Hey guys I was hoping you could help me out. I replaced my NA fuel pump with a TT pump awhile back(future plans). Well the other day I was at the library and picked up a Chiltons car book, looking for my car and found that the fuel pressure for the TT should be 34psi, and the fuel pressure for the NA should be 38psi. I found it under the tune up section. So my question is, could that be a problem? Could I possibly be running lean? I asked this question the other day in the upgrade bible thread but I havent had a response yet.
Yea chiltons is obviously mistaken, but there is still a difference of 4.1psi between the two pumps. 43.5psi for the Twin Turbo and 47.6psi for the NA. Is this the pressure the pump produces or whats regulated into the engine. I just want to be sure that its ok to use this pump in my car. Thanks for the manual.
The fuel pressure regulator at the end of the rear fuel rail is what sets the base fuel pressure. NA is slightly higher than than the TT models. Note that these are taken with the vac hose disconnected.
Standard value:
<Non Turbo>330-350 kPa (47-50 psi) at-curb idle
<Turbo> 295-315 kPa (43-45 psi) at curb idle
Ok so I shouldnt have any problems. I was just stumped, I know the turbo model has bigger injectors, physicaly larger pump and of course it needs more fuel than the NA, I just couldnt figure out why there was a difference. Well thanks for the info
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