I've got an M916 that has a power steering problem. I first noticed it when I found the fluid low and added some. The fluid over flows after the truck is shut down. If the cap is on it come out like a geyser. I've tried turning it from lock to lock a hundred times and tried bleeding the lines to the cylinder on the passenger side. I even threw another pump on it. There are no leaks. Any ideas where the air is coming from. The TM says turn lock to lock and you're done.