This AH F3F ( Simmarket) has me baffled. Has a pilot. It looks fantastic in 2024 and flies just like it did in 2020. The only issue I can't figure out is trying to cold start. The normal start procedure goes okay, but she just won't catch and stay running. It's like she's getting no fuel. No problem using the runway start option where she's already running. To double check whether this is a 2024 issue, I also installed the F3F in 2020, where it always worked fine, but now the cold start issue is over there also. One difference is that in 2020 Ctrl-E works. In 2024, Ctrl-E gets her cranking but she won't catch.
Forest
This sounds like another identified bug with FS20 "ports" over at the dev board, where the fuel line from the engine pump to the engine is getting sucked dry as you throttle up when using the "modern fuel system". I'd expect a patch for this behaviour at some point.