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.

 

sounds like you may have a bad fuel sending unit...just a guess

 

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.

 

gas cap wasn't properly tightened?

 

isn't it recommended to shut the truck off before fueling?

 

man you stay away from the rez....

to close for comfort...

 

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

 

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.

 

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

 

so what tells the guage that the tank is full? something that is starting to not work, any clues on what it is?

 

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

 

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.

 

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.

 

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.

 

did you check any fuses?

 

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.