Long Range Petrol tank access issue

[Yendor]

The stock sender isn't that accurate. The dial doesn't start moving until half a tank or so.
It could be the dial itself is faulty.
I reckon I find out soon.

The RB30 being carby runs a different electric fuel pump to the TB42E. Both pressure and flow rate will be much lower. Hopefully the RB30 guru (no not you Dom lol) mudnut knows what the specs are.

If funds allow I would stick with the internal fuel pump.

You need to get the old unit out first and inspect. There should be a sock on the end of the pick up that may have started to break down and causing blockage or possibly you might have a connection problem inside the tank.

If you do decide to go the external pump root you will need to remove the internal pump and extent the pickup.

Fuel gauge accurately is never true when aftermarket tanks are used. They use the original fuel sender unit and just extended it. This normally causes the first half of the tank to be inaccurate.