Fuel Gauge

[StuntMan]

Quite interesting I put the gear selector in to "D" and try starting up and I get two different readings on fuel gauge. Also when ever I fill up the fuel gauge still goes to no fuel marking and no fuel light goes on.

 

[stamp11127]

The sender in the fuel tank which indicates the amount of fuel has a resistance range from 22.5(low) to 145(full) ohms. As long as you can simulate that resistance range you will be able to test the gauge.
Need to know the year of the Expy to determine the correct wire to use.

 

[StuntMan]

The sender in the fuel tank which indicates the amount of fuel has a resistance range from 22.5(low) to 145(full) ohms. As long as you can simulate that resistance range you will be able to test the gauge.
Need to know the year of the Expy to determine the correct wire to use.

It's a 1999 XLT 4.6 V8. Thanks

 

[ExplorerTom]

It appears mine just started doing this.

Drove to the airport to pick up wife and kids. Got 17.8 mpgs on the total trip (Scangauge). Dropped them off and filled up with gas on my way back to work. Low Fuel light was on, 0 miles to empty was showing. Pumped nearly 24 gallons. Drove 11 miles to work and just as I was about to park, I noticed the low fuel light was still on and gauge was still showing empty.

Also my trip mpg on my Scangauge didn't reset.

The gauge energizes when the ignition is cycled: goes from the "dead" position to an attempt at an "empty" reading.

 

[z168]

Ive had this problem for years. Mine only goes up half way. Low fuel light comes on when I drive over 350miles

Hi Stamp, how do you simulate the resistance? I can measure resistance with my multimeter but how do I create the 145ohm? Got any easy or practical suggestions?

 

[Bedrck47]

you can go to radio shack and by a variable resistor or fixed resistors. There is a connector at the tank or there is a connector under the tube for the intake snorkel

 

[Bedrck47]

print this is for a 2001 but the 2000 is the same

 

[Bedrck47]

you would want connector C-148 see attached print again its from a 2001 but 2000 is the same

 

[Bedrck47]

Place the resistor between pin #1 and pin #10 It is a square connector under the intake snorkel

You will also notice from the prints that the sensor circuit has nothing to do with the PCM

 

[Bedrck47]

The bad news is the sender isn't a part that can be purchased separately. It is part of the hanger assembly which also includes the fuel pump. If you have anything over 100000 miles on the expy then it would be best to replace the assembly. Make sure that you try to get the tank as close to empty as possible before dropping the tank