holley carb prob(pics) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BamaDave · 01-20-2011, 08:38 PM

what part is it that is leaking in the picture? this is at the bottom right front of the carb. also why is there all the discoloration around the front?

fattyarbuckle · 01-20-2011, 08:46 PM

accelerator pump
^^SP

I'd say fix the leaks and clean it and the coloring should stop.

BamaDave · 01-20-2011, 09:03 PM

when my truck is idleing, you can smell fuel, so it is running really rich. The idle rpm is @1000, any less and the thing wants to die. what kind of adjustment should I try?

fattyarbuckle · 01-20-2011, 09:08 PM

fix all the leaks first and then look for vacuum leaks...it should idle down more than that.

mooseknuckles · 01-20-2011, 09:20 PM

looks like the gaskets on the metering block and the accelerator pump are leaking!

BamaDave · 01-20-2011, 09:23 PM

Where would b the best place to pick up parts?
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cableguy0 · 01-20-2011, 09:44 PM

You need a rebuild kit. That carb is leaking from everywhere. Thats whats causing the discoloration. Generally a super rich and rough idle in a holley is a blown power valve. The power valve will come in the rebuild kit.

benoit454 · 01-20-2011, 10:19 PM

summit, jegs, advanceauto or autozone all have rebuild kits. I would 2nd the rebuild front could be the bowl or metering block/plate, side is the accelerator pump, could be the base to the body gasket also.

Idle speed should be around 800rpms in park warmed up to temp. and about 600 rpm in gear.

66skylarkpost · 01-20-2011, 10:26 PM

you could just give all the screws a turn , how old is the carb ?

BamaDave · 01-20-2011, 10:40 PM

about 10 to 12 yr. old

allengator · 01-20-2011, 10:40 PM

Quote:

Originally Posted by 66skylarkpost

you could just give all the screws a turn , how old is the carb ?

Adjusting a leaking carb won't help... If gas can leak out, air can leak in under vacuum...
+1 on the rebuild kit!
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66skylarkpost · 01-20-2011, 10:46 PM

Quote:

Originally Posted by BamaDave

about 10 to 12 yr. old

i know the newer plastic bowl screw gaskets always could use a tightening once in a while . yet since its that old and hasnt been gone thru , i'd overhaul it .

allengator · 01-20-2011, 10:49 PM

My bad... I was thinking you meant adjusting screws!!
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BamaDave · 01-20-2011, 11:27 PM

I've never rebuilt a carb before but I am willing to try. Or should I not even attempt this. I'm somewhat mechanically inclined. How much does a kit cost and should I get any extra jets, pump cams, etc.? Also, what causes the powervalve to pop?

66skylarkpost · 01-20-2011, 11:35 PM

dont be intimidated . holleys are simple , a simple rebuild is easy . it looks to be a 600 vacumn secondary , it keep it stock . a power valve will come the kit and holleys in the last 15 years have a anti blow-put orifice in the base plate and rare blow one , all it is a small diaphram . a rebukld kit for that will run around $30 , have a couple cans of carb cleaner and patience . the kit wil come with instructions, an exploded view and a float gauge . if you need help, you can find it on this board .

cableguy0 · 01-20-2011, 11:40 PM

Power valves can wear out due to age and crack. They will also blow or pop from a backfire through the carb. Theres no need to change any jets or pump cams etc. Just leave it be and install the rebuild kit.

01-20-2011, 08:38 PM	#1
BamaDave Registered User Join Date: May 2010 Location: Shoals, AL Posts: 299	holley carb prob(pics) what part is it that is leaking in the picture? this is at the bottom right front of the carb. also why is there all the discoloration around the front? Attached Images

01-20-2011, 08:46 PM	#2
fattyarbuckle Registered User Join Date: Nov 2010 Location: St. Louis Mo. Posts: 282	Re: holley carb prob(pics) accelerator pump ^^SP I'd say fix the leaks and clean it and the coloring should stop. Last edited by fattyarbuckle; 01-20-2011 at 08:47 PM.

01-20-2011, 09:03 PM	#3
BamaDave Registered User Join Date: May 2010 Location: Shoals, AL Posts: 299	Re: holley carb prob(pics) when my truck is idleing, you can smell fuel, so it is running really rich. The idle rpm is @1000, any less and the thing wants to die. what kind of adjustment should I try?

01-20-2011, 09:08 PM	#4
fattyarbuckle Registered User Join Date: Nov 2010 Location: St. Louis Mo. Posts: 282	Re: holley carb prob(pics) fix all the leaks first and then look for vacuum leaks...it should idle down more than that.

01-20-2011, 09:20 PM	#5
mooseknuckles Registered User Join Date: Sep 2009 Location: ottawa,canada Posts: 4,550	Re: holley carb prob(pics) looks like the gaskets on the metering block and the accelerator pump are leaking! __________________ my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682

01-20-2011, 09:23 PM	#6
BamaDave Registered User Join Date: May 2010 Location: Shoals, AL Posts: 299	Re: holley carb prob(pics) Where would b the best place to pick up parts? Posted via Mobile Device

01-20-2011, 09:44 PM	#7
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: holley carb prob(pics) You need a rebuild kit. That carb is leaking from everywhere. Thats whats causing the discoloration. Generally a super rich and rough idle in a holley is a blown power valve. The power valve will come in the rebuild kit. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

01-20-2011, 10:19 PM	#8
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: holley carb prob(pics) summit, jegs, advanceauto or autozone all have rebuild kits. I would 2nd the rebuild front could be the bowl or metering block/plate, side is the accelerator pump, could be the base to the body gasket also. Idle speed should be around 800rpms in park warmed up to temp. and about 600 rpm in gear. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

01-20-2011, 10:26 PM	#9
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: holley carb prob(pics) you could just give all the screws a turn , how old is the carb ? __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car

01-20-2011, 10:40 PM	#10
BamaDave Registered User Join Date: May 2010 Location: Shoals, AL Posts: 299	Re: holley carb prob(pics) about 10 to 12 yr. old

01-20-2011, 10:49 PM	#13
allengator Registered User Join Date: Dec 2010 Location: Burleson, Texas Posts: 596	Re: holley carb prob(pics) My bad... I was thinking you meant adjusting screws!! Posted via Mobile Device __________________ Allengator Outta the Blue (my band - available for hire in the DFW area!) 1980 Chevy SWB Pickup (build thread) 1951 Chevy Sedan Delivery 2004 Chevy Tahoe Z71 2011 Harley Davidson Street Glide 2018 Silverado Z71 Crew Cab

01-20-2011, 11:27 PM	#14
BamaDave Registered User Join Date: May 2010 Location: Shoals, AL Posts: 299	Re: holley carb prob(pics) I've never rebuilt a carb before but I am willing to try. Or should I not even attempt this. I'm somewhat mechanically inclined. How much does a kit cost and should I get any extra jets, pump cams, etc.? Also, what causes the powervalve to pop? Last edited by BamaDave; 01-20-2011 at 11:28 PM.

01-20-2011, 11:35 PM	#15
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: holley carb prob(pics) dont be intimidated . holleys are simple , a simple rebuild is easy . it looks to be a 600 vacumn secondary , it keep it stock . a power valve will come the kit and holleys in the last 15 years have a anti blow-put orifice in the base plate and rare blow one , all it is a small diaphram . a rebukld kit for that will run around $30 , have a couple cans of carb cleaner and patience . the kit wil come with instructions, an exploded view and a float gauge . if you need help, you can find it on this board . __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car Last edited by 66skylarkpost; 01-20-2011 at 11:39 PM.

01-20-2011, 11:40 PM	#16
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: holley carb prob(pics) Power valves can wear out due to age and crack. They will also blow or pop from a backfire through the carb. Theres no need to change any jets or pump cams etc. Just leave it be and install the rebuild kit. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

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