Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

not starting when hot unless pouring in thimble of fuel in top!

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Kenth:
Are you adjusting the idle mixture screws in gear for best idle/vacuum at 650 rpm´s?
How many turns out from bottomed are the idle mixt. screws?
How much intake vacuum at best idle in gear?

Here are some considerations for your 1980 Chevy 305 carb.

With .069" upper idle air bleeds, .077" lower idle airbleeds and .109" idle air bypass the .032" idle tubes needs to be opened some with todays ethanol-blended fuels. Start with .035".

Also, the main jetting #71 jets and 49P rods is way too lean with the upper and lower .120" main airbleeds. I would use at least #76 jets.

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