Fry master 2 bin fryer model# FM245

Will not pump oil up from holding tank. I replaced the pump because it was bad. While I was at it because no one wants to clean anything I pulled all the plumbing to the filtering system apart and cleaned it. Put it all back together and it won't pump the oil. Pumps air just fine but won't pull the oil. So after all that I thought maybe the motor wasn't turning fast enough so I replaced that. Well no luck still won't pump.

I'm out I ideas anyone know any tricks or have you had this problem?

Thanks in advance!!