I had a customer haul his truck to me after him and a buddy put a fass 150/150 system on and he drove it down the highway and noticed fuel and oil everywhere. it filled the crankcase with fuel. I got to looking at it and they had the rail and the hp pump returns together with no exit. then had the injector return to the original return line to tank. only thing I can come up with is it blew front seal on the injection pump any help would be appreciated. thanks