Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Boiling Gas on shutdown

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2Low8s:
May be unpopular opinion, but I eliminated temp creep at idle in a couple cars/trucks with electric fans. 

Cliff Ruggles:
.060" quench is far from ideal and Pontiac engines with that much quench it them will transmit a lot of heat to the cooling system.  The temps typically "creep" up at idle as well.

Since I learned about this I started getting the quench on all my engines under .040".  Doing this IMMEDIATELY stopped any overheating, running hot, or creeping up idle.  Matter of fact those engines ran very cool and I even had trouble getting heat in them in cool/cold weather.

There are other things that contribute to the cause, like a fan clutch that's not locking up when it needs to, using a stamped steel impeller in the water pump instead of an OEM type cast iron one, advanced or retarded cam timing, etc......

dlphil10:
Understood thank you. Its not a problem worth a rebuild at this point. I'll try a ticker base gasket with plastic inserts to see if that reduces carb temps after shutdown. Thats really the only time there's an issue.

The other variables you mentioned are fine. Cam is degreed per the spec, flowkooler pump with properly clearance divider, so on. I also have issues getting the car up to temp when its 70F or below. Typically it runs at 175F and eventually gets up to 180F.

quadrajam:
The thick gasket is the way to go nowdays with this pee-pee gasoline
that's being refined. Its not like gas in the trans-am and firebird days.
Todays gas is intended to be under pressure and injected into an engine.
It is formulated to boil at much lower temperatures now days. Old school gas boiled at 150*
Now it's lower. Don't blame the ethanol it boils @ 170*.
The refiners have no sympathy for us carburetor guys.
Pluss it has less BTU energy and it's harder for a fuel pump to pull it.

Edelbrock had the same boiling fuel problems with their carbs and came up
with a 3/8 inch base gasket. Cured that problem.

Anyway that's my rant. yall carry on.....

Brian B.:
Phil.....please let us know how you get on with this issue.

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