87 F250 DIESEL FUEL GAUGE READING WRONG
 

1987 F250 6.9 4SP MANUAL 4X4 DUAL FUEL TANKS BOTH FUEL TANKS READ ON THE GAUGE OVER FULL FRONT TANK IS WAY OVER FULL AND THE REAR TANK IS JUST SLIGHTLY OVER FULL I CHECKED FOR POWER TO FRONT TANK AND IT IS GETTING POWER WHEN I UNPLUGGED IT THE GAUGE STILL SHOWS WAY OVER FULL I KNOW THAT BOTH TANKS ARE NOT FULL I HAVE OVER 220 MILES OUT OF EACH TANK AND NEED TO GET THIS FIXED THANKS FOR YOUR HELP.

Ok it appears the sending unit is what is wrong but now i can't find one No parts stores or dealers have them available Please HELP!!!! does anyone know where i can purchase fuel level sender for 187 f250 6.9 diesel engine thank you very much.

try rockauto.com

LMC truck?

I Will give ROCKAUTO a call LMC is a no go they do not have them for 87 6.9 diesel but thank you for you response.

Not nessisarily the sending units I would check the wires at the selector switch my 87 which is gas(shouldn't matter) defaults to full reading on gauge when circut is open (broken wire corroded unhooked etc.)
The fact that both tanks are reading full lead me to believe your problem is at selector switch. Chances are that both sending units did not fail at same time. I had to replace the selector switch due to the fact it was heavily rusted i bought a generic selector switch from jc whitney. I would hate to see you drop both tanks only to find it is not the problem.

Oh the switch is located on drivers side frame rail about where the cab and bed meet follow the fuel lines you will find it

Thanks Krazywolf8169 I will check that for sure i did drop midship tank removed sender and with the sender out i can move the float almost all the way to empty than it starts to read so there is only about 1/4 inch of float movement i can make gauge read full to empty if i move it slow enough with in that 1/4 i can make gauge read any where i want full,3/4,1/2,1/4 empty thanks for help i will check the switch :D

If theres only a 1/4 inch float movement, its bad. Float should move from bottom of tank, up to the top of the tank.

The float will move several inches but only 1/4 inch of that movement reads on gauge after 1/4inch from bottom the tank reads way way over full.

The float moves 10, 12 inches, if only a 1/4 of that, movement reads on gauge. Sounds like sender is bad.

Thanks that was my thought also but wanted another opinion :D

Removed both sender sent them to Tri Starr LLC in NY to be rebuilt since you cant buy new ones will update you when i get them installed
hope to have them back in 2 weeks

Got them back and installed they work great This job is done :D

What else does Tri Starr do ? Can you give us contact info ? Thx