I have a very unusual situation with my pickup. It started with crank no start. After replacing the fuel filter and a couple of hoses it still would not start.I removed the fuel pump and tested it-good. Checked the push rod for pump-good, checked the camshaft for wear-good. It has appr. 7/32" or 5.5mm of lift. I'm at my wits end with this thing. Has anyone ever seen this? Any help will be greatly appreciated.