Thanks for the reply. The car came with a mechanical fuel pump, an electric fuel pump was added by Datsun in 1982 to fix the vapor lock problem common with '73 240Z's. (They also added asbestos around the fuel lines, which I would now like to have removed.) The mechanic checked both the electric and mechanical pumps, and the filter, and all checked out OK. He did hook up a bypass to the mechanical pump, took it for a test drive, and if worked fine for him. When I took it on the highway however, it gradually slowed to a stop, but not for 50 miles. Any suggestions ? Casey