Fuel gauge not working properly, it always shows half full

Tiny
MATT PRICE
  • MEMBER
  • 2000 FORD RANGER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 152,000 MILES
My son went off to college and left me his truck. He said that the gas gauge does not work any more and it's stuck on half a tank, well, he's right.

I have replaced the Fuel Pump with the Sender Unit, checked the grounds in the rear, put a new cluster in it, and have re-grounded the ground wire.

What happens if I take the connector out of the back of the instrument cluster that controls that side of the cluster, the fuel level pegs full over to the other side.

When I plug it back in, it goes to full. And when I shut the motor off and restart, it goes to half a tank.

With three fuel pumps, and taking them out and testing them - it's not the float. So, anyone have any ideas? I have no idea at this point in where to look to start doing PD.
Thursday, January 14th, 2021 AT 10:30 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Based on your description, there is an existent short that is completed when you reconnect the gauge.

____________________

To get started, I need you to go through the following flow charts for diagnosing the issue. See if this helps.

____________________

2000 Ford Truck Ranger 2WD V6-3.0L VIN U
Test A: Incorrect Fuel Gauge Indication
Vehicle Instrument Panel, Gauges and Warning Indicators Testing and Inspection Pinpoint Tests Pinpoint Tests - Instrument Cluster Test A: Incorrect Fuel Gauge Indication
TEST A: INCORRECT FUEL GAUGE INDICATION
A1 (part 1 Of 2)

pic 1

A1 (Part 2 Of 2)

pic 2

A2 - A4

pic 3

A5

pic 4

A6

pic 5

____________________________

Let me know if this helps.

Joe
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Friday, January 15th, 2021 AT 5:18 AM

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