Quote:
Originally Posted by KULTULZ
Today's fuel evaporates much more quickly as it is designed for fuel injection and closed EVAP systems.
An electric pump at the tank will solve all the problems.
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Whether the fuel in the bowl boils or not, it is evaporation of the fuel in the bowl that is causing the hard start problem after sitting a few days.
The fuel evaporates into the atmosphere (via the bowl vents).
A quick start is not possible as the fuel needs to be replaced by the pump.
The mechanical pump is drawing fuel (or attempting to) through two supply lines and a filter (should be on pressure side).
The mechanical pump does have an anti-drainback valve but it will not hold that pressure more than a day. It depends on a quick start with the fuel in the carb bowl to reprime.
Either you are going to have to modify the carb with an EVAP system or use an electric supply pump (with or without the mechanical pump) to overcome this problem.
Your vent system seems to have been unaffected by this modification.
Most of this is caused by today's reformulated gasoline. It is not blended for carburetion any longer.
