The use of copper in fuel systems is poor practice. For gasoline, copper can be picked up from the fuel line or other copper bearing material. Metal deactivators are added to prevent the trace amount of copper from acting as a catalyst in the formation of various undesirables. From my prior life I am aware of an instant where copper was used in a jet fuel system application. During hot fuel testing copper was obsorbed from the tubing and plated out on internal fuel metering componets resulting in performance problems.
Yes many people use copper and no problems result. However it should be avoided as there are better materials in terms of strenght and compatiblity with fuel.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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