Originally Posted by Purplefade

Yikes, is there no happy medium between the two?

With 135,000 on the clock and this thing moving fuel, I’m sure you will need all of the gaskets and o-rings also, but at nearly $600 I might go with the less expensive pump and see if ECS also sold just the gasket and o-rings - may... save you a few bucks.

That said, I would check the fuel pressure at the rail and also maybe consider checking the fuel pressure regulator. Wondering if it’s a fuel delivery issue coming from the pump or the FPR not holding pressure at the rail... - that said, I have the 4.4 so I’m not 100% sure on how yours is setup.