You may have an airlock in the system. I had the devil's own time getting mine to fill, fill it and 2 days later it was low again.
Finally put the front end up on blocks and kept turning lock to lock and filling, took about 1/2 hour of fiddling but haven't had a problem since.
Del
Finally put the front end up on blocks and kept turning lock to lock and filling, took about 1/2 hour of fiddling but haven't had a problem since.
Del