: Fuel Level Gauge question

09-04-04, 11:58 PM
in my 77 Caddy hearse the fuel gauge doesnt tell the correct level. im not sure if it is the fuel gauge or the fuel sending unit that isnt working but sometimes the fuel gauge will go directly from empty to full and go back to empty. sometimes it acts like its going to full and then about in the middle itll go back to empty, can anyone tell me what is going on? also, the gas tank had alot of rust in it. we bought an Eastwood sealant/rust remover kit and dropped the tank then used it but it is still getting alot of rust inside the inline filter, im running out of ideas on what i need to do to get this thing running perfect

barge master
09-05-04, 10:39 AM
I'd suspect the sending unit esp. if the tank is full of rust. Confirm if you have a good ground and remove the sender and see if the resistance varies across it with an ohmmeter as you move the float up and down.