I replaced the lift pump and the fuel filter about a month ago before the old VP44 let go on a 2000 ctd. I fired it back up and it held 8 psi at the VP44 all last night. Fired up this morning and it pulled 7 psi. 15 minutes later of idling in the driveway, it has zero fuel pressure... what gives? Fuel heater problem? Something I'm overlooking??