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Fuel gauge problem

  #16  
Old 12-23-2010, 08:14 PM
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I've done some searching and havent ran across this same problem. My fuel gauge works but only half way. If I fill up the tank it will show a little above half a tank. When it's empty (or as close to it as I'm brave enough to run it) it's below the "E". So the gauge works... just not quite like it should. The fact that it doesnt work right drives me nuts. Any ideas from the pros?
 
  #17  
Old 12-24-2010, 04:18 PM
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It could be that the brass float has a small leak and fuel has got inside of it. Or maybe the sending unit came loose inside the tank. Either way you have to drop the tank and take a look inside and that would be a good time to see if the tanks rusting where the straps hold it in place.
 
  #18  
Old 12-24-2010, 04:35 PM
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similar question, my gauge worked fine till about a week ago. now when i first start the truck it pegs wayyyy below e, then it will go up to the correct amount in the tank at the time, then back to below e. im lost. i did notice i have a small leak but idk if that would have anyting to do with the gauge
 
  #19  
Old 12-24-2010, 06:55 PM
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Originally Posted by big78f150 View Post
similar question, my gauge worked fine till about a week ago. now when i first start the truck it pegs wayyyy below e, then it will go up to the correct amount in the tank at the time, then back to below e. im lost. i did notice i have a small leak but idk if that would have anyting to do with the gauge
That might be as simple as a bad ground wire back at the tank The leak won't have anything to do with the gauge but definitely fix it.
 
  #20  
Old 12-24-2010, 07:49 PM
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didnt think it was. gonna take it to the radiator shop and have them clean it and seal everything. and was gonna put a new sending unit in the tank just cause it was out. but it gonna have to wait till it warms up some lol
 
  #21  
Old 04-21-2014, 10:13 AM
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fuel guage

im having same prob.fuel guage and dash lights dont work.took off the dash but there are no wires to the gas guage all the wire go to a harnes that goes into the dash cluster.what wire controls fuel guage?77 ford f100
 
  #22  
Old 04-22-2014, 12:59 PM
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2 things:

1. Did you check the float like what was mentioned in this thread?

2. Why tack on to a 4 Year old thread? You'll get a lot more responses if you start your own.
 
  #23  
Old 08-18-2014, 12:46 PM
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I need help with my gas gauge , it just sits below E never moves . Is it a bad ground ? A bad gauge ? or something in my tank ?
 
  #24  
Old 08-18-2014, 12:56 PM
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Originally Posted by alanblueeeee View Post
I need help with my gas gauge , it just sits below E never moves . Is it a bad ground ? A bad gauge ? or something in my tank ?
Welcome to FTE. Lot's of good people.
Does your temp gauge work okay? Temp and Fuel both use the same regulated power source (5.5 V).
If the temp is okay, crawl under your truck and unplug the sending unit. The plug has two wires going to it. One goes to the gauge, the other goes to a ground. Turn your ignition to the "on" position. Ground the wire that goes to the gauge and see what the gauge does. If the gauge and wiring are good, the gauge should swing over to Full.
If it swings to Full, then either the sending unit is bad or there is a bad ground point after the sender, check the wire and ground point, it's directly in front of the sender, on the crossmember.
If when you ground the wire, the gauge still doesn't move, you'll need to get a multimeter and start checking for power and continuity in the gauge and circuit.
 
  #25  
Old 08-18-2014, 01:01 PM
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i beilive the temp gauge works fine , but when i first bought the truck it would come on at random while driving then go away , so do you think its a bad ground ?
 
  #26  
Old 08-18-2014, 01:17 PM
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Originally Posted by alanblueeeee View Post
i beilive the temp gauge works fine , but when i first bought the truck it would come on at random while driving then go away , so do you think its a bad ground ?
I doubt it. On the temp gauge, the ground is the sending unit. Check to see if the wire that is connected to the sender is a tight, clean connection.
Other than that, do the troubleshooting that I posted above. You should be able to diagnose it.
 
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