[bestgenman]

You are not getting fuel to the delivery valves of the high pressure injection pump. The high pressure injection pump has the steel lines going to the nozzles. The most common problem is plugged fuel filters but in your case, you have new filters so not likely unless bacteria has your fuel contaminated. Several units have a momentary switch to operate the lift pump (an electric pump to bring fuel to the high pressure injection pump), most Kohler sets used a Carter pump but any 5 psi ~ output pump will work.

Get power to the lift pump either by the switch or temporary jumper. Remove the inlet line to the high pressure injection pump from the secondary filter and see if there is fuel flow. If no flow, try the hose on the outlet of the lift pump. If no flow there your lift pump is not working, if there is flow your filters are plugged.

Hope this helps
Gordon