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Hi all, been having an issue with a slow start of the engine. It does start after cranking for a few seconds. Also when accelerating the car seems to struggle or lose power. 


I know the fuel pressure is dropping when the engine is off. As I have put a gauge on the fuel rail and the pressure drops. 


Now for the bit that’s confusing me. If I clamp the return pipe the pressure still drops. But when I clamp the supply line the pressure doesn’t drop. There doesn’t seem to be any fuel leaks in the system. And I have fitted an extra inline check valve in the supply line.  


Many advise would be great 

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