Diederrick,
If I were doing the troubleshooting, I will check these:
- Residual Pressure Loss.
- Test the FP for max. pressure capacity.
- Confirmed that the air leak test created a positive pressure in the air box.
You could bench test the FA. The actual test would only take several seconds. It would be either good or defective. The fuel pump test would also takes less than 10 sec. to confirm whether the FP is good or not.
And the most important thing is doing the air leak test correctly. You need to isolate the system (airbox) and confirm that a positive pressure was created during the smoke test. Email me if you need some help.
Tony