Vapor locking

Discussion in 'Fuel and Air Systems' started by KJoeZ61, Sep 15, 2018.

  1. KJoeZ61

    KJoeZ61 Well-Known Member

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    My 71 Scamp with a 360 had a bad summer vapor locking. I tried different insulators and it made an improvement with "Coolcarb". Would switching to an EFI system like the Holley Sniper help?
     
  2. jrcr_15

    jrcr_15 Well-Known Member

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    EFI systems like the sniper and Fitech are more prone to vapor locking than a carb system to my understanding.
     
  3. KJoeZ61

    KJoeZ61 Well-Known Member

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    Really? I thought EFI was the cure to the alcohol problem! As I sit here drinking a beer!!!
     
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    • duster360

      duster360 FABO Gold Member FABO Gold Member

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      EFI will end the vapor locking. Holley Sniper EFI, in my opinion, is the best.
       
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      • RustyRatRod

        RustyRatRod Just another dumbass. FABO Gold Member

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        A well thought out fuel return system will also put an end to it.
         
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        • QuickDart360

          QuickDart360 Well-Known Member

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          No need for efi. Just put a return set up as mentioned by Rusty. Maybe try to also get fresh air to air filter. Isolated fresh air that is. Like a ram air style system.
           
        • KJoeZ61

          KJoeZ61 Well-Known Member

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          Rusty,

          Are you referring to an electric fuel pump?
           
        • fjr

          fjr Well-Known Member

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          EFI eliminates vapor lock by pressuring the fuel at the fuel tank. You can also eliminate vapor lock in a carbureted engine with an electric fuel pump by either replacing it completely or using the electric pump to prime the mechanical pump.

          See Vapor Lock.

          The following video shows how vapor lock develops in the fuel pump.
           
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