truck wont idle, carb leaking fuel - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DanoDMano · 02-21-2004, 12:57 PM

My truck wont idle on its own, and the carburator is leaking fuel out the back thru the tube in my drawing. It sounds like the truck is missing.
I had this happen once before, but I figured I just flooded it, and in the morning it fired right up. This time it didnt work.

I have a newer Holley 600CFM, w/ electric choke....

Please excuse the crude drawing.

HELP!!!:p

Chevy67Tk · 02-21-2004, 01:10 PM

Possible Float valve is leaking or stuck open.

DanoDMano · 02-21-2004, 01:17 PM

Where is that located?? Is it easy to remove and inspect?

Thanks.

Holley Drawing Link

gr8scott51 · 02-21-2004, 01:28 PM

The floats sometimes develop a leak, allowing gas to get inside the float so it doesn't float. When the float doesn't float, it allows the fuel to continue entering the carb bowl. Got it? If it's like most carbs, you have to pull the top off the carb to access the float. You'll want to replace the gasket when you're done. A rebuild kit normally includes everything you'll need. Jewels pulled her 2 barrel off ot rebuild it, I've done a couple on the engine (if the carb to intake gasket doesn't need to be replaced).

good luck, scott

DanoDMano · 02-21-2004, 01:30 PM

Its not leaking out of the carb bowl. Its coming out of the tube at the rear of the carburator???

Zeke · 02-21-2004, 01:35 PM

Secondary float needle and seat are dirty or float sticking. Mine would flood out when I stopped and got progressively worse. Take the bowl off clean the needle and seat and get a good fuel filter. Mine had fine rust on it.

gr8scott51 · 02-21-2004, 01:38 PM

I think that tube is the bowl vent, made just for this reason.

good luck, scott

DanoDMano · 02-21-2004, 01:45 PM

Thanks alot Guy's!! Man I'll never get over how cool this board has been. That sounds exactly like the problem with my truck.

I am going to tear into it this morning.

gr8scott51 · 02-21-2004, 01:49 PM

If I hadn't already promised to hepl rebuild my daughter's boyfriend's brakes, I'd come help.

good luck, scott

DanoDMano · 02-21-2004, 02:41 PM

Thanks Scott!! Its always a learning experience with my truck, but I sure enjoy working on it!!

Thanks for all the help!!!

jose · 02-21-2004, 02:55 PM

DanoDMano you might want to check the spark plugs also . To much fuel going down the intake will foul them . You might also check out the oil dip stick and see if there is a smell of gas if there is you will have to change your oil . Jose

chevymaz · 02-21-2004, 03:38 PM

mine was doing the same thing. I changed the Power valve and it took care of the problem. I have heard Holley's are notorious for blowing these

Greg

68 Suburban · 02-21-2004, 03:57 PM

Quote:

Originally posted by chevymaz
mine was doing the same thing. I changed the Power valve and it took care of the problem. I have heard Holley's are notorious for blowing these

Greg

I know some people swear by them, but it seems like all I ever did was swear at them. Every Holley I ever had, developed a flooding problem at one time or another. I have not used a holley in 15 years.

DanoDMano · 02-21-2004, 08:14 PM

Yup, it was the secondary float!!! I disassembled it and cleaned it up. Works fine now!!!

I found a real cool website in the process too!!

Hotrod Info

Thanks as usual!!

gr8scott51 · 02-23-2004, 04:08 PM

Hey Dano, we're so as dumb as we look!!

02-21-2004, 12:57 PM	#1
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	truck wont idle, carb leaking fuel My truck wont idle on its own, and the carburator is leaking fuel out the back thru the tube in my drawing. It sounds like the truck is missing. I had this happen once before, but I figured I just flooded it, and in the morning it fired right up. This time it didnt work. I have a newer Holley 600CFM, w/ electric choke.... Please excuse the crude drawing. HELP!!!:p Attached Images __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

02-21-2004, 01:10 PM	#2
Chevy67Tk Registered User Join Date: Mar 2003 Location: PA Posts: 349	Possible Float valve is leaking or stuck open. __________________

02-21-2004, 01:17 PM	#3
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Where is that located?? Is it easy to remove and inspect? Thanks.Holley Drawing Link __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos Last edited by DanoDMano; 02-21-2004 at 01:23 PM.

02-21-2004, 01:28 PM	#4
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	The floats sometimes develop a leak, allowing gas to get inside the float so it doesn't float. When the float doesn't float, it allows the fuel to continue entering the carb bowl. Got it? If it's like most carbs, you have to pull the top off the carb to access the float. You'll want to replace the gasket when you're done. A rebuild kit normally includes everything you'll need. Jewels pulled her 2 barrel off ot rebuild it, I've done a couple on the engine (if the carb to intake gasket doesn't need to be replaced). good luck, scott __________________ Silence is golden, duct tape is silver. - Scott

02-21-2004, 01:30 PM	#5
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Its not leaking out of the carb bowl. Its coming out of the tube at the rear of the carburator??? __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

02-21-2004, 01:35 PM	#6
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Secondary float needle and seat are dirty or float sticking. Mine would flood out when I stopped and got progressively worse. Take the bowl off clean the needle and seat and get a good fuel filter. Mine had fine rust on it. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

02-21-2004, 01:38 PM	#7
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	I think that tube is the bowl vent, made just for this reason. good luck, scott __________________ Silence is golden, duct tape is silver. - Scott

02-21-2004, 01:45 PM	#8
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Thanks alot Guy's!! Man I'll never get over how cool this board has been. That sounds exactly like the problem with my truck. I am going to tear into it this morning. __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

02-21-2004, 01:49 PM	#9
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	If I hadn't already promised to hepl rebuild my daughter's boyfriend's brakes, I'd come help. good luck, scott __________________ Silence is golden, duct tape is silver. - Scott

02-21-2004, 02:41 PM	#10
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Thanks Scott!! Its always a learning experience with my truck, but I sure enjoy working on it!! Thanks for all the help!!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

02-21-2004, 02:55 PM	#11
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	DanoDMano you might want to check the spark plugs also . To much fuel going down the intake will foul them . You might also check out the oil dip stick and see if there is a smell of gas if there is you will have to change your oil . Jose __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

02-21-2004, 03:38 PM	#12
chevymaz What are you looking at? Join Date: Jul 2003 Location: Kellyville,Oklahoma Posts: 308	mine was doing the same thing. I changed the Power valve and it took care of the problem. I have heard Holley's are notorious for blowing these Greg __________________ 1971 GMC LWB 2005 Honda Element 2007 Honda Fit

02-21-2004, 08:14 PM	#14
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Yup, it was the secondary float!!! I disassembled it and cleaned it up. Works fine now!!! I found a real cool website in the process too!! Hotrod Info Thanks as usual!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

02-23-2004, 04:08 PM	#15
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	not so dumb Hey Dano, we're so as dumb as we look!! __________________ Silence is golden, duct tape is silver. - Scott



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