Blower or no blower?

Discussion in 'General Discussion' started by Groucho, Nov 7, 2019.

  1. Groucho

    Groucho Well-Known Member

    Jun 11, 2008
    Albany/Lake George NY
    2004 320 DA
    6.2 V-Drives
    Well...The boat is out till Spring now, so I figured I would ask the question, I know it is recommended but in reality who uses the blower for 4 minutes...or at all....??when first starting or underway. With the fuel injected motors of today they do not expel the gas vapors of the past. Frankly the SR blowers are so noisy I will have to replace mine with something quieter for next year..
  2. Chris-380

    Chris-380 Active Member

    Jan 20, 2019
    Pontoon Beach IL
    380 Sundancer 2000
    454 Horizon w/V drives
    I turn in on a few minutes before I start it and let it run the whole time.
  3. superwa

    superwa Active Member GOLD Sponsor

    Jul 27, 2013
    Rhode Island
    2001 Sea Ray Sundancer 380
    Mercruiser horizon 8.1S
    Four minutes before start and during idle for me. Why risk it
    mmcguire2002 likes this.
  4. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    I turn mine on before I start the motors and leave them running the whole time the motors are running.
    Nauti-Kal and Chris-380 like this.
  5. Fly'n Family

    Fly'n Family Active Member

    Sep 19, 2013
    TX / CO
    2008 Meridian 341
    2004 Boston Whaler Sport 130 w/40 hp Merc
    On four minutes before starting the genny - genny runs the entire time away from the dock - back into the dock and shut down genny, and shut down blowers four minutes later.

    I also confirm air is coming out both port and starboard blower vents. If a blower takes a dump, who cares - easy to replace, inexpensive, and cheap insurance.
    JVM225 likes this.
  6. Blueone

    Blueone Well-Known Member GOLD Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's

    Gas.. without exception ..I always did a smell test by opening the engine hatch before putting the blowers on.... always. A person made your fuel system. People make mistakes
    Captn TJ likes this.
  7. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy
    3126 Cat's
    I turn mine on when we idle down and have 10-20 minutes before we are tied to a dock... Heat dispersion for us.
  8. Windjammer

    Windjammer Active Member SILVER Sponsor

    Nov 10, 2007
    Marietta, GA
    340 Sundancer 2006
    8.1 Mercruiser V-Drives
    S.O.P for me:
    Raise hatch/smell test
    Blowers on for a full 4 to 5 minutes.
    Start genset.
    Start Engines.
    Lower Hatch.
    Blowers stay on until we return to the dock and are the last things off.
    The fumes from 1/4 cup of gasoline are equal to 15 sticks of dynamite...
  9. MiLoII

    MiLoII Member

    Jul 14, 2017
    Southern Lake Michigan
    320 Sundancer 2005
    Previously 300 Doral 1999
    350 Mag MPI Inboard V Drives
    4 minutes minimum before every start and sniff test i do not run blower while underway. One of my peeves is when gas dock attendants try to rush you off the dock well before 4 minutes.
    Little Ducky likes this.
  10. Jimmy Buoy

    Jimmy Buoy Well-Known Member

    Dec 3, 2008
    Sarnia, Ontario, Canada
    340 Amberjack
    twin 8.1S 370 Hp + 4.5 Westerbeke Genset
    Yes, use your head but also use your nose. I do a quick check of the ER using the day hatch looking for oil leaks or the smell of fuel before firing the engines. Blowers on when less than planing speeds too. Got rid of my noisy blower by swiping it out for a squirrel cage type - much quieter and can be run continuously is desired. It's a good item to have for running the genny on the hook.
  11. FastMarkA

    FastMarkA Active Member

    Jul 12, 2010
    2015 Sunseeker Portofino 40
    Volvo Penta D6-330
    Unfortunately, most of the guys and gals who didn't run their blowers can no longer tell us why they made that decision. RIP.

    Is 4 minutes of a subtle "whine" really that much of an inconvenience to prevent an explosion?

    Gasoline vapors are explosive, period. There's a reason ABYC makes blowers a required equipment item on boats with an inboard gasoline engine.

    Please be responsible and use your blowers, or get a diesel-powered boat.
    Wave Rider likes this.
  12. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    IMG_4230.JPG Yes. I do run it as well as sniff before turning the keys. Also at the fuel dock even telling the kids pumping gas to slow down and not rush the process. Many of them do not seem to read the signs posted about fueling safety procedures.
    MiLoII likes this.
  13. JimT

    JimT Well-Known Member GOLD Sponsor

    Jul 7, 2009
    Charlotte, NC- LKN
    2010 330 Sundancer
    T-350mags w/BIIIs & Axius, 5.0 kw Kohler
    I do. Replaced the Atwood inline blowers with Jabsco squirrel cages. Can barely hear them.
    Groucho and insfnds like this.
  14. Fly'n Family

    Fly'n Family Active Member

    Sep 19, 2013
    TX / CO
    2008 Meridian 341
    2004 Boston Whaler Sport 130 w/40 hp Merc
    insfnds likes this.
  15. FootballFan

    FootballFan Well-Known Member

    Jun 20, 2012
    Marquis 59
    MTU Series 60
    Gas or Diesel - it changes how I use a blower.

    When I had a Gas boat (340 DA) I ran the blower for 4-5 minutes before starting the engines. Maybe overly cautious, but a friend I grew up with spent a month or so in a burn unit and carries permanent scars from a flash that occurred because gas fumes had accumulated.

    Diesel, somewhere around the time I start the engine I turn on the blowers. Usually when I start the genset the blowers go on, switches are together and it is an easy reminder.

    Blowers run the whole time the mains are running. After shut down of the mains and the genset, usually run the blowers another 10-20 minutes at least. Depends on how hard we have been running and the ambient temp. Very hot weather and long hard runs, I don't mind the blowers going for 30 minutes after shutdown.

    My opinion, heat in the engine room significantly impacts battery life. I really do not want batteries sitting in the heat any more than they have too.
    Robski97 likes this.
  16. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    This plus I have a fume detector in the engine room. Every boat with an enclosed engine and/or fuel tank should be required to have one.
  17. Chip S

    Chip S Member

    Jun 17, 2019
    Bordentown, NJ
    1993 Sea Ray 200 Overnighter
    1993 Mercury 150 hp Black Max Outboard
    When I had an inboard I would start the blower during my engine checks (oil, transmission fluid, etc.) and leave them on until I was putting the boat away for the day. My engine was so loud that once I started the engine no one could hear the blower! :D
  18. Handsome Transom

    Handsome Transom Active Member GOLD Sponsor

    Jan 26, 2018
    Penetanguishene Ontario Canada
    1989 SeaRay Sundancer 268 454 Bravo
    454 Mercruiser bravo drive
    I always open the hatch on the ER and check fluids and look for anything our of the ordinary first startup when getting to the boat if I smell no vapour I dont usually bother,I do run them before a hot start and I do run the blowers 4 min and idling away from fuelling
  19. yobub

    yobub Active Member

    Jul 29, 2016
    1998 400 Sundancer
    Cat 3116's
    I run my blower. Easy to do.

    We had a boat blow up in a harbor near me last year. Just fueled up. VERY experienced boater, hard core recreational fisherman. Probably got complacent. He died, his buddy was seriously injured.
  20. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer, Raymarine C80 suite with radar, Mercury 310 Hypalon w/8hp Yammie 2stk
    2X 454 carbs w/ vDrives
    When I am heading out on the boat, as soon as I get on board I flip the blower switch. Then it runs while I get the canvas off and stow gear etc and untie the extra lines and disconnect shore power. Then I sniff the air coming out of the vents before starting the engines. SOP for me. Doesn’t add any time. I do turn them off while running though. Probably should rethink that. At the fuel dock, as soon as they finish fueling, the blowers go on again while paying etc. So they run about 4 or 5 minutes before restart. Again, smelling the air coming out the vents before.
    Last edited: Nov 8, 2019

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