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The rattle of diesel engines lures me from behind the counter . Second , there is much more variation in the sizes and loads of diesel vehicles than gasoline vehicles . Since the power output of diesel engines ( or for that matter , gasoline engines ) is limited by the amount of air they take in , it is common practice to employ some form of forced air induction to increase maximum power . However , emissions control technology will need to advance for a new generation of diesel vehicles to meet EPA standards . Probably the biggest emissions challenge for designers of diesel engines is reducing NOx emissions . FIMS analysis of sediments obtained from storage of diesel fuels has provided valuable clues to the chemistry of sediment formation and possible strategies for managing the problem . This will complement other assets in protecting the perimeter of the Sea Base from the threat of diesel submarines or swarming small boats , or in other more conventional sea control applications . Because the natural color of diesel fuels varies from nearly colorless to amber , red dye concentration cannot be measured accurately by simple visible absorption spectroscopy . The implementation of diesel regulations in 30 CFR parts 7 , 36 , 57 , 72 and 75 has resulted in an increase in requests from owners of approved equipment , typically Mine operators , to use modified permissible diesel-powered equipment , including mobile diesel-powered transportation equipment . But it would be incredibly stupid for the North Koreans to entrust scarce , hugely valuable nuclear warheads to lousy delivery systems aimed at civilian targets when they have high value military targets and hundreds of fishing vessels and dozens of diesel submarines , or simply can emplace them under invasion corridors inside North Korea itself . Care must also be taken to avoid allowing dirt to enter the fuel line as this can cause engine operational problems , especially with the injectors of diesel engines . Exhaust emissions are the Achilles ' heel of diesel engines .