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My thought would still be to rebuild the pump, as the first option. If the pump seals are bad, it's possible that it would pump fluid with the hose off (no backpressure resistance) but that when trying to lift an actual load it would not be able to generate enough pressure and the fluid would...

It should squirt out about a shotglass full with each pump, and fill a quart container in like 20 seconds of pumping. As NDT said, rebuilding the pump is probably the easiest place to start. There are instructions in the guide in my signature here (which is compiled from posts around here...

Sure, take a line off of something (e.g. cab latch), or the output line off the pump, and see if fluid comes out when you pump it.

The reservoir shown in the manual on the driver's side is for the winch, not the cab lift, tire lift, or suspension restraint (for air transport). The reservoir for the cab lift (and others I mentioned) is on top, behind the cab, between the spare tire and air snorkel. It's about the size of a...