Holley carb problem

John Beasaw III · 08-16-2011, 05:20 PM

Just rebuilt my holley 750 vacuum carb. The car will only fire with the throttle held part way open. Then will idle for a few seconds and shuts off. Also If i start it and hold it at 1500 rpm, then give it gas it shuts off.

Thought vacuum leak but cant find one.

Any help would be appreciated. Running out of ideas.

Thanks

Duane Eiskant II · 08-17-2011, 08:11 PM

John, almost sounds like you installed the wrong base plate to body gasket. There are several different ones and are all close. If you used the wrong gasket, it will cover and block the wrong passages and wont allow the carb to idle. Also (as im sure you know) dont run the mixture screws in real hard in the metering block it will dimple the screw and cause funky idle issues. My bet tho is the wrong body to base gasket.

John Beasaw III · 08-18-2011, 09:10 AM

Thanks Duane... I'll check that tonight.

Duane Eiskant II · 08-18-2011, 09:38 AM

No problem John, please let me know what you find out.

cad · 08-18-2011, 05:10 PM

That is exactly what I experienced a while back....make sure the gasket matches the base and center section with the 4 oval slots.
If they are covered, the car will start and die immediately, over and over and over....like it is running out of gas instantaneously.

08-16-2011, 05:20 PM	#1
John Beasaw III Member Join Date: Jan 2002 Location: Marion, N.Y. Posts: 126 Likes: 0 Liked 2 Times in 2 Posts	Holley carb problem Just rebuilt my holley 750 vacuum carb. The car will only fire with the throttle held part way open. Then will idle for a few seconds and shuts off. Also If i start it and hold it at 1500 rpm, then give it gas it shuts off. Thought vacuum leak but cant find one. Any help would be appreciated. Running out of ideas. Thanks

08-17-2011, 08:11 PM	#2
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	Re: Holley carb problem John, almost sounds like you installed the wrong base plate to body gasket. There are several different ones and are all close. If you used the wrong gasket, it will cover and block the wrong passages and wont allow the carb to idle. Also (as im sure you know) dont run the mixture screws in real hard in the metering block it will dimple the screw and cause funky idle issues. My bet tho is the wrong body to base gasket. __________________ Duane Eiskant 1354 Stock/Super Stock

08-18-2011, 09:10 AM	#3
John Beasaw III Member Join Date: Jan 2002 Location: Marion, N.Y. Posts: 126 Likes: 0 Liked 2 Times in 2 Posts	Re: Holley carb problem Thanks Duane... I'll check that tonight.

08-18-2011, 09:38 AM	#4
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	Re: Holley carb problem No problem John, please let me know what you find out. __________________ Duane Eiskant 1354 Stock/Super Stock

08-18-2011, 05:10 PM	#5
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 696 Likes: 198 Liked 91 Times in 51 Posts	Re: Holley carb problem That is exactly what I experienced a while back....make sure the gasket matches the base and center section with the 4 oval slots. If they are covered, the car will start and die immediately, over and over and over....like it is running out of gas instantaneously.