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Author Topic:   annular discharge boosters dripping fuel at idle
popeye
Gearhead

Posts: 252
From: Dixon, IA USA
Registered: Dec 2002

posted 04-30-2003 09:09 AM     Click Here to See the Profile for popeye   Click Here to Email popeye     Edit/Delete Message   Reply w/Quote
I have A 750 cfm 4 barrel double pumper list # 9379 that drips fuel from the back boosters at idle and gets worse when the idle speed is increased. Adjusting the rear float seems to do nothing.The carb is an old race carb used on a 2200# street car with a 428 ci with a streetable solid cam but dont know the specs.I am going to rebuild the carb this week and would like some feedback as to what to look for.BTW its comes with a 8.5 pv according to the Holley illustrated parts & specs manual.thanks popeye

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This is FORD COUNTRY, where on a quiet night, you can here a chevy rusting

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Buster
Gearhead

Posts: 1553
From: Hurricane alley
Registered: May 2002

posted 04-30-2003 09:59 AM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
Blocked air bleed or if it has 4 corner idling system the rear setting could be to lean.

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popeye
Gearhead

Posts: 252
From: Dixon, IA USA
Registered: Dec 2002

posted 04-30-2003 10:35 PM     Click Here to See the Profile for popeye   Click Here to Email popeye     Edit/Delete Message   Reply w/Quote
Buster,if what you discribed as the cause of the problem then a rebuild should do the trick.thanks popeye

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This is FORD COUNTRY, where on a quiet night, you can here a chevy rusting

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Buster
Gearhead

Posts: 1553
From: Hurricane alley
Registered: May 2002

posted 05-01-2003 01:02 AM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
Well, before I would go that far and rebuild the thing, I would use compressed air and blow out all 4 air bleeds and then adjust the idle circuits.

What I like to do is remove the idle screws and then blow out the air bleeds... give the dirt somewhere to exit. Also blow some air in the idle circuits as well.

Be careful not to put too much pressure in the circuits... be easy on the power valve.

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Buster
Gearhead

Posts: 1553
From: Hurricane alley
Registered: May 2002

posted 05-05-2003 04:53 PM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
popeye, any luck?

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popeye
Gearhead

Posts: 252
From: Dixon, IA USA
Registered: Dec 2002

posted 05-07-2003 01:05 AM     Click Here to See the Profile for popeye   Click Here to Email popeye     Edit/Delete Message   Reply w/Quote
Buster I got looking at this carb a little closer and decided to hold for now.The carb belongs to a friend of mine.He decided to buy a new holley 750 hp double pumper for his Cobra replica and is not sure what he's going to do with the old carb yet.Do you think the rear metering block would be a good replacement for a 750 dp with the drop leg boosters(Proform main body).It has the adjustable air/fuel mixture screws?

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This is FORD COUNTRY, where on a quiet night, you can here a chevy rusting

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gregaust
Journeyman

Posts: 26
From: australia
Registered: Jul 2002

posted 05-11-2003 07:08 AM     Click Here to See the Profile for gregaust     Edit/Delete Message   Reply w/Quote
If the carb is old,remove the rear needle and seat and check the the needle looks ok..Fit a new o'ring to the n+s since if it is old and has shrunk,fuel bypasses ,hence adjusting the n+s does nothing..Worth a try..

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