Cool Fuel Gen III delamination 2006 8.1s

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Zorba, Jan 19, 2018.

  1. Zorba

    Zorba Active Member

    May 21, 2008
    East Harbor, Lake Erie
    2006 340 Sundancer
    Twin 8.1 Mercruiser
    I think i know my fuel issue but want some confirmation. I dealt with it last year in the hopes i could change my plugs and get peak performance again as usual, but alas at the plug change still could not make WOT RPM (4100 is best i could do) and still had some significant trans rattle indicative of a miss. Soooo, what is everyone's experience getting MerCruiser to fess up to the issue and at a minimum discount the replacement unit. I know of all the service bulletin and have heard stories of getting them to replace, but want see if anyone had some practical advice. I'm a realistic person and know we are talking about a 12 year old boat but it cant hurt to ask...

    Also what is everyone's source for injectors... part numbers?
     
  2. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    This won't help you Zorba, but...My 340 had 8.1s with trouble free Gen II Cool Fuel - I'd so love to pick the brain of the engineer that signed off on the CF 3 design. I never had vapor lock troubles with CF2, but I assume other folks must have...Has anyone priced a conversion from CFIII back to CFII?
     
  3. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    My 2008 failed in 2014. After inspection, it was not delaminated paint but still the same failure and symptoms that the paint causes.

    Merc did redesign it and the cf is no longer anything close in design now.
     
  4. scoflaw

    scoflaw Well-Known Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Would like a better explanation of both of these statements
    So if it wasn't paint that clogged your injectors, what was it ?
    Tell us about the design that is so different.
     
  5. juggernaut1

    juggernaut1 Active Member PLATINUM Sponsor

    689
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Have you changed your plug wires - this was the source of the problem for one of my motors not reaching full rpm.
     
  6. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Boat started acting up out of the blue. Would randomly shut off sounding like fuel starvation. Slowly started losing performance. Eventually died and wouldn't restart and didn't have sufficient fuel pressure at the rail. All the symptoms of paint issues that kill the pump and clog the injectors. Replaced CF module and disassembled. All paint intact inside (but it was sprayed in there). Replaced all injectors and had them cleaned- no paint. So I had all the symptoms of the death by paint, but just ended up it was the fuel modules inside the CF dying, but not from paint.
     
  7. Zorba

    Zorba Active Member

    May 21, 2008
    East Harbor, Lake Erie
    2006 340 Sundancer
    Twin 8.1 Mercruiser
    I may/should try this first. Care to share which wires you went with if not the $400 OEM?
     
  8. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Volvo penta plug wires 3861295
    $105. Perfect fit.
     
  9. juggernaut1

    juggernaut1 Active Member PLATINUM Sponsor

    689
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    I went volvo penta wires for their version of the 8.1 and they fitted perfectly......I then later picked up spare sets of AC Delco's (exactly what was originally on the motors) from Michegan Motors for about US$50 a set at the time.....so I grabbed 4 sets. Far cheaper than AUD $1,000+ a set the Mercruiser dealers were quoting here in Oz.
     
    Last edited: Jan 19, 2018

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