hi Mike, my name is***** have a 2003 413 sprinter. customer put 40lts of petrol before xmas. he didn't start or turn ign on. he drained fuel & filled with diesel & started & drove. drives ok but stalls under load in 1st & 2nd. we replaced the fuel filter today. om test drive still same fault. no lights come up but when rev to 4000rpm stalls. in any other gear wont stall but wont rev past 4000rpm.