Re: Car won't start without priming carb

Posted by PackardV8 On 2016/10/10 21:16:02

The gas is most lkely boiling out of the carb. If it has a GLASS fuel bowl type filter near the carb then after shutting down the enginne watch the fuel in the glass bowl.

If the car is running fine otherwise then there could not possibly be anything wrong with accelerator pump. If something wrong with accelerator pump then there would be significant hesitation when ever the gas pedal is pressed down (even just a little bit) while driving.

AS long as the engine is little more than 1/2 way warm then the choke doesn't need to close unless it's a cold day.


I have problems with gas boiling out of carb on at least 4 of my vehicles with carburetors. Especialy the motorcycle. The 56 Packard will do the same on hot days.

Also check the heat riser on the exh manifaold to make sure it is not stuck closed.

Bottom line:
Look for a heat problem. Altho even curing any heat problemss may not solve the boilingg of gas from carb completely. This is NOT an uncommon problem with modern fuels.