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#26 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Choosing a replacement carburetor
Your float is probably shot that's why it's over filling. If it's brass it might have a hole or split seem. Did you adjust the float level when you rebuilt the carb.?
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68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member). |
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#27 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: Choosing a replacement carburetor
I had this company rebuild my carb. It came back like a brand new carb. Its my understanding they sell rebuilt carbs also...
ReCarbCo http://www.recarbco.com/ Oh yes Ride The Snake... ![]() ![]() ![]()
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#28 | |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Quote:
Even if the float is bad and the bowl is overfilled, shouldn't the truck still start? Last edited by Ride The Snake!; 09-19-2012 at 01:11 AM. |
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#29 |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Haha, thank you for the welcoming. Ohio, huh? I'm from Berkeley, CA. Yes, even someone from super-liberal Berzerkeley can appreciate a gas-guzzling classic American V8.
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#30 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: Choosing a replacement carburetor
No it won't start if the bowls overfilled!
It's flooded then. |
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#31 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Choosing a replacement carburetor
Found these 2 carbs on here. The one on the left looks like it would run as is, but I usually rebuild all used carbs I get. If your are going to do a rebuild, just do it on the one you have.
http://67-72chevytrucks.com/vboard/s...d.php?t=541853
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#32 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Choosing a replacement carburetor
It should have attempted to start initially but yes once it floods no. Try holding the pedal to the floor while cranking to keep the throttle plates open and try to clear out some of the gas. If it attempts to fire but chokes out I'd say it's definately your float.
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68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member). |
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#33 |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: Choosing a replacement carburetor
Regarding the harness, it depends on what your goals are. There are alot of simple aftermarket harnesses that would do the trick but if you want plug and play just be patient with the classifieds until you find one. Engine harnesses are usually not found in good shape, so a new replacement/stock version would do the trick and they're not crazy expensive. For the dash harness, lots of nice originals pop up. I just put a used one in my nice driver quality truck and couldn't be happier. Plug and play.
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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#34 |
Registered User
Join Date: Oct 2010
Location: ruston la
Posts: 169
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Re: Choosing a replacement carburetor
A Q jet could be the worst carb ever made. Thats one of the first things I throw out I have a holly double pumper on my 71 its a pretty good carb really easy to tune and rebuild.
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#35 | |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Quote:
I tend to be one of those people who believes stock things are engineered the way they are for a reason. Aftermarket doesn't always mean better. |
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#36 | |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Quote:
The fuel bowl fills up fine, the float doesn't have any leaks. I'm starting to wonder if my jets are clogged, and just enough gas gets through to run it on vapors for a moment. Otherwise, I'm all out of ideas. |
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#37 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: Choosing a replacement carburetor
Maybe you need to re-time your motor.
And figure out how to post some pics. We're workin' in the dark here!! |
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#38 |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Hmm, maybe. I don't know enough about the specifics of bad ignition timing symptoms to say. I know that prior to my carb rebuild, the truck tended to run rich. Months ago the distributor crapped out on me and my roommate rebuilt it, and we dialed in the timing pretty good. I think starting 8 degrees advance and total advance went up to 30-34 degrees or so (the gauge on the crank pulley only goes to +/-12 degrees, so I was estimating the total timing).
I've tried mildly retarding the timing since reinstalling the rebuilt carb, and after no luck put it back where it was, but I couldn't really advance it any farther than it was before because of the way I had the thing oriented. The diaphragm for the vacuum advance is bumping into part of the intake manifold. I guess I should try removing the dizzy shaft and setting it back down where there's more room to adjust the timing. Will timing that is too retarded cause hard starting more than over-advanced timing? I know late timing can make a motor run hot, which mine seemed to do the one time I had it going since this all started. I still wonder if the motor is even getting gas through the jets in sufficient quantity to run, because it starts and then dies, like it's getting just enough fuel vapors to run once for a moment. If the timing is accurate enough for it to start, that shouldn't cause it to die at idle, right? |
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#39 |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Yeah, I don't understand why I can't post pictures. On my forum account there's the option to upload images, which I did. It creates a url on the site where they're stored I guess, and I copied and pasted that url into my post. I was able to open said links, even when logged out of the forum! So weird...
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#40 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: Choosing a replacement carburetor
You could cheat on the trying to advance thing without lifting the distributor. Just move all your cap wires CW one hole. Start at #1 and move it to where #8 is and work back around. Firing order is 18436572 if you don't remember.
The reason it starts and dies could be lack of sufficient choke and a cold intake. It goes lean and dies cause the fuel isn't vaporized. |
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#41 | |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: Choosing a replacement carburetor
Quote:
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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#42 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: Choosing a replacement carburetor
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#43 | |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Quote:
Seems you sent me a PM but my pop-up blocker wouldn't let me see it. Let me try again. |
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#44 | |
Registered User
Join Date: Aug 2011
Location: Oakland, CA
Posts: 99
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Re: Choosing a replacement carburetor
Quote:
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