K Valve "pump Saver" Question

Discussion in 'PSI Superchargers Tech Questions' started by shawn davis, Dec 24, 2007.

  1. shawn davis

    shawn davis Member

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    Is A Pump Saver Line And Poppet Needed On A Typical Roots Blown 16 Gpm Fuel System? My Fuel Pressure Sensor Is In The Distribution Block And I've Never Monitored Main Line Pressure When The Throttle Closes.
     
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    shawn davis, Dec 24, 2007
  2. craig moss

    craig moss Member

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    pump saver

    I have heard after a burn out or after a run when the throttle is slammed shut and the rpm is high the psi spikes and could damage the pump I think they are normally set at 100 psi but not sure and I think it only pops off when the throttle is shut good luck merry christmas craig moss:cool:
     
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    craig moss, Dec 24, 2007
  3. aj481x

    aj481x Member

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    Plumb the line into the hat fittings, saves the pump and keeps blower from running dry. Can't hurt. :)
     
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    aj481x, Dec 24, 2007
  4. Mike Canter

    Mike Canter Top Dragster
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    What is the highest pump pressure you have seen with any of your tuneups. Ours pops at 230 psi. You do not what to go too low like 100 psi or 175 psi because anytime your pump pressure gets to 100 psi or 175 psi it is going to dump a bunch of fuel. If you have a temp probe in the manifold you can see the temp drop 140* immediately when it pops. A common set point is 200 psi.
     
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    Mike Canter, Dec 24, 2007
  5. bobbyblue359

    bobbyblue359 New Member

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    Shawn, Mike is right. Ours was originally set at 200#, but since we're using a bigger pump and upped the pressure to 180# at 10,200 rpm, we moved it up to 240#. It only works at high volume/low demand senarios,(re:high rpm with little-no throttle opening), and it's only there to keep pump/pump drive alive with no damage. Call Jim Myers at Kinsler and he'll put you straight on how/why/how much/how to.
     
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    bobbyblue359, Dec 24, 2007
  6. mark6052

    mark6052 Member

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    maybe I dont understand how my BV works? I thought on the k-stlye the overpressure does not work at WOT. only when you let off throttle does it route fuel that way. mine is set at 160psi. fuel pressure never gets that high. but I run an old HH blower. 6.50s stuff. :confused:
     
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    mark6052, Dec 24, 2007
  7. aj481x

    aj481x Member

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    Mark, you are correct.
     
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    aj481x, Dec 25, 2007
  8. Mike Canter

    Mike Canter Top Dragster
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    It will work at WOT if the pop pressure is exceeded by the pump pressure which can happen if it is set to low. The trouble is this can happen without you knowing it unless you record the fuel pressure on a data logger and recognize the fuel pressure drop that occures when the pressure rises to a certain point.
     
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    Mike Canter, Dec 25, 2007
  9. JM

    JM Member

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    I know what you're saying, that the one front port on the K BV is in literature designated as the "pump saver" port. And fuel is directed there via a passage on the barrel at closed throttle. But, it is not an O-ring sealed passage. When system pressure reaches the specified (by poppit) point, that pump saver port will release pressure at WOT. I've run a high speed off that port that worked well. Hope this is the input you were looking for?
     
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    JM, Dec 25, 2007
  10. aj481x

    aj481x Member

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    We have observed this condition many times on the pump stand, usually there is little fuel from this port but sometimes a measurable amount. All our system return this fuel to the hat, so there is no difference in the amount of fuel delivered to the engine, but agreed that a small amount would not go through the flow meter. We normally set this poppet to the high end of the anticipated pressure and let it go at that.
     
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    aj481x, Dec 25, 2007
  11. a/fd slngsht

    a/fd slngsht Member

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    ok.... i'm confused also.... i thought the pump saver port worked just like the idle port where it only opened the port at idle or part throttle but it closed it at full throttle....mike
     
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    a/fd slngsht, Dec 25, 2007
  12. Eric David Bru

    Eric David Bru Member

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    That's what I thought too but apparently there is some internal leakage that occurs at high pressures.

    EDB
     
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    Eric David Bru, Dec 25, 2007
  13. shawn davis

    shawn davis Member

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    Saver

    Thanks Guys, Pretty Much Answers The Question. I'll Keep It Going To The Hat Block.
    Does The Billet Gorr Valve Use One Also? Or Do You Tee Off Somewheres For It?
     
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    shawn davis, Dec 26, 2007

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