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High fuel pressure?

Old 09-05-2021, 11:17 PM
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Default High fuel pressure?

I'm running the KE blue mech fuel pump on a warmed up 525sc. Boats inning really crappy today. Loading up.. stalling..

I have an electrical fuel pump gage on the dash and it was pegged over 10 psi. Anybody ever have an issue with these making too much pressure?
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Old 09-06-2021, 06:11 AM
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Yes, I have. Check the vent tube. Iíve seen guys boost reference the top of the diaphragm in blow through setups, maybe itís clogged and built some pressure above the diaphragm? Slim chance but worth looking at
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Old 09-06-2021, 09:00 AM
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Havenít run into any mech pump increasing psi, but others have. Iíd do what was suggested above. If that doesnít work, it is more likely the top section that has issue. The big spring on top of ghe diaphragm is what setís fuel psi.

The bottom section of the pump has the one way valves the Ďiní has and the Ďout.í If these vslves have an issue, little or no fuel psi would be the outcome as fuel can reverse direction thru part of the stroke.

Last edited by SB; 09-06-2021 at 09:02 AM.
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Old 09-06-2021, 09:05 AM
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Old 09-07-2021, 07:22 AM
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Mine was at 9psi on my new engines. I added a fuel pressure regulator and dropped it to 7psi and all was good.
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Old 09-07-2021, 07:53 AM
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Originally Posted by cig28 View Post
Mine was at 9psi on my new engines. I added a fuel pressure regulator and dropped it to 7psi and all was good.
was the top half new too ? Been a bunch of oe and aftmkt mechanical pumps with too high psi issues.
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Old 09-13-2021, 04:34 PM
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Water in the fuel will give you all of those symptoms and make your gauge read high. I Just went through everything you have described on new to me boat and it was a tank full of water to blame.
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