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1998 350 Mariner 5.0 Merc 3000RPM WOT

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author United States of America
grizer
Scurvy Dog
Scurvy Dog
Posts: 29
Joined: August 7th, 2018, 2:48 pm
Vessel Info: 1998 Carver 350 Mariner
Location: Port Clinton, OH

Re: 1998 350 Mariner 5.0 Merc 3000RPM WOT

Postby grizer » September 5th, 2018, 8:23 pm

@bud37, we have had the boat 4 years and this issue is new (last month or so), the engines are mpi w merc coolfuel2 pump, batteries new last year and seem to be in great shape (no slow cranking or anything like that), ECM not throwing any codes.

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United States of America
CptBacardi
Scurvy Dog
Scurvy Dog
Posts: 48
Joined: June 11th, 2017, 5:02 pm
Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
Location: Texas
Has thanked: 3 times

Re: 1998 350 Mariner 5.0 Merc 3000RPM WOT

Postby CptBacardi » September 6th, 2018, 11:16 pm

My GUESS: low voltage from the batteries. Seen similar issues before. Free for you to diagnose yourself. Put a multimeter on it.
1989 Carver 38 Santego
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Topic author United States of America
grizer
Scurvy Dog
Scurvy Dog
Posts: 29
Joined: August 7th, 2018, 2:48 pm
Vessel Info: 1998 Carver 350 Mariner
Location: Port Clinton, OH

Re: 1998 350 Mariner 5.0 Merc 3000RPM WOT

Postby grizer » September 15th, 2018, 8:18 am

@tomschauer - I understand that but am trying to understand what else could be the issue, what conditions need to be satisfied for the fuel pump to work? Only voltage and fuel in? It would seem like there is something else and it is odd that both engines behave the same way. I guess I am trying to see if there is something else that is common to both engines that could be the culprit.
@bud37 - my original post covered all of your questions, we have had the boat 4 yrs, it just started doing this summer, these are MPI engines (Merc 350s w Cool Fuel 2 pumps), batteries are perfect.

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