Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Carb Loading Up? (Cliff Built Q-Jet)

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grivera:

--- Quote from: Cliff Ruggles on August 19, 2013, 04:31:01 AM ---How many years has it been since we rebuilt the carburetor?

I'd replace the float, needle/seat assembly, accl pump and new top gasket.  Might want to check the bottom plugs as well, to make sure they aren't leaking.

We've got a few units back that have been out there quite a while with leaking bottom plugs.  This new fuel is pretty hard on the castings, at least it finds it's way past the bottom plugs easier than the older stuff.....Cliff

--- End quote ---

You sent it to me in '06, but it's only been in service since '09. Where are the bottom plugs located and how do I test/fix them? Any pictures on this site for reference? I know I can check your book, but it's on loan to my brother in NJ so I can't look at it for a few days.

I have a hard line to the carb from the pump and don't know how to check the fuel pressure with this configuration?

Is the AC Delco pump the basic replacement pump (#40679) as seen below?
http://www.amazon.com/gp/product/B000C9KT28/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

grivera:
By the way, the carb has about 1500 miles on it since 2009.

Ethan1:

--- Quote from: von on August 19, 2013, 03:13:02 AM ---I've had two new Airtex pumps on my stock 350 Chevy and they both put out 8-9 psi at idle measured at the carb.  My carb was flooding after the engine was shut off. I installed an AC Delco pump with 5 psi and problem fixed.

--- End quote ---

 Same here, Von. The Airtex I had ran it too high for the Qjet I had on my 406.

grivera:

--- Quote from: grivera on August 19, 2013, 05:47:47 AM ---


You sent it to me in '06, but it's only been in service since '09. Where are the bottom plugs located and how do I test/fix them?


--- End quote ---

Cliff, It probably has 1500 miles on it since. Are the bottom plugs still a possible source of the leak?

Frank400:
Are you running with the original fuel return line ?  I've noticed it makes a huge difference in some cases.

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