1st Problem w/New Truck. Fuel Gauge Going Crazy

[06carolinadiesel]

When I bought the truck the owner said the fuel gauge wasnt very accurate, I didnt think much about it at the time. I filled the tank up and have driven 260 miles and still reading just under 3/4 of a tank, and as I drive the truck the gauge continues to rise til it reads full.

I'm guessing the fuel sending unit is shot, but would like to get some more info just to make sure before i drop the the 400 on a new one

[06carolinadiesel]

bump on some help

[theplumbingmedic]

Wish i knew but heres a bump to the top i`m sure someone will chime in

[06carolinadiesel]

try a bump again...

[david1991]

Not a lot of help but mine always reads full never moves at all and it is for sure the sending unit. I just use the trip counter and fill up at 350.

[coot1]

Mine used to read whackey. Turned out to be a loose connector on the dash module.

[06carolinadiesel]

is there any way to check for sure if its the fuel sending unit

[Lilfarmrboy]

I'd have money on the sending unit. I have had two other vehicles that have done the same thing and it was that both times. It could be a lose conection but I doubt it.

[jesilvas]

Now, these units are electronic, not mechanical. Therefore, if you fill it up with the motor still running, the float in the tank rises, and the PCM sees it, but the motor on the gauge is very slow. However, it's not THAT slow.