Thread: Fuel vent

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Yes it a little harder to start

Originally Posted by Ken1960

Yes it a little harder to start

The three most common conditions that cause hard starting after warmed up are, 1) floats set too high, 2) fuel pressure too high, 3) heat soak from the manifold.
If the floats are too high, fuel will spill out the vent tubes and flood the motor. If the pressure is too high, fuel will slip past the needle seat cause the bowl to overflow, spilling out the vent tubes and flood the motor. If the heat from the motor transfers to the carb (common with aluminum manifolds), it will boil the fuel in the bowls flooding the motor.

Any and/or all of these three will cause hard starts after warm up and excessive gas fumes (strong smell of gas). The floats are an easy fix, just re-adjust them a little lower and see if the problem goes away. The fuel pressure is another easy fix, just adjust regulator to 5# or a little less and see if the problem goes away. The heat soak requires a spacer rated for heat soak, usually made from plastic or wood.

I have experienced all three of the above symptoms before, and fixed them with the above methods. It's worth a try on yours.