Thanks for the tips gentlemen, i will likely be using some of the fuel in a Ram truck with DPF equipped engine so I think ai’ll try to rinse out as much hydraulic as I can. I am surprised to hear that I don’t need to line the drums with an epoxy paint or anything. I have an mmg. 25 USMC genset that had the tank full of dirt, nails, gravel and debris (sabotage by other bidders when Gov liquidation was running things) Anyway, i dropped the tank and had it cleaned and, after a convincing sales pitch, lined with a “lifetime” warranty epoxy product at radiator/fuel tank shop , i was thinking about buying a DIY tank lining product doing myself but maybe not necessary. BTW, i was able to transport both barrels in the back of my prius, they had been set aside for me until i brought my truck to the site, but the Super was getting ready to toss them so ifigured i better at least get one. Aftergetting the first one in , sure enough iwas able to fit the second! The guys on the jobsite thought that was funny.