The Fulmar I had 155IG internally versus 135IG for the F2A. The Fulmar II began production in Jan 1941 and it had 155IG internally and a 60IG drop tank. It's doubtful that the useful range of the F2A was any better than a Fulmar.
B-239 had max range of 1350km, Weal, Weal and Barker gives 1287km for Fulmar Mk I, max for F2A-3 was 2700km. I have a better source on Fulmar but it is in my attic.
Juha