Sorry for the wait...
Okay, Ive just updated FS 19 to 1.1.3 proper via steam, restarted steam, deleted input xml, started game, tried mapping, still no joy.
I retried this twice to make sure, and also tried with both combined and separate pedals. Each time deleting the xml. Nothing.
To show you that the wheel is working fine and everything else is working but for the accelerator, Ive mapped a couple of buttons to it, and the brake pedal...I can map more if needs be, but it shows as enabled in the log anyhoo.
Ive attached the log.txt file
Ive also attached a link to a screenshot of me pressing the accelerator pedal in the profiler with this reply in the background (to show you I've done it tonight), to confirm my pedal is fine. https://imgur.com/a/MON2Bnj