I just removed the fuel hose, there was no pressure when solenoid was unplugged so I tested the 1/4 line at the top of the regulator per your instruction, there is more than 4 lbs of pressure, probably more like 7-8 with the meter. I am not sure if this has an electric throttle, I want to say no it doesn't because I see the cable at the carb and it has the same play as the pedal does I will go out and check if there is more or if the cable goes right to the pedal or to a electronic box. They say it always had power and didnt lose power like it does now, the reason for rebuilding the regulator in the first place was because the idle was horrible and you had to keep it running, if it died then you had to disconnect the LP and reconnect then it would start back up...or you could wait.. it was like you had to relieve the pressure...