Ok so i have a few questions regarding the bosch 040 fuel pump in my r32 gts-t...
Firstly i have a hard to start problem, the car will start fine of a morning after its been left over night but if i leave it for half an hour or so after driving it will crank for about 5 seconds before it fires( regardless of how many time i turn the key to ignition and prime the pump, and also regardless of whether i give it any throttle) so i dont know whether this could be linked to the fuel pump or not, but since i have tested for injector pulse, put new plugs in it, injectors overhauled and cleaned, new fuel filter and coolant temp sensor... i figure its my next place to look.
Also after starting the car i get a funny sound from the fuel pump like a grindy sort of sound, fairly loud (noticeable over the rather loud operating noise of the pump) and if i rev the car and hold revs on it, the noise dissappears. But as soon as i let it just idle again the noise will come back.
I remember reading that their is an electrical trick to do when installing the 040 to do with the voltage the pump receives? could any1 shed some light on this?
I also did a fault code check on the ecu and got code 55(all ok)
Any ideas?