Ralph,
When was the last time you pressure-tested your propane system?
Even when the system is operating normally, this should be done on a routine basis. Your system is experiencing problems, making it all the more important that you pressure test it if you haven't already.
If you don't know how to pressure test your system, just say so and we will point you to some threads that explain the process.
That said, is your remote solenoid working properly? If the valve on your tank is open, then more than likely the solenoid valve is not opening properly. These are designed to fail in the closed position, so if you have power tot he solenoid and the valve doesn't open, it's time for a new one.
All this assumes you actually have propane in the tank. The pressure gauge attached to the propane system does not tell you how much propane is left in the tank -- it is only there as a tool for pressure testing the system.