sounds good, so: pump -> solenoid -> injector . with a tee just after the pump -> pressure reg -> solenoid -> tank ?
maybe use the pressure switch on the shurflo pump to switch the 2nd solenoid. that way the pressure will build up fast as possible. but may run into pressure spike problems if the pressure switch is set too high.
or
pump-> solenoid-> injector -> press reg & solenoid straight after injector -> return to tank ? although the 2nd solenoid after the pressure reg wouldn't be doing anything. since the pressure is just going to be lost out the injector. long as the pressure reg is installed right after the injector it should work almost as well. but wouldn't require the 2nd solenoid.
another way to do it is use a dc motor speed controler. adjust the motor speed to hold the pressure required. speed and pressure will vary slightly with supply votlage( unless you go for a more expensive controller) . but thats not much of an issue when the car is running. have disconected the pressure switch alltogether on mine (100psi shurflo pump). will run up to 130psi on my setup, but have it set to around 100psi, as i have no idea if it would be reliable at that pressure. hardly made it over 80psi with the pressure switch. built the controller from a kit for around 30 dollars
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