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 I am no expert at this thing. I'll try an answer last two questions.
 Dealer told me fuel pressure should be between 50 and 60 PSI. I could not hold that back without it squirting out someplace. So holding finger over the end of fuel line is not a proper test but worked for a shade tree mechanic.

 Fuel filter between tank and injector sounds like a good idea. With that being said the pump has a filter on it. Any fuel it takes in has to pass through this filter first. I know this because I pulled the pump and pumped out tank. One reason was to get rid of what could be bad fuel and other reason to clean tank.  Fuel filter did not look that bad but I did try to clean it just the same. One thing I did not do was pull filter off pump and try it. I think because pump was working but just not hard enough.

 Well still no mechanic BUT !

 I got it going the other day and ran hard for an hour and half pushing a dirt pile around. Parked it and let t sit for a day. Tried it and it started righted up. Ran it around and parked it again. Two days after that tried to start it again and nothing. Right back where I was. Engine spins but never fires. Machine was setting in park.  Grabbed steering wheel and rocked the whole thing back and fourth. You could feel machine come up against the park gear rocking forward and back.  Hit the key again and let pump run up and turned key. Engine didn't turn over only about once and started right up ! What the heck ? It is a 2014 so I don't think it has the tech for a gear sensor or does it.
 I think maybe a fuel pump problem now. While rocking back and fourth I could her the fuel in tank slashing around pretty good. Looking fuel gauge it says it's full and I know it's not.

 So it has been running OK but I thought the battery was a little weak when starting so I replaced battery and it would fire right up. We took it for about an hour drive on a town road and got back and parked it. Next day tried to start it and it would not start. Engine spun no problem but if never fired. I replaced spark plug and check it and plug was sparking fine. Installed plug and still nothing when turning over engine. Pulled plug and plug was dry. Poured some gas in plug hole and reinstalled plug and it fired right up and I ran it around for about a half hour. So it has to be getting gas from gas tank I think.
 I shut it off and try it again. Same thing will not start and I pull plug to fine it dry again. OK I guess not getting fuel ? It must be getting it to run like it does after priming it. I pull gas line at carb and turn key to have pump kick on and it shoots a steady stream of gas. I do not have a pressure tester.  Next is hook fuel line back up and pull injector. Rig it up with the 9 volt battery and it opens and I try spraying carb cleaner through it and I get one drip. Hook injector up back up to fuel line and turn key on and get one little mist you can hardly see. OK new injector. I hook up new one and it shoots out a pretty good amount of mist. Put that back together and still nothing.
 I know this is long but what am I missing. It has spark and is getting fuel but will not start. Where do I go next ? any ideas ?