Loss of Fuel Volume During Run

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Mlittle, Aug 3, 2017.

  1. Mlittle

    Mlittle New Member

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    Hi,
    At the Gatornationals this year, we took at a burst panel, and upon closer inspection....expensive engine damage.

    We discovered (on the computer) that 2 seconds into the run we lost 3 gallons of flow at the flow meter, engine went very lean at the gear change.....and boom.

    We think we know what caused it, but I would like to hear what some of you have experienced....I want to try and avoid a repeat.

    What do you think??

    Thanks!!
    ML
     
    #1
  2. kosky racing

    kosky racing Comp Eliminator

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    what are to look at?
     
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  3. Mlittle

    Mlittle New Member

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    Fuel flow was following engine RPM, at 2 seconds the flow dropped 3 GPM. leveled out for the most part......

    We think the fuel shut off vibrated, and closed part of the way.

    We also flowed the pump, same numbers as last time we flowed it.

    Just want to make sure there is nothing else going on.
     
    #3
    Mike Canter likes this.
  4. jay70cuda

    jay70cuda Member

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    You don't tape the shut off open? So that can't happen?
     
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  5. Mike Canter

    Mike Canter Top Dragster

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    I use duct tape in half strips on Adams. Never make a run with it taped.
     
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  6. Mlittle

    Mlittle New Member

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    The shut-off and cable/lever is tight....has never been a problem....til now.
    I now have an over center spring, and I will use tape too.
    Are there any other things I should check?
     
    #6
  7. h2b puller

    h2b puller Member

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    check if your vent on the fueltank is big enough/open.
     
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  8. bob szabo

    bob szabo FC / altered

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    Also check your tank to fuel pump feed line with any hoses for possible collapse from a kink in the line, engine mounting shift from loading causing a kink, or an internal blader separation.

    If there are any hoses in the connection and they are old, you may want to put a new one on or mount a large ss spring inside to keep it from collapsing. If it is old and collapsing, a leak may be in the near future.

    Bob Szabo
    bob@racecarbook.com
    https://racecarbook.com
    https://airdensityonline.com
     
    #8
  9. Mlittle

    Mlittle New Member

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    Great....thanks for the ideas!
     
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  10. Comax Racing

    Comax Racing Member

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    You don't really mention if this is a new car but is your tank vent big enough? A friend of mine had inadequate venting on his fuel car (we discovered) imploded the tank and blew the engine and tank sky high. When the engine quit it sucked the fire into the tank and boom.

    Corey
     
    #10

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