07 Merc 496Mag HO-Fuel Purge? Jim, help me to understand!
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07 Merc 496Mag HO-Fuel Purge? Jim, help me to understand!

  1. #1
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    Default 07 Merc 496Mag HO-Fuel Purge? Jim, help me to understand!

    I had issues this past weekend and not sure whats happening- Will leaving off gas cap get air in the fuel line with a need to have that purged? My son had left both tanks empty over the winter and first time out both tanks were on E but it started ok and I ran it to a gas dock and filled up -my nephew left one of the gas caps off and while backing the boat out it stalled-tried and tried to start it after 25 minutes and with starter spray would not run? Had a mechanic check it and within an hour back on the water Mechanic said he had to purge the fule line-I never did find if it was from the cap off or the low on E thing -a few days later I ran to E on a tank and the boat stopped running- the boat did the same thing would not start after switching to the full tank but finally after 20 tries and using some starting fluid I got it to start and finally run -when switching tanks from E to full is this typical not to start at first if I did run out of gas-how can I purge the line like the mechanics do if this happens again? or am I not understanding any of this and completely off base? any info will help for future peace of mind

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    Well, I am not JW, but it's real simple to do.

    When I change the fuel filter (emptying the fuel in the line), I just leave the cap on the tank (non vented cap) and put a rag around the outboard vent head and blow compressed air into it. This pushes the fuel right up to / and into the fuel pump. Then just cycle the key a few times.

    As you go to start the boat (ignition key to start), the injectors will bleed off any remaining air into the motor and fuel will follow.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    I have a 07 magic 28' deck boat- I wonder where that fuel vent is?

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    Quote Originally Posted by electros View Post
    I have a 07 magic 28' deck boat- I wonder where that fuel vent is?
    Walk around the boat. It is either anodized the same color as your other hardware, or just polished. It will be a round piece, about 1" diameter with a hole in it - probably pointed downward. On boats with one tank, it is usually near the fuel-fill.

    EDIT: Oh, and it will smell like fuel.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    I keep the boat at my Place in Havasu Springs-will check when I go back maybe on the 4th-

    I just do not recall seeing that type of drain thing with the down turned type spout maybe its just a round drain looking chrome piece type-

    Whats the top speed for your boat?

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    Quote Originally Posted by electros View Post
    I just do not recall seeing that type of drain thing with the down turned type spout maybe its just a round drain looking chrome piece type-

    Whats the top speed for your boat?
    Oh, it's there. Trust me. On mine, it mid-ship along the sides. On a friend's Shockwave, with single-tank, it's at the back (transom).

    I have hit 68 with two people, half fuel, cold day, etc.

    Real-life performance is 60-62 on a hot day with 8-10 adults, ice chests, full fuel.

    Most of my crew doesn't like to go much past 40-45, so it spends most of its life at 35-40 cruise.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    just out of curiosity was ur boat not running at the fuel dock at havasu city?

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