Clutch problem You have to pump the clutch at time to get it to work

Now that is spooky. The clutch would have no connection to the engine starting, only cranking.
Its possible the fuel pump relay is failing and for some reason either waiting or the vibration of pumping the clutch is getting it to work.
The relay should be under the dash near the pedals.
I would check fuel pump voltage when it fails to start.

no fluid in the clutch reservoir due to a failed clutch slave cylinder
time to replace both the clutch slave and master cylinder

I mworking on my blazer AC unit now . You have a problem with the compressor clutch or the compresser Its likely the clutch its supposed to cycle about 8 times per minute . So it goes on then off 8 times per munite this is normal . However if the clutch dosen't spin then the belt will drag on the clutch pulley this will stall the engine until the belt wares out but this will damage every part that the belt rides on . The water pump the alternator powersteering pump and belt tenisinor not to mention the belt .It sounds like your clutch is seized try not to run it until you can figure out why the clutch isn't spining

the clutch is hydraulic . you need to look on the fire wall for a reservoir . and fill it look on the cap it will tell you what fluid to use . after you refill it pump the clutch a few times the wait 5 minutes and pump it again . check the fluid again pump again if the fluid is leaking out you'll have this trouble again till you fix the leak.

if u know u have every thing hooked back up the way u took it apart then i would rebleed the system that should do it.

The clutch hydraulic system is very small. Check the resevoir is full. If empty fill. Try clutch. Still problem ? Bleed the clutch slave cylinder at the trans bleeder. You dont bleed this clutch like brakes pumping up several times. Have someone push clutch to the floor and hold it there, then you open and close bleeder while keeping pedal to the floor. Check the fluid level every time you open/close the bleeder as this system is so small and will empty quick.

try bleeding the clutch slave cylinder its just like bleeding brakes just follow the line from the clutch master cylinder where you checked the fluid to the slave cylinder and pump the clutch three times and hold it to the floor while someone loosens the relief valve you repeat until no air comes out and it is all fluid then you check you fluid level again to make sure it is full then if the problem continues it might be time for a clutch replacement

Sounds like the seal in the new clutch master cylinder. I've seen that same problem in the hand brake system in small 2 and 4 seat airplanes. ( I'm and aircraft mechanic) The problem is not air in the lines so bleeding won't help. The piston seal is intermittantly failing to seal. That is whty the function can return without any apparent reason as the seal has seated itself. The only cure is to replace or rebuild the master cylinder. ( Yes, even new or rebuilt ones can have a defective or improperly installed piston seal)

Hope this helps

Hi, there seems to be a problem with the hydraulic clutch actuators, you should checkt the hydraulic cylinder driven by the clutch pedal for operation. If this cylinder is working, the problem hast to be the other cylinder operating the clutch.

easy replace both parts then fill the clutch reservoir,crack slave cly bleeder to let gravity bleed let 1 to 2 reservoirs flow through,tighten bleeder and pump clutch pedal,pump 4 or 5 times hold down pedal get 2nd person to crack bleeder while pedal is down,tighten bleeder before releasing pedal,should work fine