Evening all and an update.
The VSS/ connector has clearly dried out and now the speedo is working again. With a working speedo I can confirm the Fuel Gauge works and remains steady. It does not move around as the petrol was sloshing about as I had before with no speedo.
Secondly the car has run into the petrol reserve with no problems which is good news.
I will keep an eye on it and make sure I always have LPG also just in case.
But to confirm this is what I think happened.
Regulator in the Alternator wore out and gave a red battery light, in turn this drained the battery and during this low voltage period it killed off or at least upset/damaged to some extent the old fuel pump. When starting the car again it drove for a short time then died on half a tank of fuel and would not start again. New fuel pump put in but still would not start though all connected, power was going to it and had half a tank of fuel. Refitted everything, checked it all and its seating etc to make sure and still no luck. I then topped the petrol tank up 100% and it started fine and has been driven and used a full tank of fuel with no problems at all.
So my thoughts are as suggested putting more fuel in allowed the pump to be primed/ filled the bowl/ pickup/ remove airlocks and at that point it worked fine.
So time to drive it more
