pbmr2 wrote:from your description, the needle is reaching it's upper limit of movement at full tank.
my 2 cars have both got stock fuel gauges, one of them goes just past the top mark when full, the other only reaches the top of the top mark. the one with the higher reach, runs out of fuel just after the bottom mark.
the other car goes about another 30 miles before running out and sit even lower on the gauge.
I think you needle has been taken off and put back on facing too high. so fill the car to the brim.. like fill it, wait 20 second and then slowly fill some more. really make sure you can get no more fuel in.
then take the needle off and replace it with it pointing to the top of the top mark and no higher.
stick a small petrol can in the boot and drive till you run out of fuel. see where it got to.
if it's anything like the 3 or 4 gauges I've messed with then it should be just under the minimum mark it runs out.
the warning light is not very good, sometimes it works, sometimes it doesn't. ignore the light.
have you checked the plugs under the ashtray? there are 2. one if for the pump, the other is for the sender. just make sure they are not damaged etc and plugged in well.
I've known a few senders to fail but only after being parked up for a long time
That's what I'm thinking mate, before the dials were changed the fuel needle would go right down and when the red light came on I always had another 10-15 miles left.
I'll fill it up like you said and then remove the needle and put it on at the top.