Mercury,150Tower of Power Inline 6 1978

by Randy Smithee
(Payson, Utah)

It starts great idles great. It jumps out of the hole and cruises well. For about 15 - 20 min. Then falls of plane and wont rev over about 2000 RPM. I changed the fuel pump dia and valves. It ran great for 7 - 10 outings. Now its right back to the same behavior. Limping back in.

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May 18, 2022
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starstarstarstarstar 		Just a guess
by: Jamie Bradley

Hey Bud, two things come to mind when I read your description. Fuel tank vent stopped up or coil pack braking down due to heat from running. Only way Ive been able to diag the braking down coil pack is to.run engine normally with the exception of having the cowling on. Let cool air hit it and see if it runs significantly longer. I'm a mechanic but not a boat mechanic. This is guess a guess

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