evilpumkin

Well I mean as far a pushing threw it

nonnieselman

iTrader: (10)

Im running two Walbro 255's that are both on all the time.
its only 2-3psi higher than at idle than just one pump on.

evilpumkin

On the factory return system?

nonnieselman

iTrader: (10)

Yea mine is all factory except two pumps and injectors.

MikeGyver

iTrader: (5)

It sounds like you think that the fuel goes through the regulator before it goes to the injectors.
The fuel goes through the regulator on its way back to the tank. The more fuel that the engine uses, the less that goes back to the tank. Let me give an example. If you made enough power to overwhelm the stock regulator, and had a big enough pump and injectors to support the power, but both are almost max'ed out, this is what would happen: At high loads and full throttle, the fuel pressure regulator would have no problem controlling the pressure, because most of the fuel is going into the engine, not being bypassed back to the tank. When you let out of the throttle, the engine uses less fuel, the pump still puts out the same volume, but the fpr is too small and can't bypass enough fuel. Therefore pressure would go up during part throttle, not down like it is supposed to, and be too high .

thunder550

iTrader: (70)

Might be a dumb question, but do you have a good vacuum/boost line hooked up to the regulator?