Fuji Excursion Train part of JR?

I�fm trying to use the Japan Rail Pass Calculator to see if it�fs worth buying the 7 day Japan Rail Pass. I don�ft see Kawaguchiko Station as a choice for a trip. Does anyone know if the Fuji Excursion train is part of the Japan Rail system and included with the Japan Rail Pass?

No it is not part of the JR network. You will need to pay a little extra for the part that is not covered by the JR pass.

https://www.jreast.co.jp/hachioji/fuji_excursion/en/
Scroll down - near the bottom it says you need to pay a supplement. You will also see where it changes from JR to Fujikyu Railways (at Otsuki).

JR Tokyo wide pass=10180 yen cover Fujikyu railway,from otsuki station to kawaguchiko station without extra charge

Redcliff:
JR Tokyo wide pass=10180 yen cover Fujikyu railway,from otsuki station to kawaguchiko station without extra charge

Yes, except the surcharge required when you have a designated seat
(in Car No. 1 of Fujisan Express or Fujisan View Express,
or in Fuji Tozan Densha).
https://e.fujikyu-railway.jp
https://www.japan-guide.com/e/e2361_06.html

I�fm trying to use the Japan Rail Pass Calculator to see if it�fs worth buying the 7 day Japan Rail Pass.

How is your itinerary?

When you travel by JR for a long distance,
a total of fees for sections of your rides may well surpass the actual cost,
which may make a rail pass seem to pay off through actually it's too expensive.