I replace the fuel pressure regulator in my M119 to try and alleviate an intermittent long cranking issue. At the recording of this video the part is only around $30, and is a good part to proactively replace before getting to more costly items! This is a very straightforward repair and can take 15mins or less with the right tools (and if you don't drop the snap ring into the abyss like I did).

Link to part: https://amzn.to/3tViJoe
https://www.pelicanparts.com/cgi-bin/...
https://www.fcpeuro.com/products/merc...

My Gear!
Sony a6300 Camera: (here's the better and cheaper a6400) https://amzn.to/3dQQz3s
GoPro Hero 7 Black: https://amzn.to/3uGSsGb
DJI Mavic Air: https://amzn.to/3pUXZVY
Moukey Mic: https://amzn.to/3dM6mjY