HELP!! CARBURATION PROBLEM!!!!Need help ASAP!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71chevylongbed · 03-19-2004, 12:36 AM

i was driving my truck tonight and all of a sudden it starts trying to stall out so i drop it down a gear to get the revs up and after i turned off the main road i look back and it is blowing lots of black smoke out the pipes then i stop and it stalls out and i have a hard time getting it to start again and rev it up to 4000 and it is running really rough so i have to put it in drive at high rpm to keep it from stalling out. what is wrong???
sorry for the long post. i just need to try to get is fixed tonight because i need it to get to school tomorrow and it is my only ride.

FRENCHBLUE72 · 03-19-2004, 12:41 AM

My blazer did that a couple of day's ago when I got arco gas (which I never buy) and as soon as I ran out the old gas and put in new gas it ran normal.. Sound's like you got a rich condition though..

sneakysnake · 03-19-2004, 12:44 AM

black smoke is running to rich, either stuck choke or a stuck float.

71chevylongbed · 03-19-2004, 12:45 AM

every time i fill up i get gas at the same station and at the same pump every time. i filled it up full a few days ago and have already used half the tank so far without any problems until now so i don't think the fuel is the problem.

71chevylongbed · 03-19-2004, 12:46 AM

the choke is open. how do i check for a stuck float?

Maximum Overdrive · 03-19-2004, 01:16 AM

If your float is stuck you can try tapping the carb gently with the handle end of a screwdriver. That can help if a float is stuck.

71chevylongbed · 03-19-2004, 01:50 AM

the problem was a stuck float. i tapped on the carb and the problem went away. what would cause the float to stick in the first place and how can i prevent it from happening again.

phestus · 03-19-2004, 03:21 AM

Likely the cause of the " stuck float" (causing way too much gas) is just one tiny wee speck o' dirt, somewhere in the carb that just loves to get in with the float valve and seat..(causing you way too much aggravation)..
Sooo. to prevent this, as long as you're comfortable with the procedure, is to take apart the carb, and minimum, clean out anywhere where gas is coming into the carb and going into the float chamber..Do yorself a favor and get the kit and rebuild the carb..

Other culprit for dirt is old fuel filters..

And last but not least, a float that don't float no mo'...I've heard of this, but never actually seen it...Pull your float, toss it in a jar of gas..If it floats, it likely works..With old copper hollow floats, I guess some of them could spring a leak, but....

Hope this helps..

Sweet72 · 03-19-2004, 03:24 AM

It may have been just some dirt in the fuel that became lodged between the needle and seat (the float controls this valve) causing it to run rich. To avoid this problem in the future, make sure you have a good fuel filter installed in the feed line either before or after the fuel pump. You may also want to check the condition of your fuel tank and pickup tube/sending unit sock as it may be corroded and sending trash to your carb.

**Palf70Step** · 03-19-2004, 07:34 AM

I'd also check for a vacumn leak. Just went through that on my 82. The vacumn hose to the tranny decided to give out on me.

Gordo · 03-19-2004, 10:56 PM

phestus speaks words of wisdom!

MAC67 · 03-20-2004, 02:28 AM

yup , im runin a 780 holley , her teeth aint big enough to chew up the big chunks hahaha , sounds like you had a chunk suck in the needle n seat , is its a holley you can clean the bowls while its still on the car , just take up the float level screw and pull youre needle and seat , before you do that tho be sure and lark youre float level where they are currently set before you remove them, or dont and just reset the float levels,, any ways hope it helps

71chevylongbed · 03-20-2004, 02:38 AM

it is an edelbrock and i'm running a filter right before the carb. it ran alright today so i probably won't worry about it unless it does it again.

MAC67 · 03-20-2004, 02:44 AM

yeah you probably just passed a chunk of crud , edelbrocks is a pretty trouble free carb , doesnt require near the upkeep a holley does , and holleys are horrible ofr sticking a float

03-19-2004, 12:36 AM	#1
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	HELP!! CARBURATION PROBLEM!!!!Need help ASAP!!! i was driving my truck tonight and all of a sudden it starts trying to stall out so i drop it down a gear to get the revs up and after i turned off the main road i look back and it is blowing lots of black smoke out the pipes then i stop and it stalls out and i have a hard time getting it to start again and rev it up to 4000 and it is running really rough so i have to put it in drive at high rpm to keep it from stalling out. what is wrong??? sorry for the long post. i just need to try to get is fixed tonight because i need it to get to school tomorrow and it is my only ride. __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

03-19-2004, 12:41 AM	#2
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	My blazer did that a couple of day's ago when I got arco gas (which I never buy) and as soon as I ran out the old gas and put in new gas it ran normal.. Sound's like you got a rich condition though.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

03-19-2004, 12:45 AM	#4
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	every time i fill up i get gas at the same station and at the same pump every time. i filled it up full a few days ago and have already used half the tank so far without any problems until now so i don't think the fuel is the problem. __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

03-19-2004, 12:46 AM	#5
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	the choke is open. how do i check for a stuck float? __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

03-19-2004, 01:16 AM	#6
Maximum Overdrive December 21, 2012 Join Date: Apr 2000 Location: Black Eagle, Montana Posts: 1,634	If your float is stuck you can try tapping the carb gently with the handle end of a screwdriver. That can help if a float is stuck. __________________ *"!Ama Sua, Ama Kjella, Ama Lllulla!"*

03-19-2004, 12:44 AM	#3
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	black smoke is running to rich, either stuck choke or a stuck float.

03-19-2004, 01:50 AM	#7
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	the problem was a stuck float. i tapped on the carb and the problem went away. what would cause the float to stick in the first place and how can i prevent it from happening again. __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

03-19-2004, 03:21 AM	#8
phestus Registered User Join Date: Feb 2004 Location: In a snowdrift in Manitoba Posts: 39	Likely the cause of the " stuck float" (causing way too much gas) is just one tiny wee speck o' dirt, somewhere in the carb that just loves to get in with the float valve and seat..(causing you way too much aggravation).. Sooo. to prevent this, as long as you're comfortable with the procedure, is to take apart the carb, and minimum, clean out anywhere where gas is coming into the carb and going into the float chamber..Do yorself a favor and get the kit and rebuild the carb.. Other culprit for dirt is old fuel filters.. And last but not least, a float that don't float no mo'...I've heard of this, but never actually seen it...Pull your float, toss it in a jar of gas..If it floats, it likely works..With old copper hollow floats, I guess some of them could spring a leak, but.... Hope this helps.. __________________ '70 C-10, mostly rust n' dust '74 BMW R90/6 "The quickest way to get yourself out of a hole, is to stop digging..."

03-19-2004, 03:24 AM	#9
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	It may have been just some dirt in the fuel that became lodged between the needle and seat (the float controls this valve) causing it to run rich. To avoid this problem in the future, make sure you have a good fuel filter installed in the feed line either before or after the fuel pump. You may also want to check the condition of your fuel tank and pickup tube/sending unit sock as it may be corroded and sending trash to your carb. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

03-19-2004, 07:34 AM	#10
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,090	I'd also check for a vacumn leak. Just went through that on my 82. The vacumn hose to the tranny decided to give out on me. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-19-2004, 10:56 PM	#11
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	phestus speaks words of wisdom! __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

03-20-2004, 02:28 AM	#12
MAC67 " SHOW ME" Join Date: Jan 2003 Location: shelbyville illinois Posts: 2,624	yup , im runin a 780 holley , her teeth aint big enough to chew up the big chunks hahaha , sounds like you had a chunk suck in the needle n seat , is its a holley you can clean the bowls while its still on the car , just take up the float level screw and pull youre needle and seat , before you do that tho be sure and lark youre float level where they are currently set before you remove them, or dont and just reset the float levels,, any ways hope it helps

03-20-2004, 02:38 AM	#13
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	it is an edelbrock and i'm running a filter right before the carb. it ran alright today so i probably won't worry about it unless it does it again. __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

03-20-2004, 02:44 AM	#14
MAC67 " SHOW ME" Join Date: Jan 2003 Location: shelbyville illinois Posts: 2,624	yeah you probably just passed a chunk of crud , edelbrocks is a pretty trouble free carb , doesnt require near the upkeep a holley does , and holleys are horrible ofr sticking a float



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