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Author Topic:   carb problem

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 04-11-2002 02:44 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
Put in new fuel pump and did 4v conversion on the 302. After new carb finally caught it would not rev, seemed to have flooded condition. Adjusted float level correctly (600 cfm holley 4160). Tried to restart and fuel literally shoot our of the float vent tube. Swapped carbs with another 600 I knew was good. More fuel shooting out of vent tube big time.
The only thing I can think of is that the fuel pump has excessive pressure and is overcoming the inlet needle. Any other thoughts?

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Posts: 18092
From: Lyons, IL, USA
Registered: May 99

posted 04-11-2002 09:51 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Mechanical pump?

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Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 04-11-2002 10:56 AM     Click Here to See the Profile for thedave66   Click Here to Email thedave66     Edit/Delete Message   Reply w/Quote
if it is the pump maybe get a fuel pressure regulator? That may help

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Posts: 256
From: Clinton, CT
Registered: Feb 2002

posted 04-11-2002 12:31 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
Give the float bowls a rap with a screwdriver handle, Holley carbs are notorious for stuck needles/floats. You should be able to adjust the float level no matter what the pressure of the pump, as there is minimal force on the needle. Granted, 45 psi may cause you problems. Get a gauge on that line anyway. Considering the moment arm of the float vs needle, I seriously doubt the pump is pushing the needle open. Try screwing the level down more than you have it now, or get one of those carbs rebuilt. "GOOD" is a very relative term with a Holley, the gaskets dry out at an astonishing rate, and a "good" carb that sits on a shelf dry for a week can suddenly be a "junk" carb. All that is needed is probably a freshen up.

[This message has been edited by Hemikiller (edited 04-11-2002).]

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Posts: 194
From: USA
Registered: Oct 2001

posted 04-11-2002 10:23 PM     Click Here to See the Profile for MidLifCrisis   Click Here to Email MidLifCrisis     Edit/Delete Message   Reply w/Quote
I don't want to state the obvious, but is it the correct fuel pump? If it's a pump for a fuel injected car they run approx 100 psi. A carbuerated pump is only like 8-12 psi or there abouts. I have just done the 4-V conversion on my '67 289. I too had the fuel fountain from the breather tube and just needed to adjusts the floats. It is scary to look at, but easily corrected. I wish you luck, Charlie

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Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 04-12-2002 02:39 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
I replaced the fuel pump with a stock mechanical. Cranked down the float level until there was just a dribble from the sight plug. I'll try cranking down further. Never had this problem from a Holley before that is why I suspected the fuel pump may have been miscalibrated.

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Posts: 1011
From: Athens,GA
Registered: Jul 2001

posted 04-12-2002 12:32 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
A lot of times when you make any changes in the fuel system you get small debris that can end up in the needle and seat. They can also stick, if they set up awhile. If you dont get it working right just put in a new needle and seat and put a inline filter as close to carb as possible and that should take care of it. Make sure to change the oil after it is running OK. Gas can dillute the oil and cause premature engine wear.


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