The top right of the Mooney annual inspection/100 hour says "1. Inspect fuel injection system, clean screens & injector nozzles (refer to Textron Lycoming O/H Manual, Section 8 or TCM Service Manual."
So with a wrench remove the fuel hose
And a socket
To clean the screen you tap it on the table and stuff comes out.
and you keep tapping it and more stuff comes out
It kind of looks like someone left a paper towel in the line. There is a spring that will allow fuel to bypass.
Check down the bore to see what is there and replace the O rings for RSA 5 fuel servo
Reassemble and now know that fuel will go to the injectors as planned.