I'd also suggest that the filter before the pump is a bad idea [only takes a very small amount of sediment in there to stop delivery], and is prolly why the diaphragm split in the pump letting fuel into the crankcase
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics