I had the same problem with my truck. My B2200 is fuel injected, so it my be different as I have an electric fuel pump, but what had happened was the ground wire that attaches to the actual float of the gauge had fallen off due to all the movement it's gone through in its life. As far as fixing it yourself, it is possible, but no fun. You'll have to:
-disconnect the filler tube from the body
-release the tank from the truck and set it on the floor (do this when the tank is near empty)
-pull out the fuel sending unit/fuel level reader from the top of the tank (be careful of sparks that will ignite the gas)
-you will probably find a loose wire hanging from the assembly, this need to be soldered back onto it's terminal (near the float)
-reassemble the tank and reinstall
Do this as soon as possible, because before I fixed mine, my trucked died on the road twice as a reult of this problem (it kept blowing fuses)
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Monday, December 15th, 2008 AT 12:33 PM