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Message:: [QUOTE="Ovalhead4Life, post: 2358972, member: 78518"]CAT motors also have a unique potential problem, unrelated to the fuel tank levels but it will drive you insane trying to figure out if you don't know about it or where to look. Your power drops; no check engine light. You change fuel filters... problem goes away but returns when you least expect it. You look for pinched fuel lines, have them blown out, all is well - no blockages. Weeks go by, no problems. Then one day, it happens. Complete fuel starvation. You change the transfer pump, no improvement. Hopefully you didn't have to be towed in. Okay enough torture. Remove the 2 bolts holding the primer pump on its housing, being careful not to tear the gasket. Better yet, get a new one and keep it in a safe place where it won't get bent. In the bottom of the primer pump, there are 2 round brown steel things pressed into the aluminum flange. They are check valves. All the fuel going into your engine goes through those valves; one faces up, the other down. If one of them gets a little loosey goosey, it can and will flip over - stopping all fuel from going through. I used to carry a spare primer pump, just in case - plus a new gasket. I once saw one of those pumps blow the plunger clean out of the housing; keeping a spare is just good PM. Make good choices! And if you are blessed with a CAT engine, be thankful and take good care of it! They don't make them any more.[/QUOTE]