GQ Dual Cab. TD42Ti with fruit.
Yep, it does. Pump specs, as opposed to what is actually delivered at the injector pump is the issue from memory. My old Walbro, rated at 5 psi, only delivered about 1psi at the pump, nowhere near enough.Does a TD42 need that much flow and fuel pressure? Carter 4600 yeah no problem. They even run fine with a Facet pump.
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No doubt the motor spec is a factor too, with 12mm pumps benefiting from the larger lift pump. In my case Oldmav advised getting the 4601. I think Geeyoutoo uses one on his ZD also. As you say, the 4600 would be fine too for many people.