The timer relay has a capacitor in it which basically acts like a 10 second battery. To see if power is getting to the solenoid, you can simply touch a screw driver to it. When energized during those 10 seconds, the solenoid will act like a magnet. If you feel a magnetic force with the screw driver, then the solenoid valve assy will need to be replaced or inspected because the spool inside the assembly is not shifting and turning off the fuel supply. If the solenoid does not become magnetic, then no power is getting to the solenoid and you will need to tracce the source of your electrical problem.