Thanks for all the ideas guys it is very much appreciated

Mark- every one down here said you want to what?? and have never heard of HP gauges so it looks like that's a dead end for the moment.

Martin- Thats a interesting one im wondering if a vibration in the engine could be setting this off??

James- I will scope all 3 wires in the morning see what happens. Good tip on using the emissions tester to pick up on HC from the petrol.Im going to try that in the morning.

In answer to your questions it takes less than a second to start the engine. The 0.5 KOEO signal is present and hits 2V as the engine starts then drops back to 1.3V at idle.

As for low pressure feed I don't think this car has a in low pressure pump, parts dept don't know. im going to access the top of the tank and check for myself.

Again thanks for all you help. I will let you know i get on.
James