td5 fuel guage showing full all the time

Whilst green laning last night we had to stop nose 1st on a 35% incline to safely get a disco 2 down a step. When we got to the bottom both myself and the td5 disco reported our tanks had gone from 3/4 to full.
Nowt strange their from being pointed downhill except mine never reads off the top full even when filled to the brim.
Long story short the disco 2 got wet and the xyz switch started playing up so we parked it and came back for it.
After 200 miles (about another 100 green laning/bumping banging, even dropping on to the tow bar) and a nearly empty tank I'm still showing off the top full. I've stuck a tenner in this morning in the hope it might do something and as I must be on fumes. But no joy
Anyone have any ideas how to sort this?

When you switch-off the ignition/circuit, I'm assuming that the gauge drops to E, or is it permanently at the F end of the dial?

If the needle does drop away once the ignition is turned-off, it'll likely be an issue with the tank-end of the circuit. Could be something as simple as a gummed-up sensor, incorrectly sited or loose sensor, else it'll probably need replacing.

Float could be stuck up at the top of the tank showing full.

RiffRaffRevival said:

When you switch-off the ignition/circuit, I'm assuming that the gauge drops to E, or is it permanently at the F end of the dial?

If the needle does drop away once the ignition is turned-off, it'll likely be an issue with the tank-end of the circuit. Could be something as simple as a gummed-up sensor, incorrectly sited or loose sensor, else it'll probably need replacing.

Click to expand...

it's a 3 month old pump and it does drop off when turned off.

bankz5152 said:

Float could be stuck up at the top of the tank showing full.

Click to expand...

I hope so. no amount of banging is making it return. Maybe it's worth opening the floor up and pulling the pump