I've had tractor pumps ,tanks ,filter housings ,you name it , apart for maintenance and have never ,ever, seen any red dye residue and they have always been used with red diesel .
However Customs and Excise do have extremely sensitive equipment that can detect the merest trace of colour ,so if you have used red in the recent past and are now using white they might be able to pick it up .
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Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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