Your clutch slave bleed fitting could be plugged as its the lowest part of the system. Pull it, hold your finger over the hole while your assistant checks it (take the pressure off first)

As mentioned, you dont have to open and close anything, just pump.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"