Steve, only two wires to the tank, so no in tank pump fitted. Hardly any leak of from injectors cold or warm, can’t find any rail pressure relief valve or leak off pipe from rail, only the pressure sensor.

Chris, I removed transfer pump from back of HP pump and shaft is intact. No bubbles at all in fuel lines or leak off pipes.

Antony, I agree with you, it sounds like I am doing the job of the transfer pump. When I removed the complete pump I can get over 0.5 bar of suction just by turning the pump by hand but obviously no way of checking the out put from the transfer pump. I did notice that with vac held on the inlet to the transfer pump as I turn the HP pump drive slowly there is one point every revolution when the vac is lost very quickly. I’ve ordered a new pump, which should be here tomorrow.

Thanks again for all your suggestions.

Graham