fuel gauge sender
Senior User
Joined: Nov 2003
Posts: 186
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From: Over here
If you are talking about when you fill up, it usually goes past the marks on the dash face. Otherwise it can mean that it is grounded, this is one way you ck to see if the dash unit and the wire is good, touch the wire to a ground to see if it moves the dash needle.
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Senior User
Joined: Nov 2003
Posts: 295
Likes: 2
From: Vancouver
It was a new rear tank and sender unit put in, the needle pegs out as soon as the ignition is switched on. After looking at a wiring diagram, it looks like there is an inadvertant ground somewhere and the gauge ground it not being controlled through the sender rheostat. I though maybe the tank has to be isolated from ground, but after checking another truck, that doesn't seem to be the case.
Elder User
Joined: Mar 2004
Posts: 517
Likes: 2
From: Texas
I have fought this problem many times on other Ford trucks with dual tanks. I still am not absolutely sure how I fixed them each time but after changing the pump/sending unit, the fuel gauge would go way past full and stay there until a considerable amount of fuel was consumed, then it would start working. Yes, I made sure it was the correct pump/sending unit.
I seem to remember that there is a baffel (anti-slosh) built into the tank and it is possible to scrape this with the level sensor during installation. I did remove and replace the same units until I got them right, and I also remember spending way too much time at it.
I seem to remember that there is a baffel (anti-slosh) built into the tank and it is possible to scrape this with the level sensor during installation. I did remove and replace the same units until I got them right, and I also remember spending way too much time at it.
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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Mar 8, 2001 11:06 PM
