VST fuel pump limits?

[LakeFever]

Got to wondering about fuel delivery and what the max hp the stock laser pump can support?

[OnPad]

Do you know what pump merc used? I haven't looked to see if they have any identifiable markings. I have heard stories of cheap replacement pumps on smaller engines, that burn up the ecu drivers because they draw too much.

[skialot2]

From my 2000 2.5 manual, the electric fuel pump is capable of 90psi and runs continuously while providing fuel in excess of engine demands. Operating pressure is 34-36psi. and is controlled by the pressure regulator. If the pump can pump almost 3 times the pressure needed for stock power. It can probably supply enough fuel for almost any hop-in-up you want to do. Except maybe N2O

Electric Fuel Pump (Inside Vapor Separator) The electric fuel pump runs continuously while providing fuel in excess of engine demands. The excess fuel is circulated through the fuel rail to the fuel pressure regulator and back to the vapor separator. Normal fuel pressure is 34 ± 36 psi (234 to 248 kPa).

Fuel Pressure Regulator The fuel pressure regulator is located on top of the vapor separator and is continuously regulating fuel pressure produced by the electric fuel pump. The electric pump is capable of producing 90 psi (621 kPa) of fuel pressure. The pressure regulator limits fuel pressure at the injectors to 34 to 36 psi (234 to 248 kPa).

[LakeFever]

No clue what pump is in there. I have one opened up I don’t recall any identifying markings but I’ll take another look. Pressure and volume are quite different animals. To support a lot of hp you need both

[OnPad]

Maybe a stand alone wiring upgrade would help? Probably mandatory when passing the limits of the 225 ecu.
A fuel pressure gauge wouldn't hurt either. I think the pressure would drop when running out of volume.