Gents, my wife called me and stated the truck smells like gas...............I assumed she was following an old jalopy and was getting his fumes but alas it was indeed our truck.
Smelled awful and showed no visible leak anywhere that I could find with it up on ramps running or not, I crawled all around like a monkey and shined my light everywhere, traced the lines from the tank clear up behind transmission housing up against firewall and found no evidence of any leaks etc.
Next day remote started it and let it sit for 10 mins or so and went out to check it out and it had a delightful pool of gas about 5" in diameter underneath it.
I was not dressed appropriately for another crawl around unfortunately but moved it out of the way and drove my 5100 mile museum piece 2017 instead for the day
Took it to the dealer and of course he could not get it to leak for the life of them for 2 days.
I dug around and found this and gave it to them and they are now conducting this repair, I thought it reads that this truck should never have been sold without this repair having been done as it was purchased by me in October of last year so 2020.
Anyway hope it helps speed things up if anyone else gets the gas smell in the cab mystery.
Yes I know there is a TSB sub forum and this will go there as well, I could not find it over there myself but it may be somewhere.
High pressure fuel pump.
https://static.nhtsa.gov/odi/rcl/2019/RCSB-19V837-8595.pdf
Cheers