7 V8 HP LPG 2002
Merc CLK230 Kompressor LPG 2000
Dodge Charger R/T 1969


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