Full tank of gas, yet guage and light says empty?! - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 11-30-2006
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Full tank of gas, yet guage and light says empty?!

so i went to the rez last night to get gas and smokes, and on the way home, my gas light came on, and the gauge said i had like, 3 needle widths PAST empty. i pulled over, didnt smell nothing, and it was running fine, and then about 10 min later it went away. the thing is, the time between i filled up, and the gas light came on was about 30 minutes, so any clues? ima call the dealer later today.
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Old 11-30-2006
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sounds like you may have a bad fuel sending unit...just a guess
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Old 11-30-2006
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Did you turn the engine off when refilling?? I noticed that it often takes a considerable amount of time for the gauge to read correctly if the engine isn't turned off while refueling.
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Old 11-30-2006
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gas cap wasn't properly tightened?
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Old 11-30-2006
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Quote:
Originally Posted by TBarCYa
Did you turn the engine off when refilling?? I noticed that it often takes a considerable amount of time for the gauge to read correctly if the engine isn't turned off while refueling.

isn't it recommended to shut the truck off before fueling?
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Old 11-30-2006
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man you stay away from the rez....

to close for comfort...
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Old 11-30-2006
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LOL!

I always turn off my truck when refilling, and the gas cap would show right away, right? tho i have never changed my fuel sendinding unit, my buddy wanted to a year ago, i told him it works, why mess with it
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Old 11-30-2006
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Quote:
Originally Posted by zabeard
isn't it recommended to shut the truck off before fueling?

for fire codes more than damage to the truck.


I have had a wirng issue that led to the fuel pump harness shoring ou under the turck. Take it in.
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Old 11-30-2006
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Neither of the sending units in mine work. Well the one for the rear tank kinda works, but it only reads a half tank when its full, and if I go over any big bumps or smack the top of the dash the needle shakes around and falls right back to empty. :p
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Old 11-30-2006
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so what tells the guage that the tank is full? something that is starting to not work, any clues on what it is?
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Old 12-01-2006
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i'm stickin with the sending unit....unless it's getting a bad signal from the float...but if the float were bad or stuck you'd more than likely get a constant bad reading and not a fluctuation on it
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Old 12-01-2006
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mine did the same thing sorta. i filled my tank till the pump stoped, and then i got in and drove off (after paying). looked at the gauge and it said only 3/4 tank. I stopped again and the started the truck and it said full this time.
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Old 12-02-2006
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The float is probably bad on the sending unit in the tank. I just changed mine, the float was full of gas, it developed a small crack in it after 112K. Ford only sells the whole sending unit, but I had one from another truck laying here, so I just swapped the float.
Mine was working fine one day and just quit the next, I had filled it up thinking it was empty and it only took a few dollars. I could here the fuel sloshing in the tank and knew it wasn't empty, so I went right to the sender to see what happened.
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Old 12-02-2006
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To test hte wiring, use a 15 ohm and 150 ohm resistor. Place the resistor in the harness between the yellow/white and ground(black). You can find the harness plug under the driver seat area. Or pull the bed and unplug it at the tank.
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Old 12-03-2006
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did you check any fuses?
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Old 12-04-2006
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Mine did that once. It took 1 hour for it to read correct on the guage. It has never donw it since. It was during the first real cold day too.
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