help with fuel line size

Discussion in 'PSI Superchargers Tech Questions' started by rowalton, Mar 14, 2011.

  1. rowalton

    rowalton New Member

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    high looking for some help with fuel line size wiil a 12 an line feed a fuel injection here is some info on motor 540 11.5:1 871 blower 10 lbs boost has 760 pump 11.4 gpm @ 4000rpm has b&u 4 3/8 bf running 1/8 car will run out of fuel before the run is over it has 12 line from the cell with a 45 on one end and a 90 on the other has a 8 an feeding the barrel valve thanks
     
    #1
    rowalton, Mar 14, 2011
  2. nmro2114

    nmro2114 Member

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    what type of vent do you have on the tank?
     
    #2
    nmro2114, Mar 14, 2011
  3. craig moss

    craig moss Member

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    How long is the 12 hose from the tank ??
     
    #3
    craig moss, Mar 14, 2011
  4. rowalton

    rowalton New Member

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    it is venting trhough the roll over vent
     
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    rowalton, Mar 15, 2011
  5. rowalton

    rowalton New Member

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    the hose is 10" long
     
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    rowalton, Mar 15, 2011
  6. Comax Racing

    Comax Racing Member

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    Fuel Line Size

    I have a very similar system to yours and I use a 1" line (-16) I do use on size larger pump (110 over the 760) but a 12 seems a little small. I then use a -10 tank vent. I would look at trying to up size the inlet line size. The vent is almost as importants as the inlet, (some will say more important) so up size it as well.

    My 2 cents
    Corey
     
    #6
    Comax Racing, Mar 15, 2011
  7. SoDak

    SoDak Active Member

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    Do your returns (idle, high speed, etc) go back to tank or directly in front of the pump?
     
    #7
    SoDak, Mar 15, 2011
  8. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    glug

    First make sure your tank is adequately vented by doing the highly precise and scientific 'glug' test. Tank the tank out of the car, fill with water, and turn it down to let it gravity pour out of the outlet with the cap on. If it 'glugs' when you're pouring, it doesn't have a big enough vent.

    If you are using a conventional steel braided/rubber AN 12 line, that could be the problem there. You need to have at least a reinforced hose or a hard line. The pump could be sucking the line closed.

    Also, make sure it's not sucking air somewhere. That will cause major cavitation problems.
     
    #8
    Will Hanna, Mar 15, 2011
  9. rowalton

    rowalton New Member

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    the pump saver and idle returns run back to the tank and the shut off is on a loop line goes back to the inlet side of the pump
     
    #9
    rowalton, Mar 15, 2011
  10. rowalton

    rowalton New Member

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    ok thanks for the help i am going to go with 16an line and i will put a bigger vent but i will keep you all posted thanks
     
    #10
    rowalton, Mar 15, 2011

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