1998 Diesel with an intermittant stalling problem [ this has been going on for 5-6 years] . Truck would run fine for 5-6 months then stall unexpectlly - then restart and run fine. Replaced IP relief to tank ... . no better ... replaced lift pump ... . made it worse ... . remove tank ... . found a tear in screen below suction line and a small piece of plastic between screen and suction hoze ????? where the plastic came from is unclear at this point ... ... ... ..... I haven't put everything back together yet , so I'd better not be hi-five-n and back-slappen just yet , but sure seeeeeeeeeeeems to be a good possibility that this was my problem ... .