Hi, Ron; Any reputable auto parts store should be able to look up the correct pump for your truck. The VIN number should be able to tell them all of the info they need. Measure wheelbase from the center of the front wheel hub to the center of the rear axle. Going from many years of experience, you'd be better off buying an OE pump than an aftermarket one. We won't even sell the aftermarket ones because we'd be replacing it too often. JMHO. When it comes to replacing the pump, sometimes it is easier to remove the bed, leaving the fuel tank in place. Easy to get to. Just need a little help lifting the bed and sliding it back far enough to gain access.
I have a 2006 F150 5.4l with a 145 wheelbase. it needs a fuel pump. Can I use a 144.5" on this vehicle?