Morris Minor Owners Club

Continuing with my restoration I have recently fitted new petrol tank, and a NOS sender unit. Checking the electrics when I turn ignition on the fuel gauge reads full, yet there is no fuel in tank.
One thought the tank is bedded in a mastic to seal it to the bodywork. Could I not be getting a good earth connection.? The leac from the gauge to the sender is all ok. New wiring harness. Any thoughts please. Ty

Test it with a test wire from the sensor unit to earth. If that solves your problem connect it permanently.
Regards
Declan

Thanks Declan.
Another thing that has come to mind is the type of sender unit. I understand that there are two types of sender. I have a gold face speedo and fuel gauge. I read somewhere that the sender unit changed when black faced speedo and gauge were introduced. Is that correct.
I think my sender unit is a later one. Fairly flat top with lucar connector. Could I have the wrong sender for the gauge?
Any help appreciated
Ty

Yup two types of sender (three if , as I believe to be the case the MM had a very early one) roughly divided into Gold faced speedo / fuel gauge and black faced ones. Inevitably the former are more expensive.

https://www.morrisminor.org.uk/parts/26-fuel-system

Yes, if your sender has a Lucar connector it IS for the later (black face) gauge. You'll have to obtain the correct sender (or use the black gauge along with a voltage stabiliser I suppose).