I have a MF 2200 that needed the engine rebuilt so I finished that up and got it running now I'm not getting any oil to the hydraulic pump. When I pulled off the pump the put a plug in the suction line to keep it full and then when I put the pump back on I removed the plug and hooked up the pump and filled hydraulic tank. I got the engine running and noticed that I had no hydraulics on the mast. I thought at first it was just air and it would work itself out but nope. I pulled the suction line off and it is full of oil at the filter however there's a upside down U in the suction line right before the pump and I'm getting no oil beyond that point. I've tried forcing the oil over the hump with air even moved the line up so it was at a 45-50 degree angle and tried using air pressure to move the oil and so far have just managed to cover myself in oil. I'm considering cutting the suction line at the hump and putting in something that would allow me to fill it on the pump side but would prefer another method. One thing the oil seemed to come out of the filter housing a lot faster when I first pulled the line than it is now. Of course it was warmer then too so maybe that's why. All I know that I had the tanked filled to full and yet it's not pushing the oil hard enough to get to the pump and the I'd like to know why in world the person who designed this setup didn't run the suction line along the from and up to the pump versus putting a massive hill in the suction line.