How to fill hydraulic reservoir for roof pump?

Hello all, hoping someone has an idea, followed instructions above to get to the pump and the fluid level was low, bought new fluid (yikes) and filled up the reservoir as high as possible, though not yet up to min level. Tried raising the roof to get fluid into the system but none of the fluid seems to be getting sucked up from the reservoir.
Pump sounds like it is running normally.

Can it be air in the system?
have tried running it with the filler cap on and off,
have tried loosening the emergency release screw.

Is there any way of raising the roof manually without the pump to get it started?
or to allow me to "close" the roof and run the pump backwards?

To raise manually, just loosen emergency release screw and from the inside push/raise the roof. Support it with a wooden pole or two…

Emil Silenhag said:

To raise manually, just loosen emergency release screw and from the inside push/raise the roof. Support it with a wooden pole or two…

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This won't work because the rams first push the front scissors forward to release them from the hook in the roof. That is why you need to secure the roof with straps when the hydraulics stop working and you lower the roof through the emergency release screw. The roof lowers, but doesn't lock into place.

TripleBee said:

This won't work because the rams first push the front scissors forward to release them from the hook in the roof. That is why you need to secure the roof with straps when the hydraulics stop working and you lower the roof through the emergency release screw. The roof lowers, but doesn't lock into place.

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Good point, sounds logical. I’ve done it a couple of times, but can’t remember details. I guess that those I helped first lowered the roof with emergency screw, and then came to me..