Cortina mk2 petrol tank sender

[imjustachef]

I've just finished putting my mk2 Cortina back together and can't get the petrol gauge to work

all clues point to the sender unit in the tank, I've fitted two which I happened to have, neither  

have worked ! is there a way of testing them to see if they are working ? and if both are broken

is there a way to fix them ?

[mk1del]

Tip to try to make sure it is sender not bad earth ,with ignition off ground the main  wire to body, then turn ignition on ,the gauge should then go up, if it doesn't, then a gauge or wire fault,, if they work ok connect main wire back to sender, then get apiece of wire to a good earth then touch it to body of sender then put ignition on again, if still no good then assume sender faulty, I have had it before where the tank didn't earth to body thus same problem no reading , hope this helps and makes sense

[imjustachef]

Thanks I'll try earthing the tank today, both the tank and the boot floor have a good covering of fresh paint

on them and I'm sure that one of the senders was working when I ripped the car apart.

[Vista]

Poor earthing of the tank to body/chassis is a definite source of problems