Re: diesel fuel
"Farm Diesel" = Off Highway use diesel, red dye. Same as recreational marine diesel. Until recently had a higher sulfur content. As not as much is sold at the gas station may be stale and already have the diesel bug.
Recreational marine diesel = the same fuel, although some vendors (Valvetect, etc) add an antimicrobial additive to kill the diesel bug. Red dye (No highway tax)