General Category > Quadrajet Carb Talk and Tips

Quadrajet Evaporation

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77cruiser:
Seems to have just give it a pump  to set the choke & fires right up.

markedmondson:
After sitting a week or less, my Q-Jet car needs to crank before firing.  After he rebuilt it, Cliff assured me the fuel bowl has no leaks.

We have E10 in North Texas.  I understand the rate of evaporation depends on several things, including the amount of ethanol, temperature, barometric pressure, design of bowl vents, car's susceptibility to heat soak.

I consider the cranking routine as part of the charm of owning an old analog car.  Consider it an opportunity to prime the engine before it starts.  :D

Cliff Ruggles:
Even if the carb bowl goes dry the fuel pump should re-fill it quickly.  Having to crank for more than a few seconds and maybe one or two cycles may indicate that the fuel is draining back to the tank and the lines feeding the pump are dry.

Fuel has always evaporated in a vented system and vented carburetor, nothing much can be done about that, but it should not drain all the way back to the tank and have to be re-primed every time you let it sit a few days and need to re-start the vehicle....Cliff

markedmondson:
Good points Cliff.

By priming the engine, I meant building some oil pressure while cranking before it fires. A tongue-in-cheek benefit.

In my case, after a week or so, the starter will crank 4-5 seconds before the engine fires.

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