Black Exhaust after long rest - The 1947 - Present Chevrolet & GMC Truck Message Board Network

custom10nut · 01-11-2018, 09:58 AM

Either it Dried fuel or Seperated Fuel. The 10% Ethanol fuel Seperates after about 30 days, and will gum up you "old style fuel delivery system". Put about a half tank of clean gas with a can of Sea Foam, and run it. It'll run like crap for a little bit but, it'll clean everything out. If that doesn't work, you're looking at a carb rebuild to fix your issue

71rehab · 01-23-2018, 11:31 AM

Quote:

Originally Posted by custom10nut

Either it Dried fuel or Seperated Fuel. The 10% Ethanol fuel Seperates after about 30 days, and will gum up you "old style fuel delivery system". Put about a half tank of clean gas with a can of Sea Foam, and run it. It'll run like crap for a little bit but, it'll clean everything out. If that doesn't work, you're looking at a carb rebuild to fix your issue

Same issue. Will fire with a big puff of black exhaust and will not stay running unless I manually hold the choke open. When warm, idles nicely.

Carb rebuild time? I see QJet rebuild kits all over the place. Is one better than another? Brass or rubber float?

**Ironangel** · 01-23-2018, 11:51 AM

I get my rebuild kits here, https://cliffshighperformance.com/ and here, https://quadrajetparts.com/ As far as the floats go, the new Quadrajet Nitrophyl Carburetor Float Part # [1402] will withstand the riggers of moonshine. (alcohol)

geezer#99 · 01-23-2018, 11:56 AM

Quote:

Originally Posted by 71rehab

Same issue. Will fire with a big puff of black exhaust and will not stay running unless I manually hold the choke open. When warm, idles nicely.

Carb rebuild time? I see QJet rebuild kits all over the place. Is one better than another? Brass or rubber float?

Sounds like your choke pull off pot is kaput or the linkage is wacko.
Easier to replace the pot.
Easy to check the pot too. Draw a little vacuum on it, it should pull in the arm.

71rehab · 01-23-2018, 12:21 PM

Quote:

Originally Posted by geezer#99

Draw a little vacuum on it, it should pull in the arm.

Thanks for this. I like the idea of easier. But could you explain how to test this like you were explaining it to a 4-year-old? My carb knowledge is very shallow.

01-11-2018, 09:58 AM	#1
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,857	Re: Black Exhaust after long rest Either it Dried fuel or Seperated Fuel. The 10% Ethanol fuel Seperates after about 30 days, and will gum up you "old style fuel delivery system". Put about a half tank of clean gas with a can of Sea Foam, and run it. It'll run like crap for a little bit but, it'll clean everything out. If that doesn't work, you're looking at a carb rebuild to fix your issue

01-23-2018, 11:51 AM	#3
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Black Exhaust after long rest I get my rebuild kits here, https://cliffshighperformance.com/ and here, https://quadrajetparts.com/ As far as the floats go, the new Quadrajet Nitrophyl Carburetor Float Part # [1402] will withstand the riggers of moonshine. (alcohol) __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"



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