Well HSV (high speed valve) is the same solenoid type valve but can operate at high speeds/same as fuel injector (maybe a bit quiker from what i read)
Depending on your set up, check valve can do. The delay will came from need to build up krack presure. For this reason you can simply compensate with a bit earlier activation of the pump.
As long as you have check valve that will hold manifold vacuum i cannot see the problem.
Comments anyone?
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