Fuel Pump Question

[JWehrheim]

I only have 5psi right before the carb, which virtually no fuel comes out of the release value on the pressure gauge, just some a tiny bit of air. Would I need to replace the Hi Pressure or Low? Based on the lines, it appears to be the Hi.

[h2o-ski]

What engine do you have and in what boat? 5psi is about right for a carb but your boat in the profile was not offered with a carb. Not sure how to answer.

[JWehrheim]

It’s a 2008 RZ2 with a Marine Power 5.7 340hp.

I’ve heard it should have around 40-50psi

[Vettedrmr]

You mention a carburetor; has the engine been modified to remove the fuel injection system or were you referring to the throttle body (which has no relationship with the fuel system)?

[boatwakes]

Is the engine running or not?

There's no carb on your engine but the throttle body looks like one. You need to replace the high pressure pump because the fuel pressure you're reading indicates it is non-functional. The low pressure pump provides between 5-7psi and the high brings it up to 40+ for the fuel rail and injectors.