Replaced lift pump today. The old one was totally dead. O pressure. The injector pump actually sucked in air as if under vacuum when the pressure fitting was actuated on both the before filter side and at injector pump. Is this possible. The truck has been running rough only at high rpms...
New to forum and looking for help. I think I might have a lift pump problem in the making. It starts falling on its face when planting the accelerator and revs above 2500 rpm. It pulls like crazy between 1500 and 2200. Has 90,000 miles and plenty of performance mods. It seems to have been...
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