Results 1 to 7 of 7

Thread: FUEL PSI FLUCTUATING

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496

    FUEL PSI FLUCTUATING

    WHAT WOULD CAUSE MY FUEL PSI TO CHANGE?I SET IT AT 7.5 ONE DAY THE NEXT TIME I RUN IT ITS 6 OR 8,MONDAY WHEN I STARTED THE CAR IT WAS 12.I USE A HOLLEY BLUE PUMP,AEROMOTIVE PSI REGULATOR AND A AEROMOTIVE FUEL FILTER (10 MICRONS).A BRAIDED FUEL LINE AND A AUTOMETER LIQUID FILLED FUEL PSI GAUGE.

  2. #2
    Senior Member RACING JUNKIE mytmouz's Avatar
    Join Date
    May 2006
    Location
    Pelahatchie, MS
    Posts
    980
    The liquid filled gauge is usually the cause. Drain it and see if it stays put before you do anything else...
    If you think nobody cares, try missing a payment...

  3. #3
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496
    Quote Originally Posted by mytmouz
    The liquid filled gauge is usually the cause. Drain it and see if it stays put before you do anything else...
    HOW DO I DRAIN IT?

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    Man I wouldn't drain that, lol...

    Did you orient the fuel pressure gauge to where the vent plug in back is at the top? Is the plug loose? Liquid filled gauges have to be vented, or as atmospheric pressures change, the gauge will be thrown off by expansion/contraction of the oil in them.
    -WJ Birmingham

    OneBadGMC.com

  5. #5
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496
    AS I SIT AT MY DESK I WAS REMEBERING THE LAST TIME I RACED,WHEN I STARTED THE CAR PSI WAS AT 6 I DIDNT ADJUST BECAUSE THE DAY BEFORE I SET IT AT 7.5.WHEN I MADE A PASS IT WAS ACTING FUNNY LIKE IT WAS STARVING FOR FUEL.I ADJUSTED IT TO 8 PSI AND IT RAN FINE,IM THINKING THE PSI REGULATOR COULD BE BAD OR MAYBE SOMETHING STUCK IN IT.

  6. #6
    Senior Member SENIOR BUILDER
    Join Date
    Nov 2007
    Location
    Tukwila, WA
    Posts
    115
    I would look at the regulator.

  7. #7
    Senior Member RACING JUNKIE TheRabbit's Avatar
    Join Date
    Jan 2007
    Location
    Augusta, Ga.
    Posts
    2,295
    Check the guage. I use 2, one on the regulator and 1 on my cowl.( attached in-line at the reg.) They never read the same. One on the dash always shows 6.5, the reg (new BG) always shows 7.5.
    Every now and then the one mounted outside gets hung up at 3 or 4psi.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy