I checked the fuel pressure on the fuel rail and I am getting about 35psi with it running.

I got 48 lbs on both of the engines after I replaced the regulator on port side. The port wngine would not hold pressure when it was turned off. When I pulled the return line off the fuel regulator I saw a lot of fuel getting past the regulator when the key was turned on. That fuel pressure should hold when key is off. Turn key on for a few second then off pressure should not drop. If you wait a minute then check pressure it should still be there

I know your fuel rail is different but same regulator. Its actually just a pressure relief valve. There is a brass tube in the end with O rings on it, don't loose it. The new one does not come with it and use grease on all o rings when you reassemble. You can see the cap for the shrader valve and the fuel rail. My pressure regulator is underneath the fuel rail.

I will check fuel pressure like you say and go from there, thank you for your help I really appreciate it.

No problem. That was on my last boat that someone I know bought from me. He had this issue in August and I helped him trouble shoot it

I just hooked up a fuel pressure guage and when the key is on the pressure goes up and when you turn the key off the pressure drops to 0.

Pull the return line off the pressure regulator , have someone turn key on again and see if fuel squirts out of regulator. Start looking for a new one. They are hard to find. You will most likely find it on line. I found the one I needed on ebay but like i said if you can' find it, look up the regulator by the raised letters on the casting. You might find it at an auto store. When I looked it up Honda civic came up. It's a Japanese part.

http://www.michiganmotorz.com/mercruiser-fuel-pressure-regulator-p-4612.html?gclid=CjwKCAiA0IXQBRA2EiwAMODilzqMJ3xmpK 4y-dKP-XaFf7gzAQ1ZTqgnvv4cmRFDALOuIwsMKNNlMxoCJkcQAvD_BwE

Any way I just punched in NR1 fuel pressure for mercruiser. Michigan motors came up .118 bucks. I think we found ours for 100

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