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03-16-2011, 08:05 PM
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CC Member
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Join Date: Feb 2001
Location: BRADENTON,
FL
Cobra Make, Engine: KIRKHAM 427 S/C, SHELBY 427 ALUM. STROKER
Posts: 1,396
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Not Ranked
Holley 4160 (marine) too rich
I have 2 351W's with holley carbs in my boat. One runs fine, the other won't idle (dies). While running at a hi idle, fuel is dripping/spraying out of the main disgharge nozzels, and drips out at low idle, and dies. Looks like too hi float level or pump pressure or power valve leaking . Had carb apart twice today. First time everything looked ok, all passages open, float level ok. Reinstalled, no improvement. 2nd time I replaced power valve and needle & seat. Still no joy. Vac 13-15" at 700-1000 rpm, fuel pump pressure 8psi.
Any ideas? 
__________________
"When Injustice becomes Law,
Rebellion becomes Duty." T. Jefferson
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03-16-2011, 08:29 PM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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Not Ranked
lower fuel pressure to 3-5 lbs
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03-16-2011, 08:35 PM
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Senior Club Cobra Member
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Join Date: Nov 2003
Location: Parker County,
Tx
Cobra Make, Engine: LoneStar LS427 , 427 Windsor
Posts: 381
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Not Ranked
Take the float out, shake it, and listen for liquid in it.
__________________
Jim
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A Gnat! Quick, get a sledgehammer!
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03-16-2011, 08:39 PM
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CC Member
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Join Date: Feb 2001
Location: BRADENTON,
FL
Cobra Make, Engine: KIRKHAM 427 S/C, SHELBY 427 ALUM. STROKER
Posts: 1,396
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Not Ranked
Jerry: thanks for the info. I couldn't remember the proper setting. 8 psi did seem too hi !
Jim: no problem there, solid floats !
__________________
"When Injustice becomes Law,
Rebellion becomes Duty." T. Jefferson
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03-17-2011, 04:42 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Quote:
Originally Posted by MOTORHEAD
Jerry: thanks for the info. I couldn't remember the proper setting. 8 psi did seem too hi !
Jim: no problem there, solid floats !
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Solid floats doesn't mean they won't absorb fuel, which all nitrophyl floats eventually do.
They have to weigh below a maximum weight as specified by the carb manufacturer.
__________________
Gary
Gold Certified Holden Technician
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03-19-2011, 10:31 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
I would think that there is too much fuel pressure.
.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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03-19-2011, 11:46 AM
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CC Member
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Join Date: Feb 2001
Location: BRADENTON,
FL
Cobra Make, Engine: KIRKHAM 427 S/C, SHELBY 427 ALUM. STROKER
Posts: 1,396
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Not Ranked
Yeah, I installed a regulator & set it to 5psi. That solved the problem.
__________________
"When Injustice becomes Law,
Rebellion becomes Duty." T. Jefferson
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