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8/24/13 9:05am - Original Message: 'Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
I have a Q Jet on my '72. Last night on my way home it quit on me. Smelled a little rich when I started it but thought nothing of it. It's a vette. Four blocks later it stalled. Never did get it running well enough to drive. Very rich and very rough and wouldn't idle. Black smoke, gas splashing out of the carb, ugly. Towed it home. : (. This morning I rapped on it with butt end of hammer and it starts and idles. A little rough but it idles on its own. It's drivable but I'm scared to take it far. Anyone have advice?

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8/24/13 11:15am - Reply: 'Re: Carb Question'
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
Carburetors are voodoo to me, but if it's never been rebuilt, it's probably due for one.  It needs to go to someone who fully understands Q-jets...not all rebuilders do.  Do not...DO NOT...buy a rebuilt carburetor off-the-shelf from a parts house.  They carry generic models given a cleaning and a new kit but not made for any GM application in particular.  When I was in the auto parts business years back, rebuilt carbs had the highest rate of problems of any product we dealt with...alternators not far behind.

Another good reason to have your carb rebuilt...modern ethanol fuels will deteriorate gaskets and and rubber parts in cars not designed for that fuel.  Modern kits have parts that will eliminate that problem.


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8/24/13 11:45am - Reply: 'Re: Carb Question'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I had my Q-Jet rebuilt in 2008. The outfit I used was recommended to me here at C3VR.
 
The Quad Shop, LLC
5963 Linden Rd.
Rockford, Ill. 61109 - 3513
Tel. (815) 874-4884
 
Excellent rebuild! It has performed very well for the last five + years. I'd use them again if the need arises.
Feels like a few added horsepower it runs so well.
 
I've heard a few horror stories of poorly rebuilt Q-Jets. No fun. It's definitely worth it to use a quality, ruputable rebuilder for these carbs.
 
Let us know how you make out with yours.
 
Kevin


|UPDATED|8/24/2013 9:45:42 AM (AZT)|/UPDATED|


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8/24/13 1:28pm - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Forgot to mention it was rebuilt two months ago locally. I topped off the tank yesterday with Stinker gas. 10% ethanol. Today I took it out and drove it for over an hour. Started in neighborhood and it was a little rough. Then some 50 mph runs. Then to a pure gas station. I burned about 5 gal yesterday trying to get it going. WOW! Then some 70mph on the freeway. Runs like a champ. Crap in the gas or something more serious? Towing is no fun!

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8/24/13 1:50pm - Reply: 'Re: Carb Question'
apasbigal
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goldens bridge, NY - USA

Vette(s):
1972 T-Top 350 auto, matching numbers,Blue, ac

Joined: 11/3/2003
Posts: 498
I alway start simple. Fuel Filter ? Water and crap in the gas? Big Al

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8/24/13 2:23pm - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
I'm most concerned now about the white smoke out of right tailpipe last night. Only happened under heavy revving. Today one small black puff out of left upon start. Nothing out of right. This may remain a mystery since all seems normal unless that white smoke deal comes back. Maybe there was water in the system we had heavy t storms two days ago. Hmmm...

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8/24/13 2:26pm - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
KDADDY79 said: I had my Q-Jet rebuilt in 2008. The outfit I used was recommended to me here at C3VR.
 
The Quad Shop, LLC
5963 Linden Rd.
Rockford, Ill. 61109 - 3513
Tel. (815) 874-4884
 
Excellent rebuild! It has performed very well for the last five + years. I'd use them again if the need arises.
Feels like a few added horsepower it runs so well.
 
I've heard a few horror stories of poorly rebuilt Q-Jets. No fun. It's definitely worth it to use a quality, ruputable rebuilder for these carbs.
 
Let us know how you make out with yours.
 
Kevin






For future ref, is this outfit spendy? I dropped $250 on my rebuild.

|UPDATED|8/24/2013 12:26:48 PM (AZT)|/UPDATED|


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8/24/13 9:39pm - Reply: 'Re: Carb Question'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I think it cost around $350.00
Worth every penny!
 
Some poor rebuilds can start a whole dominoe effect. Ouch
 
From what I've read and heard, you just gotta get it rebuilt right from someone who appreciates and knows Q-Jets.
 
I hope you find a simpler solution to your current troubles, though.
 
Kevin  
 


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8/25/13 8:26am - Reply: 'Re: Carb Question'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Be vewy vewy careful with white smoke out of a tailpipe. Tell tale signs of a head gasket letting go. I would stay out of the high rpm range, keep a very close eye on coolant levels and temperature. If the white smoke increases, time to get to a garage...Confused

As for the carb, very well could be bad gas. Keep her on a good diet (I use Sunoco premium only) and in the interim, throw in a bottle of fuel treatment.

Good luck,

Paul


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8/25/13 1:50pm - Reply: 'Re: Carb Question'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Sounds to me like you had float stick open and allow gas to overflow everything....check it out and contact the rebuilder.

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8/26/13 5:34pm - Reply: 'Re: Carb Question'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3934
Kinda have to agree with Danascar, sounds a bit like a float problem, if you had gas running out the top.  Been there done that... it had one of the solid plasticky foam type floats, and it was more or less sinking in the gas...  but that was a loong time ago when that happened... :)
 
As for the smoke... well....  not so sure there... hopefully you didn't wash out a cylinder.... as stated before(and i'm sure you know... just keep an eye on it... :) )


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StingrayJim
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8/27/13 9:32am - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Update:
 
All seems to be okay now. The car starts, runs, and sounds good. My mechanic (he's been working on vettes for 40 years) said to change the fuel filter and watch it. Another mechanic friend said to run seafoam through it. No harm there. He also thinks the white smoke could have been just way WAY too much gas going through the system. I burned something like 4 gallons going through this ordeal so he could be right. I just don't know. I'm still a little nervous about it but my old-timer mechanic wasn't too concerned so I guess I shouldn't be either.
 
However, when the engine was rebuilt 5,000 miles back the compression was raised to 9.5:1 so I don't know if this could be the beginning of a problem. I'm half tempted to replace the head gasket on the right side during the off-season. What do you all think?
 
When swapping out the filter I found that there were, in fact, TWO filters. One in the carb and the other in-line. Bubba had positioned the in-line filter right next to the right head. In fact, it was actually touching the head. And, the fuel line was laying on the after-market valve cover and that valve cover had a pretty sharp edge on it. So... the fuel line was dangerously close to springing a leak. I believe a fuel filter touching the head could cause the fuel in that metal filter to boil. Thus, when I try to start I have some problems. May explain hard starting after running the car for a while.


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8/27/13 11:42am - Reply: 'Re: Carb Question'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
I've been thinking of putting an inline fuel filter on my car.  I'd like to put it just upstream of the gas tank in the rubber hose back there.  Do I need to look for a "suck through" filter vs a "pull through"?  Or does it matter. 

I also want to replace my bronze fuel filters on my Holley carb with paper filters that won't transfer heat from the fuel lines.  Not sure where to find these either.  I have hard lines from the pump all the way to the carb.


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8/27/13 1:05pm - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Wow... your car is a lot like mine except you have an LT1. I just have a hopped up 350. Anyway, the filter I got is mostly glass. It's easy to change the elements because the body of the filter does not change, just the element. I got it at O'Reilly. It's much smaller in diameter and now it clears any hot parts by about an inch. Makes me feel much better.
 
I have a rubber hose from the pump to about 10 inches from the carb. I wonder if Bubba cut the metal tube to install the second filter. I bet he did. Confused
 
Good luck on yours.


|UPDATED|8/27/2013 11:05:36 AM (AZT)|/UPDATED|


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8/27/13 3:51pm - Reply: 'Re: Carb Question'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
Over on the other forum, a guy said he had a glass filter and he got a bunch of replies saying get rid of the glass filter cause it can break and spill gas all over a hot engine.  Said to replace it with a metal bodied filter.

I want to put one in the rubber line back by the tank.  Then I can get rid of the "stone" filters in the carb.


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8/28/13 1:09pm - Reply: 'Re: Carb Question'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
F4Gary said: Over on the other forum, a guy said he had a glass filter and he got a bunch of replies saying get rid of the glass filter cause it can break and spill gas all over a hot engine.  Said to replace it with a metal bodied filter.

I want to put one in the rubber line back by the tank.  Then I can get rid of the "stone" filters in the carb.


Thanks for the heads up. I would have NEVER thought the filter would be in danger of breaking. Why would someone even build something like that?

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8/28/13 9:40pm - Reply: 'Re: Carb Question'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
I've used the see-thru filters on several vehicles with no problem. Had one on the Sneezle Mercedes for years, and have one on my Goldwing now. If they are not allowed to bang up against anything, OR if they are not tightened too tight when screwing the ends on, I don't see how they would break. The one on the Goldwing pretty much just lays on top of the engine case with no problems.
All that being said, a regular metal filter is definitely safer in the long run, but the see-thrus with replaceable elements are fine. Big smile

As far as the bronze in-carb filters, I prefer those to the paper ones....the bronze ones can be cleaned/reused. I can't see being a bronze material would really pass any more heat to the fuel than the metal fuel lines, or the carb bowls....unless I'm missing something there.
Installing a filter back by the tank is iffy, in most cases, with a mechanical fuel pump. The best thing for that is to use as small of one as possible....the less volume the pump has to suck the fuel thru the better. A filter with a large canister can work the pump a little more than normal to get the fuel started thru it, since the filter will always have a small amount of air in it. Thumbs Up


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