There should be a bleed plug on the primer pump housing. You should back that out until it will allow air and fuel to escape while pumping the primer pump. Close it off when air free fuel escapes. That is usually the pre filter. If the second filter (final filter) follows the one with the pump on it and it usually does, you should open the bleed valve on that filter housing and continue to pump until all the air is out of the second filter, then close it off. You can try and crank for 10 or 15 seconds and wait a couple of minutes and try again. It may help to pause before you crank the engine with the key on, in case there is an electric fuel pump in the system that may help you clear some air, and send it back to the tank via the return line. If it does not fire up after several tries you should probably call the local Cat dealer and see what they advise as a procedure to clear the air. If someone recommends using ether, be sure it is someone who is very knowledgeable about the procedure specific to your engine and has done this procedure before. In general the use of ether is not recommended.
As an aside you should not fill the filters with fuel. That will allow unfiltered fuel to reach the pump and injectors which have very precise tolerances. Any particles in the fuel stream that reaches them wears the surfaces. The procedure should be to replace the filters and then prime using the pump until all the air clears in both filters and then start the engine. That only allows filtered fuel to reach the engine. Hope this helps.
Later Ed
