2006 F150 Fuel Gauge

[highlife4me]

So, long story short. I have had a fuel gauge issue with my truck the last few years. It has been to the dealer at least six times but is still not fixed because they are unable to solve the problem. Fuel gauge only works when it wants to. Fill the tank it will read full then drop to empty and low fuel warning comes on. While driving it will go back and forth from empty to what ever the gauge should read. So far the fuel pump has been changed, sending unit has been changed twice, part of the wiring harness has been changed and the connections in the harness have been cleaned several times. If anything the problem is getting worse instead of better. Dealer is to the point that they do not know what to do anymore. Truck only has 35,000 miles on it and is still under warranty so I would really like to get this taken care before warranty runs out. Any ideas?

[Capt. H (Ret.)]

Geez!! I don't know where to start with a Ford. I had two Chevy's that had bad instrument clusters that started with the fuel gague and affected the speedometer. Took me a while but Chevy changed the cluster at their expense and then I hit a deer with the second truck. Good by truck!!

Mike

[Hafnutz]

I know how to fix that! I have a 2006 Mercury and had 2006 F-150. Both of them did it. As it was explained to me by a Ford dealer. There is now a lot more sulphur in our gas?? anyway it builds up on the sending unit in the tank and prevents a true reading. Usually reads low or empty when you first fill then slowly goes up when it wants to. The cure?? A product called TECHRON fuel injector cleaner. Supposedly it's the only one that works. It does work. I add it about once every couple months or when the gauge starts to act up. Most of the major auto parts stores plus sometimes I find it at Wally World and Fleet Farm. Works for me. Also saw an article that GMs were having the same problem. They claim it's from etyhanol. Wouldn't surprise me..Let me know if it works for you.

[highlife4me]

I would think if that was it the problem would have gone away after changing out the sending unit twice. I will definately try this stuff though. If it works I will be having a few words with the service manager at my dealer.