Click for Nordhavn Click for Abeking Click for Westport Click for Cross Click for Abeking

fuel consumption

Discussion in 'Carver Yacht' started by Peter54, Dec 28, 2015.

You need to be registered and signed in to view this content.
  1. Peter54, Dec 28, 2015
    #1
    Peter54

    Peter54 New Member

    Joined:
    Dec 28, 2015
    Messages:
    1
    Location:
    Lake SImcoe
    Gentlemen,
    Purchased a 1989 34 Carver Santego this past summer..she has a pair of 7.4 Mercruisers , each with approx 1100 hrs on it. Both engines need a lot of cranking and pumping to get them going, but when they do go they idle and cruise nicely, however, there seems to be a little stream of what looks to be unburnt fuel coming from the port exhaust, and that engine is constantly coughing and farting at higher rpm and is unable to pull past 3700 prm. Starboard side will pull cleanly thru 4400 and sounds sweet. I have changed everything, so new wires,plugs ( the correct heat range),cap, rotor, cleaned the rust out of the distributors, and made sure the chokes pull off and that the spark arrester is spotless, the only thing left is the carb...and the boat drinks fuel, almost double the fuel consumption of my old boat..a 31 Trojan with a pair of 318's..any ideas??
    thanks in advance... Pete.
  2. justold, Dec 28, 2015
    #2
    justold

    justold Member

    Joined:
    Feb 23, 2009
    Messages:
    51
    Location:
    new jersey , fla
    Tune up 101 ! Do a compression test . That is step #1 when doing a tune up , other wise you are only throwing money and time at it . You must have a base line to start from .
  3. Capt J, Dec 28, 2015
    #3
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,517
    Location:
    Fort Lauderdale
    After compression test, check fuel filters and rebuild/change carbs. Quadrajet carbs if that's what you have, have an issue where the bowls will leak into the motor when shut off when they need to be rebuilt.
  4. g36, Dec 29, 2015
    #4
    g36

    g36 Member

    Joined:
    Aug 7, 2013
    Messages:
    70
    Location:
    chattanooga
    you cleaned out the rust in the distributors. did you check the timing?what kind of advance are you getting?
    agree check compression and fuel filters too