I changed the Fuel Filter on my 2012 - 242D Skid Steer machine and the primer pump did not refill the fuel filter housing as indicated in the manual. I checked the fuses and all is well. I started the machine and ran it for some time but still no primer pump activation. I operated the machine for about 2 hours and still no re-fill. What do I need to troubleshoot to recify this issue?