I recently had cause to remove the fuel tank due to a petrol smell. The fault was a tiny crack on the small right angle plastic bit on the return pipe. Fixed it and replaced the tank. All good. Except the fuel gauge now doesn't work. I have. 1) Removed the pump and put a multi meter on the sender unit contacts, and it reads perfectly when you move the float up and down. 2) cleaned the contacts on the plug and on top of the fuel pump. 3) My son has the proper Volvo OBD and computer programme. We have tested the gauge and it works perfectly, 4) I have looked carefully at the connecting plug for broken wires and can see nothing.
All I did was remove the tank and replace it.
Can anyone please offer any suggestion as to what I can do next. I'm stuck.
Thanks in advance
Phil