350 mag mpi mercuruser

jerry5457

New Member
Aug 10, 2018
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1999 310 sundancer twin inboard 350 mag mpi mercurse ray marine radar
Engines
350 mag mpi 1999 mercurser
have twin 350 mpi engines, both engi nes will not go above 2000 rpm under load mechanic says its fuel pumps on both engines exactly the same time ? says pressure on both engines are 19 and 23 psi. anyone have idea if correct and how much it will cost to replace both fuel pumps. he did not check the gas which is almost 2 years old.
 
What year engines? Do they have the cool fuel modules with the painted insides? That stuff flakes and clogs things up. Google "painted cool fuel" and read about it. Happens in mid 2000s engines. Weird that they happened at the same time though.
 
Doing a pump on my 502 now, same year, same issue. CF2 At 20 years old it's due. Took quite a while to get it out. If I were to do it again, I would attempt it without removing the plenum. Expect to pay plenty, Merc pump alone is over 400. I cheaped out and will use the Airtex E11004 for 80 bucks.
 
have twin 350 mpi engines, both engi nes will not go above 2000 rpm under load mechanic says its fuel pumps on both engines exactly the same time ? says pressure on both engines are 19 and 23 psi. anyone have idea if correct and how much it will cost to replace both fuel pumps. he did not check the gas which is almost 2 years old.
The water cooled pump's that are painted had been recalled mid 2000, I replaced them and my repair shop got merccrusier to pay for them 4 years ago, it was a marine max and probably do a lot of business with merc. Might be worth the fight with them.
 

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