Got two 1956 gas forced air furnaces in a rental. Both have the same problem--no gas flowing to the burner. Both have identical gas train systems--manual valve with an outlet for a pilot, gas valve with a thermcouple going to the pilot, then an electric solenoid activated by thermostat to release gas to the burners. Have gas up to the inlet side of the gas valve but no gas coming out the outlet towards the electric solenoid valve. Assumed it was the thermocouples. But I swapped in new thermocouples and still no gas. I have gas at the valve because I can pull down on the gas check thingy at the bottom and gas comes out. But nothing is going thru to the solenoid. Any ideas out there? Gas was shut off for a while over the summer and I figured this caused the failure of both thermocouples since they had been hot for about 25 yrs at least.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13