1995 Merc V-150 Mag/EFI Model 1150413RD

by Dave
(Grand Lake, Colorado)

Engine starts fine and idles OK. Mounted on 1860 Fischer Sport walk thru windshield.
Hit throttle, boat would plane out fine, 40 mph plus, run for 2 or 3 minutes, then suddenly shut off with alarms.Telltale has good stream, new impeller last fall.Fresh fuel and water seperator.I do have a 9.9 kicker that is tied in to the fuel tank using a fuel switch.Appears to me that motor is starving for fuel at high RPM. Motor will idle fine for long period of time. I have ordered low pressure fuel pump rebuild kit but with good starting and idle I dont think that is problem. Could the high pressure pump be failing? I am looking on Youtube to see how big a job switching high pressure pump is.
Appreciate the help.

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Jul 17, 2025
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by: Terry

If it is clogged heads you maybe able to run at a lower speed maybe between 32-35 all day without shutting down. Your alarm going off is probably because of over heating if it is clogged heads.
Jul 17, 2025
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by: Terry

I have the same happening on my 90 hp Yamaha and its clogged heads but you will still see a good water discharge thru the pee hole.

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