emergency engine help needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 03-17-2008, 08:05 AM

im on vacation 350 miles from home and my truck is giving me major problems. the first half of the trip went very well. then i noticed that my milage started to suck. when i would come to idle, the truck would barely idle and the exhaust was rich and smelled like raw gas. i pulled over and pulled my carb of (qjet) and disassimbled it. i noticed that there was fuel puddled in the intake. i then bent the float down a little and it made it run better but it still idled rough. i called sean murphy and he said that the fuel pump may have gone out and was putting too much p.s.i. out. im going to change out the pump tomorrow. is there anything else i might be missing.

matthufham · 03-17-2008, 09:13 AM

did a vacuum line come off the tranny or elsewhere?

Cyclone44 · 03-17-2008, 09:18 AM

with matthufham, Also you might want to let us know where you are, Maybe a board member is close and can help you out, I know I would.....

neonlarry · 03-17-2008, 07:13 PM

Is the Q-Jet from Sean? If not the well plugs could be leaking badly and cause this (if Sean built the carb he usually takes care that those won't leak). Just another possibility. Also check the needle valve for dirt holding it open.

**LockDoc** · 03-17-2008, 08:35 PM

Here are the numbers for the emergency contact list in this post by Josh:

http://67-72chevytrucks.com/vboard/s...d.php?t=159313

You might give that a try.

LockDoc

crm318 · 03-17-2008, 10:37 PM

i will check the vacuum line. im in south padre island tx. im about to get the new pump on and i will let yall know.

Eichorst69 · 03-18-2008, 02:37 AM

The float may be bad. They will absorb fuel and sink causing the motor to run rich and flood out.

Rob

72gmcworker · 03-18-2008, 02:49 AM

My guess too would be dirt in needle float valve....had a simular problem and it eventually cleaned itself...ran like crap and would not idle for a while though since it was getting to much fuel.
This happened after a fuel filter change on the carb (Q-jet)

68gmsee · 03-18-2008, 05:33 PM

Quote:

Originally Posted by crm318

i called sean murphy and he said that the fuel pump may have gone out and was putting too much p.s.i. out. im going to change out the pump tomorrow. is there anything else i might be missing.

Must have an electric fuel pump? I've never heard of the problem with too much psi from a mechanical fuel pump.

Anyway, I've had the same problem in the past and it's always been the carb. As mentioned above, I'm with the carb group. I've had to clean the bowl out real good and either replace or clean the needle valve, the seat and also make sure the float is good.

Please let us know what you find.

03-17-2008, 08:05 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	emergency engine help needed im on vacation 350 miles from home and my truck is giving me major problems. the first half of the trip went very well. then i noticed that my milage started to suck. when i would come to idle, the truck would barely idle and the exhaust was rich and smelled like raw gas. i pulled over and pulled my carb of (qjet) and disassimbled it. i noticed that there was fuel puddled in the intake. i then bent the float down a little and it made it run better but it still idled rough. i called sean murphy and he said that the fuel pump may have gone out and was putting too much p.s.i. out. im going to change out the pump tomorrow. is there anything else i might be missing. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

03-17-2008, 09:13 AM	#2
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: emergency engine help needed did a vacuum line come off the tranny or elsewhere?

03-17-2008, 09:18 AM	#3
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: emergency engine help needed with matthufham, Also you might want to let us know where you are, Maybe a board member is close and can help you out, I know I would..... Last edited by Cyclone44; 03-17-2008 at 09:19 AM.

03-17-2008, 07:13 PM	#4
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Re: emergency engine help needed Is the Q-Jet from Sean? If not the well plugs could be leaking badly and cause this (if Sean built the carb he usually takes care that those won't leak). Just another possibility. Also check the needle valve for dirt holding it open. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

03-17-2008, 08:35 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,772	Re: emergency engine help needed Here are the numbers for the emergency contact list in this post by Josh: http://67-72chevytrucks.com/vboard/s...d.php?t=159313 You might give that a try. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 03-17-2008 at 08:37 PM.

03-17-2008, 10:37 PM	#6
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: emergency engine help needed i will check the vacuum line. im in south padre island tx. im about to get the new pump on and i will let yall know. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

03-18-2008, 02:37 AM	#7
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: emergency engine help needed The float may be bad. They will absorb fuel and sink causing the motor to run rich and flood out. Rob

03-18-2008, 02:49 AM	#8
72gmcworker Registered User Join Date: May 2006 Location: North x Northwest BC Posts: 62	Re: emergency engine help needed My guess too would be dirt in needle float valve....had a simular problem and it eventually cleaned itself...ran like crap and would not idle for a while though since it was getting to much fuel. This happened after a fuel filter change on the carb (Q-jet)



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