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Fuel gauge problem.


Ogonz9494

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For a while now the fuel gauge on my 92 i4 ranger stopped reading correctly. Now when truck is on it usually reads over full and goes back down while driving and then back up. The truck has a brand new fuel pump and had this problem before I installed it, I thought it would fix the issues as well but it didn't.
Has anyone had this problem and a fix for it?
 


RonD

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Google: ford ranger anti-slosh module

That is one common problem, this module prevents gauge from swinging up and down every time you go around a corner and gas sloshes from side to side in the tank

1989, and up, Ford fuel gauges and senders(float in the tank) use:
10 ohms Empty
158 ohms Full

Behind the dash is a 5volt pulsing power supply that powers the fuel gauge, if gauge works at all then this is OK.
The anti-slosh module is also on back side of dash.
Then there is a Yellow/white stripe wire that runs from the dash to the sender in the fuel tank.

So 158 ohm is high resistance, or NO connection, so if yellow wire had intermittent connection then gauge would go to Full when yellow wire lost connection then read correct level when it had a connection.

A short to ground is 0 ohms, no resistance, so a short on yellow wire would show Empty

So my guess would be yellow wire has a loose connection somewhere or Slosh module does.

The sender also needs a good ground, a loose ground could show same symptom, sender can be grounded at frame near the tank, same ground point as Fuel pump ground, or it can be grounded in the cab, passenger side foot well usually.
 

Ogonz9494

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Hey Ron thanks for the info man! Seems like you know your stuff, I'm going check that out this weekend and get back with you. Thanks a ton!
 
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