Fires but dies
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Fires but dies

  1. #1
    oldelim
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    Default Fires but dies

    Big Block Chevy, MSD Ignition, Coil, Holley Double Pumper. Boat running down river starts to cut out, eventially dies. Boat would fire but immediatly dies. Mechanical Fuel pump is providing sufficient fuel as per fuel pressure gauge. I replaced the coil. I thought maybe alternator but after charging battery to full charge, it still fires and then immediatly dies. Will MSD box run on full charged battery or could my alternator be bad. Any help, thoughts on what to check would be appreciated.

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  3. #2
    Ain't Right Racin piston in the wind's Avatar
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    Wire up a light to the run circut and keep and eye on it. Sounds like the run voltage is intermittent and the cranking votage is doing its job. Run a hot from a good supply and try it.

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    Senior Member EVILFORCE's Avatar
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    No Fool Like A Old Fool is there?

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  6. #4
    oldelim
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    No balast resistor on this one

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    Senior Member steadymobbin's Avatar
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    some trash in the carb? there may be something stuck in the needle

  8. #6
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by rodum View Post
    Big Block Chevy, MSD Ignition, Coil, Holley Double Pumper. Boat running down river starts to cut out, eventially dies. Boat would fire but immediatly dies. Mechanical Fuel pump is providing sufficient fuel as per fuel pressure gauge. I replaced the coil. I thought maybe alternator but after charging battery to full charge, it still fires and then immediatly dies. Will MSD box run on full charged battery or could my alternator be bad. Any help, thoughts on what to check would be appreciated.
    Quote Originally Posted by steadymobbin View Post
    some trash in the carb? there may be something stuck in the needle
    The gauge can show pressure but the needle and seat might be stuck. There could also be a fuel filter issue depending on where the gauge reads pressure.

    With the needle and seat sticking, you might be able to feather the throttle and keep it running a few more seconds from fuel in the accelerator pumps.

    Voltage is critical with an MSD, and related to that check your MSD box connections, and particularly the ground. The heavy red and black leads are supposed to be connected directly to the battery.

  9. #7
    Just Me snoc653's Avatar
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    Does it start back up and run fine later? It is possible the coil is going bad, small trash in the carb, as pointed out already, possibly the ignition box is going bad, or a combination of things. I'd lean toward the coil or MSD box going bad.
    So many projects, so little time

  10. #8
    oldelim
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    cleaned fuel filter, removed and inspected fuel pump (holley 130 flow mechanical) as a first remedy. Fuel Pressure Gauge is at the carb as part of Mallory Pressure Regulator. Im moving away from fuel source and will pull and clean carb next (needs to be done anyway). If that does not solve, given I put a new coil on, I'll be checking all wiring carefully to rule out poor ground etc. MSD box big black and red wires are straight to battery, no apparent loose connections I can find. I'll have the alternator bench tested. Gremlins

  11. #9
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    Quote Originally Posted by rodum View Post
    cleaned fuel filter, removed and inspected fuel pump (holley 130 flow mechanical) as a first remedy. Fuel Pressure Gauge is at the carb as part of Mallory Pressure Regulator. Im moving away from fuel source and will pull and clean carb next (needs to be done anyway). If that does not solve, given I put a new coil on, I'll be checking all wiring carefully to rule out poor ground etc. MSD box big black and red wires are straight to battery, no apparent loose connections I can find. I'll have the alternator bench tested. Gremlins
    MSD has a good test procedure on there site to see if its the box. Intermittent is another thing.

  12. #10
    Senior Member jet460's Avatar
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    Do the easy stuff first.

    Put the key in the "run" position and check for 12v at the + terminal on the coil.

    If no, check switch continuity.
    100 years from now, none of this will matter.

  13. #11
    Senior Member steadymobbin's Avatar
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    Quote Originally Posted by jet460 View Post
    Do the easy stuff first.

    Put the key in the "run" position and check for 12v at the + terminal on the coil.

    If no, check switch continuity.
    K.I.S.S ------> Keep It Simple Stupid! my teacher taught me this in 6th grade. i was like, "hey teach, im not stoopid"

  14. #12
    Senior Member moneysucker's Avatar
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    Ignition switch may be bad. $14 at Kragan. I would try starter fluid and see if that may help it run. If so, It is carb.
    Vinyl Graphics, Magnetic signs, Reg #s, Boat names, Banners, Boat decals, Etc. Please contact me Via facebook or e-mail [email protected].

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    I had the same type of symptons that you had. Turned out to be a problem with the tachometer. Replaced the tach and no more problem.

  16. #14
    Member blownrat505's Avatar
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    Default msd

    had same problem with mine last year,went thru all the testing msd,went thru the carbs, and all wiring, ended up being cap and rotor, even if they look OK try that first too. (Thanks to the MSD tech line help.)

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