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Joseph, frame to frame connections are copper, cab to cab points are copper, but between cab and frame there is rubber hose (as well as frame to engine). That should elleviate any worries regarding vibration fatigue. Ethan, the xm757 will see bio/veggie fuels..... copper lines have not been a...

It takes an astounding quantity of fittings to properly run a fuel line. I'm installing a heated primary fuel filter on the xm757 and the image below is only the feed side, the same number of fittings are needed on the output side. A fixed coupling is not shown in the picture, which connects the...