Originally Posted by
mitchymitch
When i take a reading at the battery it shows 12.5v. i managed to get the pump to prime and this showed pressure at the regulator for the few seconds the pump primed and then dropped to zero, my knowledge isnt the best and i dont know if the gauge should be reading the 3.5 bar all the time after priming.
thanks for the replies
Firstly, your alternator should be outputting 13.8v, so you have a problem there to investigate.
The pump should prime for anything between 0.5 and 3 seconds then switch off, the fuel pressure will slowly drop from the point it switches off to the point you crank.
The valve responsible for holding this pressure is screwed into the output end of your fuel pump.
Was the engine working fine until you swopped the FPR? Some of the ones I see through my doors are miles out!
Secondly, was the old FPR running at a different pressure?
If so, your co screw setup will now be totally wrong too, which will only hinder your progress, but that said, it should still start and run.