CF3 fuel regulator leak?

Discussion in 'General Discussion' started by stephenm27, May 17, 2019 at 10:12 PM.

  1. stephenm27

    stephenm27 Member

    253
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    So, in preparing for a first outing of the season this evening, I found this disturbing fuel leak from the regulator on the CF3 fuel module (2009 350 MAG). My question is, has anyone experienced this before? Is this a common leak point? Is there more wrong than what I'm seeing?

    Any insight/experience/wisdom greatly appreciated...thanks in advance!

    Notes:
    • It's a very faint leak, but is definitely a leak.
    • Engines have not been run since last fall.
    • Ignitions were briefly on to raise the drives last night so I assume the fuel pump ran to pressurize the system.
    • I verified regulator retaining bolts are tight.
    • Boat is on trailer, stored indoors.
    • This CF3 module appears to have been updated by the PO as it does not have the problematic raw water hoses on the rear.



    [​IMG]
     
  2. stephenm27

    stephenm27 Member

    253
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    In order to help those that may search this topic later...I'll post a reply to my own thread now that I've done some further investigation.

    1. Removed CF3 paper filter cartridge, inspected cavity. Noted nothing abnormal, no flaking paint.
    2. Removed CF3 fuel regulator (pictured above) and found large paint flake covering roughly 30% of the surface (see picture below).

    Unsure of next steps but I'll probably start with calling Mercruiser to see if there's any assistance for this design fail. Any words of advice in this regard are welcomed. I know a few on the forum have been through the CF3 replacement process.


    [​IMG]

    [​IMG]
     
  3. Espos4

    Espos4 Active Member

    833
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Looks like the classic “CF3 paint issue”

    Mercruiser has been supplying a free replacement CF3 module to your local authorized repair shop and you will most likely be responsible for the labor.
     
  4. stephenm27

    stephenm27 Member

    253
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    I've read Mercruiser has stepped up on occasion but not in many instances. Given that this module appears to have been replaced previously (as it doesn't have the original problematic raw water connections), I'm not sure they'd be inclined to replace it yet again--if in fact they actually covered the first replacement (previous owner).

    Worse yet, MMax is my local "authorized" shop so there's likely $800 labor based on their typical rates, saving only a few hundred as new complete module is $1200. Installation seems straightforward--2 low voltage plugs, 2 raw water hoses, 1 high pressure fuel line, 1 low pressure fuel line.

    As usual, it's really the inconvenience of the down time, especially at this time of year...
     
  5. dan313

    dan313 Member

    142
    Sep 27, 2009
    Long Island
    2005 270 Amberjack
    350 Mag Bravo3
    I just had mine done Sept 2018 on my 05 engine. Merc covered the cost of the replacement module and 8 fuel injectors. I had to pay the labor. Go to a certified merc mechanic and have them put in a claim. Merc knew about this since 2004. They will not do a recall, cost way too much money. But if you have an issue they will step up and cover the cost of the replacement parts.
    Good Luck
     
    stephenm27 likes this.
  6. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    I took the cover off mine and bead blasted the remaining paint off it. Worked fine after that. There is another fuel regulator on the fuel rail that has a screen in it that can trap paint. Monitor your pressure after you do this, if it's not correct, you will have to replace the regulator on the cf unit. The paint never made it to my injectors.

    Real DIY repair, you could have this done in a day
     
    Last edited: May 21, 2019 at 8:21 AM
  7. Irie308

    Irie308 Active Member SILVER Sponsor

    922
    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    Like Scoflaw said, If you have the newly designed lower housing all you have to do is have the cover blasted to remove the paint. If your pumps and regulators on the fuel rail is fine your back in biz. Cheap fix. I primed the exterior of my cover as its aluminum.
     
    stephenm27 likes this.
  8. stephenm27

    stephenm27 Member

    253
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    Your comments re blasting the cover have me thinking that might be a better answer than an entirely new module. This engine has not shown any symptoms of problems. The ONLY thing that caught this problem was the detection of the faint leak at the CF3 regulator, so it's likely (hopefully) that no paint has made it downstream to the rail. And, the CF3 housing is most definitely the updated one so replacing it strictly on that basis isn't necessary.

    I'm not intimately familiar with blasting but know what it is/what it's for/etc. I don't have a blaster, but Amazon does...anything so special about doing this that a $100 portable unit wouldn't suffice? Just pull the cover, clean, blast interior of paint, clean thoroughly, prime exterior of cover and replace?
     
  9. stephenm27

    stephenm27 Member

    253
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    Were you having engine issues that caused you to involve them? That's my problem (I think). I caught this due to a leak around the regulator. I can't report any performance or running issues. In removing the CF3 regulator to investigate/replace it, I found the paint de-lamination shown above.

    I could see how Mercruiser would side-step this one given they've not been proactive on addressing the issue--only reactive it seems when you experience resultant problems.
     

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