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90MirageTrovare

08-03-2021 09:25 PM

Need advice...Again. 1990 Merc 454

Boat ran great all day, no issues. On the way back in she surged a few times and then lost power and shutdown. Fuel gauge is not working well(when do they ever) so I thought we ran out of fuel. Got towed in fueled up put it back in the water yesterday, she was vapor locked got it going with a little starting fluid, ran great all day then on the way back in she died the same way. I’m thinking coil??? Or water in the fuel filter??? Help please.

Smitty275

08-03-2021 10:13 PM

Have you put a new fuel pump in it?

90MirageTrovare

08-03-2021 10:17 PM

Quote:

Originally Posted by Smitty275 (Post 4800190)

Have you put a new fuel pump in it?

no I have not

SB	08-03-2021 10:17 PM

Which 454 ?

Please don’t answer Chevy

Smitty275

08-03-2021 10:24 PM

It wouldn't have been vapor locked if it was a cold motor. A bad coil wouldn't have been affected by using starting fluid. No spark is no spark. I think your fuel pump is toast.

90MirageTrovare

08-03-2021 10:46 PM

Quote:

Originally Posted by SB (Post 4800192)

Which 454 ?

Please don’t answer Chevy

Haha! Mercruiser Gen 4 Magnum H.O.

Griff

08-04-2021 01:41 AM

Pull the fuel filter and dump it in a clear glass. Wait a few minutes and see if if there is separation.

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