The solenoid isn't the problem. As I said the reg. has 125 psi. tank pressure. That is the reading at the port on the new reg. where the low fuel sensor goes pressure does not change. You can turn it off wait a minute and it will not have any power. Wait 30 minutes and it will rev. and then smother out. I had a 6 series truck 20 years ago doing something similar. It had less than 3000 hours. Finally got ahold of the TIEM plant and found out they had reduced the tension of the valve springs on that model year. Put the old part number springs in it and solved the problem.