The fuel line turned out not to be the only problem. I tried to delete the tables and this made the engine also stop working. I just copied the tables back in from the CJ4 and now its almost perfect, except for the PID for fuel constantly overflowing at rapid changes (the windup protection should avoid this). This is rather interesting, as these values are working fine for all other jets and should be dimesnionless…
As for the tables, I don’t mind them being in, but my aircraft doesn’t have either a second shaft, or an APU.
I can have a look at your config in Discord if you want.