▁modern ▁dies el ▁engines ▁were ▁not ▁designed ▁to ▁accommod ate ▁b iod ies el , ▁while ▁many ▁heavy ▁duty ▁engines ▁are ▁able ▁to ▁run ▁with ▁b iod ies el ▁bl ends ▁up ▁to ▁B 2 0 . ▁Trad itional ▁direct ▁injection ▁fuel ▁systems ▁operate ▁at ▁roughly ▁ 3 , 0 0 0 ▁p si ▁at ▁the ▁inject or ▁tip ▁while ▁the ▁modern ▁common ▁rail ▁fuel ▁system ▁oper ates ▁up wards ▁of ▁ 3 0 , 0 0 0 ▁P SI ▁at ▁the ▁inject or ▁tip . ▁Com ponents ▁are ▁designed ▁to ▁operate ▁at ▁a ▁great ▁temperature ▁range , ▁from ▁below ▁free zing ▁to ▁over ▁. ▁Dies el ▁fuel ▁is ▁expected ▁to ▁burn ▁efficiently ▁and ▁produce ▁as ▁few ▁em issions ▁as ▁possible . ▁As ▁emission ▁standards ▁are ▁being ▁introduced ▁to ▁dies el ▁engines ▁the ▁need ▁to ▁control ▁harm ful ▁em issions ▁is ▁being ▁designed ▁into ▁the ▁parameters ▁of ▁dies el ▁engine ▁fuel ▁systems . ▁The ▁traditional ▁inline ▁injection ▁system ▁is ▁more ▁forg iving ▁to ▁poor er ▁quality ▁fu els ▁as ▁opposed ▁to ▁the ▁common ▁rail ▁fuel ▁system . ▁The ▁higher ▁press ures ▁and ▁t ighter ▁toler ances ▁of ▁the ▁common ▁rail ▁system ▁allows ▁for ▁greater ▁control ▁over ▁atom ization ▁and ▁injection ▁timing . ▁This ▁control ▁of ▁atom ization ▁as ▁well ▁as ▁comb ust ion ▁allows ▁for ▁greater ▁efficiency ▁of ▁modern ▁dies el ▁engines ▁as ▁well ▁as ▁greater ▁control ▁over ▁em issions . ▁Com ponents ▁within ▁a ▁dies el ▁fuel ▁system ▁interact ▁with ▁the ▁fuel ▁in ▁a ▁way ▁to ▁ensure ▁efficient ▁operation ▁of ▁the ▁fuel