Null


Pages: [1]

79charger

  • Karma: +0/-0
Fuel Preesure while under load
« on: April 24, 2011, 01:24:17 PM »
Have a BBF  with Holley 750 street avenger with vacuum secondaries , Holley red fuel pump , and a electric "helper pump" . have 6-8 psi at idle , drops to zero at full throttle 4200 rpm and the rpms bounce up and down from 3900 to 4200 like it is not getting enough fuel to maintain ...... BTW all new parts . Thanks guys
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

Ralph Brunt

  • Karma: +51/-0
Re: Fuel Preesure while under load
« Reply #1 on: April 24, 2011, 01:53:29 PM »
what size lines?

sounds like a bad fuel pump
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

CHEAP, FAST, RELIABLE...PICK 2 CANT HAVE ALL 3
Quote
They are all fukin tasty. My long time favorite, "Dirty Dicks -beerjet-
Quote from: IRRebel on February 16, 2010, 06:11:01 PM
Glasscutter, Skip, OC2  Nordie and many more nail me good every time, relentlessly, I love those guys!

ka0tyk

  • Karma: +30/-0
Re: Fuel Preesure while under load
« Reply #2 on: April 24, 2011, 01:56:42 PM »
have u tried it without the "helper pump"?
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

79charger

  • Karma: +0/-0
Re: Fuel Preesure while under load
« Reply #3 on: April 24, 2011, 01:59:53 PM »
3/8 Fuel Line , I never run the helper pump except to prime the motor after it sitting . Could the electric fuel pump be bad or slowing down the fuel flow from the mechanical one ???
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

Ralph Brunt

  • Karma: +51/-0
Re: Fuel Preesure while under load
« Reply #4 on: April 24, 2011, 02:04:40 PM »
Quote from: ka0tyk on April 24, 2011, 01:56:42 PM
have u tried it without the "helper pump"?
thats what im thinking, try one pump at a time.... hell get a good mech pump and dont look back

remove the unused pump to try the other
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

CHEAP, FAST, RELIABLE...PICK 2 CANT HAVE ALL 3
Quote
They are all fukin tasty. My long time favorite, "Dirty Dicks -beerjet-
Quote from: IRRebel on February 16, 2010, 06:11:01 PM
Glasscutter, Skip, OC2  Nordie and many more nail me good every time, relentlessly, I love those guys!

ka0tyk

  • Karma: +30/-0
Re: Fuel Preesure while under load
« Reply #5 on: April 24, 2011, 02:14:16 PM »
Quote from: 79charger on April 24, 2011, 01:59:53 PM
3/8 Fuel Line , I never run the helper pump except to prime the motor after it sitting . Could the electric fuel pump be bad or slowing down the fuel flow from the mechanical one ???

the mechanical pump is probably struggling to suck the fuel thru the impeller of the electric one when its not on. 
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

79charger

  • Karma: +0/-0
Re: Fuel Preesure while under load
« Reply #6 on: April 24, 2011, 04:39:41 PM »
Ok I will remove the electric pump then ..... Should the pressure stay 6-7 while a load is on the motor?
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

Ralph Brunt

  • Karma: +51/-0
Re: Fuel Preesure while under load
« Reply #7 on: April 24, 2011, 05:14:46 PM »
Quote from: 79charger on April 24, 2011, 04:39:41 PM
Ok I will remove the electric pump then ..... Should the pressure stay 6-7 while a load is on the motor?
yes
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

CHEAP, FAST, RELIABLE...PICK 2 CANT HAVE ALL 3
Quote
They are all fukin tasty. My long time favorite, "Dirty Dicks -beerjet-
Quote from: IRRebel on February 16, 2010, 06:11:01 PM
Glasscutter, Skip, OC2  Nordie and many more nail me good every time, relentlessly, I love those guys!

79charger

  • Karma: +0/-0
Re: Fuel Preesure while under load
« Reply #8 on: April 24, 2011, 07:44:06 PM »
Thank you
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
Pages: [1]
 


Null

SMFPacks CMS 1.0.3 © 2026