"One-way" fuel line valve..?
Once the motor cranks 2 revolutions, stop cranking.
The mechanical pump has been cycled, the spring and diaphragm inside the mechanical pump is still sucking fuel by way of the diaphragm and spring, adding an electric pump to pump fuel already being sucked is not nec.
By waiting a few seconds not cranking, the fuel keeps moving by the vacuum/spring pressure, - then crank another 2 revolutions, that recycles the mechanical pump to re-supply the suction vacuum.
Crank- crank- crank- cranking is like continuing to pull the trigger on an emptied chamber, - wait .
Study how a mechanical fuel pump works, it already has 2 one-way/check valves built into it !
Once the spring is pulled, that cycles the diaphragm .
Have you Ever pulled a fuel line off, a long time after the engine was running, and get a shot of pressurized fuel, - that same spring holding pressure is the same spring pulling/holding vacuum to the fuel tank, - even when the engine is NOT turning ! !
Once the motor cranks 2 revolutions, stop cranking.
The mechanical pump has been cycled, the spring and diaphragm inside the mechanical pump is still sucking fuel by way of the diaphragm and spring, adding an electric pump to pump fuel already being sucked is not nec.
By waiting a few seconds not cranking, the fuel keeps moving by the vacuum/spring pressure, - then crank another 2 revolutions, that recycles the mechanical pump to re-supply the suction vacuum.
Crank- crank- crank- cranking is like continuing to pull the trigger on an emptied chamber, - wait .
Study how a mechanical fuel pump works, it already has 2 one-way/check valves built into it !
Once the spring is pulled, that cycles the diaphragm .
Have you Ever pulled a fuel line off, a long time after the engine was running, and get a shot of pressurized fuel, - that same spring holding pressure is the same spring pulling/holding vacuum to the fuel tank, - even when the engine is NOT turning ! !