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Holley 650 Dp Stalling

  • Thread starter Thread starter Demustangs
  • Start date Start date Nov 23, 2017
  • Tags Tags
    89 fox 6psi stalling carb issue
D

Demustangs

Member
Apr 7, 2017
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Nov 23, 2017
#1
  • Nov 23, 2017
  • #1
89 Fox with Holley 650 double pumper supposedly rebuilt from Holley to stock internals is causing a stall on hard brakingand hesitation on hard turns like the bowls are losing fuel but floats are adjusted high as they can go but even all the way up barely will trickle out of the sight plug hole have no clue maybe its defective carb or bowl issue other than that it runs great
 

Gear grabber

Well-Known Member
May 23, 2016
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Nov 23, 2017
#2
  • Nov 23, 2017
  • #2
Symptoms indicate high float level.
What is your fuel pressure ?
 
D

Demustangs

Member
Apr 7, 2017
79
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Nov 24, 2017
#3
  • Nov 24, 2017
  • #3
Gear grabber said:
Symptoms indicate high float level.
What is your fuel pressure ?
Click to expand...

6psi
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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polk county florida
Nov 24, 2017
#4
  • Nov 24, 2017
  • #4
normal things to check, needle valve & seat, sticky floats, fuel line restriction.
 
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CarMichael Angelo

my rearend will smell so minty fresh,
15 Year Member
Nov 29, 1999
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Nov 24, 2017
#5
  • Nov 24, 2017
  • #5
Demustangs said:
89 Fox with Holley 650 double pumper supposedly rebuilt from Holley to stock internals is causing a stall on hard brakingand hesitation on hard turns like the bowls are losing fuel but floats are adjusted high as they can go but even all the way up barely will trickle out of the sight plug hole have no clue maybe its defective carb or bowl issue other than that it runs great
Click to expand...

There's a restriction in the inlet that feeds the needle and seat. Or a defective assy. If you have the floats as high as they will go, gasoline would be pouring out of the bowl vent on top of the carburetor.
 
Reactions: Demustangs and General karthief
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Demustangs

Member
Apr 7, 2017
79
2
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Nov 24, 2017
#6
  • Nov 24, 2017
  • #6
I mean i have adjusted the float high as i could basically and it still won't trickle out normal I have to bump it harder for it to even trickle out

madmike1157 said:
There's a restriction in the inlet that feeds the needle and seat. Or a defective assy. If you have the floats as high as they will go, gasoline would be pouring out of the bowl vent on top of the carburetor.[/QUO
Click to expand...
 

CarMichael Angelo

my rearend will smell so minty fresh,
15 Year Member
Nov 29, 1999
10,641
8,909
234
Birmingham, al
Nov 24, 2017
#7
  • Nov 24, 2017
  • #7
Demustangs said:
I mean i have adjusted the float high as i could basically and it still won't trickle out normal I have to bump it harder for it to even trickle out
Click to expand...
Take the bowl off
 
D

Demustangs

Member
Apr 7, 2017
79
2
8
Nov 24, 2017
#8
  • Nov 24, 2017
  • #8
madmike1157 said:
Take the bowl off
Click to expand...

Then what
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
27,828
10,509
203
polk county florida
Nov 24, 2017
#9
  • Nov 24, 2017
  • #9
Pull the fuel line off and see if you can blow air through the passages.
Where is your fpr at and where is your filter located.
 

CarMichael Angelo

my rearend will smell so minty fresh,
15 Year Member
Nov 29, 1999
10,641
8,909
234
Birmingham, al
Nov 24, 2017
#10
  • Nov 24, 2017
  • #10
Demustangs said:
Then what
Click to expand...
No,..remove the needle and seat assy. Make sure that there's nothing clogging it. Check that your float level is truly correct. Adjusted properly, once the bowl is inverted, the top of the float hangs evenly with the reinforcing ribs around the top two bowl screws.

If this is your first Holley, you should really get one of the many tuning books written out there to deal with one of these carbs. They have been used successfully since the early 70's,..and when they work they work. But if you got something wrong ( and you do,...) they suck.
 
D

Demustangs

Member
Apr 7, 2017
79
2
8
Nov 25, 2017
#11
  • Nov 25, 2017
  • #11
karthief said:
Pull the fuel line off and see if you can blow air through the passages.
Where is your fpr at and where is your filter located.
Click to expand...

I have a 260$ efi to carb dual stage fpr from jegs fender mounted and filter is the stock mou red by the tank
 
D

Demustangs

Member
Apr 7, 2017
79
2
8
Nov 25, 2017
#12
  • Nov 25, 2017
  • #12
madmike1157 said:
No,..remove the needle and seat assy. Make sure that there's nothing clogging it. Check that your float level is truly correct. Adjusted properly, once the bowl is inverted, the top of the float hangs evenly with the reinforcing ribs around the top two bowl screws.

If this is your first Holley, you should really get one of the many tuning books written out there to deal with one of these carbs. They have been used successfully since the early 70's,..and when they work they work. But if you got something wrong ( and you do,...) they suck.
Click to expand...

Good info yea right now it's sucky but I have hope thanks
 
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