Posted by Bob on March 02, 2014 at 21:42:30 from (64.255.159.192):
In Reply to: OT: Pickup fuel guage posted by Tim in OR on March 02, 2014 at 20:46:43:
IMHO, the problem is at least as likely to be a failed "stepper motor" in the gauge cluster.
The sender works just like they have since the dawn of the electric gas gauge... the resistance between it's terminal and chassis ground varies as the float rises and falls.
I do NOT have exact resistance values at hand, but if you can disconnect harness from the fuel module and figure out which is the sender wire, and turn the ign swiutch "ON", and look at the gauge, then GROUND the sensor wire at the body-to-fuelsender connector, "OPEN" the gauge should move to either "E" or "F" and when you ground it, go to the opposite extreme.
If it works like that, it's pretty likely the sender has failed.
If the gauge does NOT swing, there's a stepper motor, electronics, or wiring issue.
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