I worked as a heavy equipment mechanic in the field, only fuel we got in Southern California was #2, the red dyed is exempt from road use tax, the IRS would send out a uniformed officer with a badge, pistol and hand cuffs on his pistol belt, he would dip the fuel tanks of any vehicles on the job that might also be used on the road, he use a clear plastic tube and put his finger over the end and pull up a sample, if it was red he issued a citation and its expensive, he would even dip the operators personal diesel pick ups, some times they got carried away with the red dye and it would plug up the fuel injectors, always keep a diesel tank full especially when you store it as the moisture will build up over a short period time, always check your water separator if it has a clear bottom on it, never run out of diesel as some engines can be a real bitch to re prime, just putting fuel back in the tank and cranking will not cut it.
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