350 mag mpi mercuruser

Discussion in 'Mechanic Recommendation Forum' started by jerry5457, Aug 10, 2018.

  1. jerry5457

    jerry5457 New Member

    1
    Aug 10, 2018
    1999 310 sundancer twin inboard 350 mag mpi mercurse ray marine radar
    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.
     
  2. scooper321

    scooper321 Active Member SILVER Sponsor

    464
    Jul 4, 2015
    Baltimore, MD
    "Lollygagger" 2003 Sundancer 320, Simrad NSS2 Evo9
    Twin 5.7L Horizon Mercruiser (350 MAG MPI) V-drives
    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.
     
  3. scoflaw

    scoflaw Well-Known Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    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.
     
  4. rmatt0909

    rmatt0909 New Member

    5
    Apr 21, 2013
    Piermont
    2007 38' Sundancer
    merc 8.1
    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.
     
  5. scoflaw

    scoflaw Well-Known Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    PO has CF2's not 3's
     

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