How much HP can a original seawaterpump mounted fuel pump take?

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02-26-2019 | 04:55 AM

McNick

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How much HP can a original seawaterpump mounted fuel pump take?

Anyone know how much HP/how many GPH a original mercruiser 454/502 seawaterpump mounted fuel pump can manage?

02-26-2019 | 12:15 PM

Griff

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From: Omaha/LOTO

The same Merc seawater mounted fuel pump is used on the 454Mag thru the 600SC so should be good to 600hp.
I'd probably be conservative and not use it for more than about 550hp.

02-27-2019 | 01:30 AM

Griff

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From: Omaha/LOTO

Quote:

Originally Posted by ALL_IN!

600sci and 700sci same part number, so up to 700+ HP? But it's basically a priming pump for the electric pump.

The 600sci and 700sci do not use the same seawater mounted fuel pump as the carbed engines.
The 454mag thru 600sc carbed engines use part #861677T

02-27-2019 | 04:45 AM

Full Force

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From: Olmsted Falls,Ohio Marblehead,Oh

I had them with 600 HP 565's no issues but I would not go anymore then that

02-27-2019 | 07:35 AM

ALL_IN!

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From: Henderson, KY

Quote:

Originally Posted by Griff

The 600sci and 700sci do not use the same seawater mounted fuel pump as the carbed engines.
The 454mag thru 600sc carbed engines use part #861677T

Doh! You are correct, sir. I misread sc, as sci. Deleting my post to prevent confusion.
Terry

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