We keep getting air bubble into our fuel (lots of air) when we accelerate heavilly.
We replaced the injector pump in the last 5000 miles.
We installed marine injectors in the last 500 miles.
We replaced the lift pump in the last 1000 miles.

Trying to alleviate the air we have:
Replaced the Feed and Return Lines with OEM parts
Replaced all the bulk fuel line with new hi pressure fuel line
Replaced the fuel bowl, heater, water sensor, and filter
Replaced all the injector return lines
Installed a glass sight tube in line from the filter bowl to the IPump

And theres still air getting in somwhere

what altitude are you in?

Air leak in fuel line and/or connections pre LP.
To much vac in tank(plugged cap)
Plugged sock on pickup tube in tank.(blow line back pre LP to tank)
LP not putting out (check fuel pressure)

worst case ... invest in a airdog system