Hi. I am planning to get an AEM kit and read in the instrucitons that the top of the tank should be lower than the nozzle location. I assume this is so that Meth doesn't flow out of the tank through the pump and out the nozzle due to the pressure differential (when the pump is off). Setting it up like this will be tricky to achieve in my car so I am thinking I need a solenoid in the line that opens when the meth turns on. Can someone recommend a solenoid valve? Do others mount the nozzle below the top of the tnak without problems?

 

You would need a check valve but they usually lower your effective water pressure so you'll get less flow. The nozzle usually needs to be higher than the location you are feeding off of the tank. So it'd need to be higher than the spot you have the water coming out of the tank I think. Where are you planning on injecting the water/alky into?????