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Conference vicki::boats

Title:Powerboats
Notice:Introductions 2 /Classifieds 3 / '97 Ski Season 1267
Moderator:KWLITY::SUTER
Created:Thu May 12 1988
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1275
Total number of notes:18109

1085.0. "351 PCM Fuel problems" by 5062::OLSON () Tue Jul 27 1993 09:42

    
    
    I need some help on a problem with a 83 master craft with the 351
    pleasurecraft engine and holly four barrel.
    
    about three weeks ago it started cutting out when pulling a skier.  By
    testing we found that after a couple laps around the lake at full
    throttle it would do the same thing, stumble then quit.  
    
    So, I 've replace the fuel filters, cleaned out the carb ( minor dirt) 
    replace the fuel pump and removed and cleaned the fuel tank.  Still the 
    problem persists.
    
    It seems that when the bowls get depleted there is not enough fuel
    getting in at a fast enough rate to keep the engine running under full
    power.  At low to medium power settings it will run all day with no
    problem.
    
    Any suggestions ???
    
    
T.RTitleUserPersonal
Name
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1085.1SOLVIT::CHACEMy favorite season is getting nearer!Tue Jul 27 1993 10:119
    
      Are you absolutely certain that you got ALL of the fuel filters?
    
      You could have a restricted fuel tank vent.
    
      It could also be electronic/heat related
    
    					Kenny
    
1085.2RANGER::OLSONTue Jul 27 1993 13:4410
    
    
      Well, I got the inline water filter and the small screen at the carb. 
      I had not given the vent any thought though, Ill check that this
    evening.
    
    
    
      thanks
    
1085.3more stuff to checkSALEM::LAYTONTue Jul 27 1993 14:469
    It's remotely possible that any rubber tubing on the intake side of the
    fuel pump is collapsing from the suction.
    
    What about vapor lock?  Are the fuel lines near the engine well
    insulated/away from the hot engine?
    
    Are the floats in the carb correctly set?
    
    Carl
1085.4check the checkSTOWOA::SBAKERWed Jul 28 1993 13:469
    There is a check valve in the fuel tank that gets pluged.  This very
    same thing happened to a friends boat last year and this is what I
    found to be the problem. I know that my Nautique has one and most of
    the other boats use them to stop the gas from siphoning back to the
    tank. Check it out, Its located on top of the tank and its a ball type
    check that crud in it and and won't open all the way. Let me know if
    I'am wright, I love when that happens. 
    
    Steve
1085.5clean and replace.USCTR1::BORZUMATOWed Jul 28 1993 14:1011
    
    NO NO NO< its and anti-siphon valve to keep it from being
    
    siphoned to the engine in case of a fire.
    
    Simple, when ther's no pressure on it, it shuts off the supply.
    
    and yes they can get full of crud, just clean out and put back.
    
    
    JIm
1085.6check out whatever its calledSTOWOA::SBAKERWed Jul 28 1993 16:385
    In the one that I fixed in the same type of boat with the same exact
    symptoms had nothing to do with pressure. The fuel is pulled through it
    and checks tight back in the direction of the tank.
    
    steve
1085.7looks like the tank area.5062::OLSONThu Jul 29 1993 13:0716
    
    
     Well some progress was made last night.  To help isolate the problem I 
    put a new fuel line on at the fuel pump and ran it into a gas can, ran
    like new.  So, this supports all of the ideas so far.  I then ran the
    new line to the tank and tried again, same old problem.  I took off the
    vent line to rule out that, same problem.  by this time it was 10:30
    last night so.....  tonights drill is to take out the fitting with the
    check valve and bypass the water filter to remove it from the picture.
    
    more as the saga unfolds............ this not sking is getting rather
    irritating, startinglooking through the want advertiser last night with 
    my wife glaring at me.
    
    
     
1085.8it was the water seperatorRANGER::OLSONFri Jul 30 1993 13:4315
    
    
      Well, it turns out to be a problem in the water seperator and
    associated plumbing.  When I removed the water seperator from the 
    fuel line by placing a simple in line fliter in its place all was 
    well again.  So I've got the whole assemply off and am going to clean 
    it and replace the filter ( the current one is only a month old ).
    
    The carb is also out for a rebuild. It was still acting a little 
    strange at idle and 2000-2500 rpm.  The rebuild is only $85.
    
    thanks for the suggestions.
    
    mark
    
1085.9Carb. rebuild ?STOWOA::SBAKERFri Jul 30 1993 16:193
    Glad to you got it fixed. Happiness is a ski boat that runs. Where are
    you getting the carb rebuilt?  I would like to get mine done after this
    season.
1085.10Hobb's in Pelham, NHSALEM::NORCROSS_WMon Aug 02 1993 09:4410
    I took my 26 year old (and very obsolete, ie: no rebuild kit available)
    Carter ABD two barrel to Hobb's in Pelham, NH. (28 Windham Rd, RT 111,
    right near the police station, 603-635-2415).  They had it rebuilt for
    $45 in three days.  I put it back on the boat and it started right up. 
    I didn't even have to adjust it but maybe that was a fluke.  The last
    time I had it rebuilt ( I left untreated gas in it for 1.5 years) I
    shipped it out to Michigan to a guy who specializes in obsolete marine
    carbs.  Cost me $125 plus UPS shipping.  Glad I found Hobbs!!
    I can give you better directions if you are interested.
    Wayne
1085.11MKOTS3::RONEYMon Aug 02 1993 10:0419
    Mark,
    
    One thing I would checkout in your case would be the potential for
    getting bad gas, or contaminated. From reading what you are telling us,
    the fuel/water seperator filter is only a month old, I would say you
    could have some crud in your tank. Those filters are fairly big and can
    handle alot.
    
    As far as the check valve in the fuel line goes. I hand the same
    problem with my boat when I first got it. It would run o.k. until you
    nailed it and it would sputter and cut out. I took it back to the
    dealer and they knocked the ball out of the inline check valve and
    things have been fine ever since except for the metering rods in the
    carb. One thing tha tIs an after effect after taking out the ball in
    the check valve is you have to pump the throttle quit a bit when you
    start it up. That's because the fuel will run back to the tank and you
    are fully priming the system again before it starts.
    
    Bob
1085.12I think I'm ready for a tradeRANGER::OLSONTue Aug 03 1993 13:3413
    
    
    
    The carb went up to Hobb's, mentioned in an earlier not.  I had taken
    the check valve out of my other boat when it left me stranded.  I never
    associated the new need to pump the throttle to start it with the check
    valve gone !  I do remember never having to do that though prior to 
    remove the valve.
    
    Well there is also a hole in the hull that I discovered when taking the 
    floor panel up.  It's right where the transmission is bolted in. So
    I've sort of given up.  Thursday night I'm going to look at an 88
    mastercraft with the 454 and a powerslot.
1085.13351 PCM Fuel problemsSALEM::NORCROSS_WWed Aug 04 1993 09:095
    I have an empty trailer sitting in my yard if you need me to haul away
    what's left.  I'll even do you a favor and pick the carb up at Hobb's.
    I work nearby.  I won't even charge you my normal "trash hauling" fee.
     
    Wayne (always here to help out my fellow boaters :-)