I recently bought an 800 diesel. It hasn't run in a few years so I found videos of a guy doing a lot of work on a non-running 800 with an inline IP like mine. I noticed a lot of differences between his fuel system and mine. Mine only has two fuel filters which spin on, his has 3 filters. The feed into the IP is toward the rear of the tractor where his was in the front. He also has a decompression bar and mine doesn't. I wonder if the fuel system or the whole engine has been changed. There is A3493 cast on the right side of my block. I've struggled to find any info using this ID number. If anyone could help, I'd appreciate it.