Fuel gauge not working

Tiny
ED FUCHS
  • MEMBER
  • 2003 NISSAN MAXIMA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
Fuel gauge does not work shows full after starting car.
Monday, May 6th, 2019 AT 7:11 AM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like you have a short circuit within the fuel gauge circuit itself. When ever you have the positive and the negative shorted within a gauge's circuit, they will always peg out when voltage is applied to the circuit This is because the gauge instead of getting a lower voltage as it normally does, with the sensor acting a sort of variable resistor, is getting full battery voltage from the short circuit, pegging it. In the diagrams down below I have included the wiring diagrams for your vehicle's engine control circuits. The fuel sending unit and the wires you need to check for frayed insulation and causing a short circuit are all highlighted for you. Please go through these and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Monday, May 6th, 2019 AT 10:03 PM

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