Z18 with 200 hours. Stopped running and wouldn't restart. Detached fuel line after second fuel filter and turned key on: fuel pump sounded like it was working but no fuel. Detached fuel line between second fuel filter and fuel pump and turned on: pump making noise but no fuel. Vacuumed fuel out of tank, put in fresh fuel and turned key on: no fuel past fuel pump. Replaced fuel filter between gas tank and fuel pump. With fuel in tank when I undid the filter between the fuel tank and fuel filter there was no fuel coming out of the hose to the fuel tank. Turned on key and still no fuel past fuel pump although fuel pump sounds like it is trying to pump. Any suggestions?