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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    Tested the fuel pump and regulator today, plugged the return line, and pump is pumping 95psi. So ordering a regulator, that should fix me up. Thanks for your help.
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    10/4 thanks, I will check this weekend. Going to pull assembly out this weekend.
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    The mercury fuel pump is what’s so high, do you know of a trusted brand. I have had 2 say EMP, but can’t find any reviews online
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    Yea I’ve looked at the regulators, CCP has them for 166. Factory ones. What is a good fuel pump, I don’t think this quantum is a very good fuel pump. I’ve been told EMP is a good one. Part# 1399-39519. I only want to do this one time. Because to change the regulator the hole assembly has to come...
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    I have changed the PR on the fuel rail, but haven’t changed the one on mounted on the cooler. Which I’m guessing operates the fuel return part of it. When it first started doing it, I could pull the PR off the end of fuel rail, and it would fire right up, and run fine till you cut it off again...
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    OW061928
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    Murcruiser 5.0 mpi fuel pressure way down, and none after it sits

    I have a 2005 Murcruiser 5.0 mpi with the cool fuel 2 system. Had the boat and only put about 10 hours on it and fuel pump went out. I bought a Quantum replacement pump after reviewing them for a week or so. But now when I run the boat my fuel pressure is low, 30 at idle, but boat runs perfect...
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