The valves are not designed to hold back the pump when running, IF your using under a 3gph nozzle the pressure can be as high as 200 psi at the nozzle tip or at the solenoid.
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12v solenoid to prevent siphoning under vacuum, or if your tank is mounted high than the nozzle.
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The valve in our set up is to be used in conjunction with the pump which means when the pump is on the solenoid valve is open.
The valve should have a marked in and out on it.
There are other solenoids out there that hold much higher pressure but cost much more and not all are methanol compatible, Nitrous solenoids will work for a while but tend to go bad after a few months due to the methanol.
I would just be running a 1 bar map sensor powered by the voltage faced controller, We have others with that same set up with no problems.