My 1995 Chevy 3500 6.5 recently died while going down the road. It has done this since day one. But this time it wont start back up. I've read about the pmd and mine is in the front bumper. I got a used one off of eBay put it in and does the same thing starts runs really rough for like one second and dies. Probably the pump?? Any advice would be very appreciated...thanks I replaced the lift pump about a month ago. Has fuel to filter and fuel at the t handle valve in front I plugged the pmd directly into pump harness to rule out the 6 foot harness. The d I got off of eBay was working when taken off.