05 24v 6.0 MP fuel pressure

[kellyrmartin]

I’ve had intermittent issues with my boat since I got it 3 years ago that seemed like they could be fuel related.

I just noticed that when I click the key on but don’t start the motor , the fuel pressure comes up to 65 lbs, the pump stops whirring and then the pressure leaks down to 0 lbs over about 10 seconds.

I’m thinking this is an issue so I am trying to figure out what is causing the leak down.

Can anyone confirm this is the fuel pressure regulator?



I replaced it with the same part that was already there but it came up as a fuel filter from NAPA however I see a part from GM. That looks almost identical that is called out as a fuel pressure regulator.

Any insight out there would be greatly appreciated

Thanks


Sent from my iPhone using Tapatalk

[kellyrmartin]

Does anyone out there know if the fuel pressure should be dropping off like this when the motor is not running?

[boatwakes]

The fuel pressure SHOULD NOT be dropping off and usually indicates a stuck injector.

[kellyrmartin]

My thought is that a stuck injector would basically make its respective cylinder run super rich and exhaust black smoke no? The motor runs great until it heats up and then it wont idle intermittently.

[kellyrmartin]

So it looks like my intermittent issue is fuel pressure related.

Boat died at the lake today and I had the fuel pressure gauge on.

When it died and wouldn't restart the fuel pressure wasn't coming up over 10 psi.

According to the other threads I have read this can range from a known issue in 6.0L MP engines to vapour lock to a bad fuel pump.

Im wondering if there are any ideas out there on how to begin narrowing down which one it is.

Thanks