Toyota Air Injection Pump Safeguard/Fix - Simple and cheap
As many have dealt with, the factory air pump draws in air from the engine bay but uses a small piece of foam suspended above small turbine blades to filter the air. The foam breaks down over time and contacts the fins and gets sucked into the system. Many have cleaned out the foam gunk and more have had to do larger jobs of replacing pumps etc. So the easy safeguard/fix, is a cheap air filter with a 1" opening. The lid comes off with one screw, then I removed the foam, and carefully pried off the factory intake end. The filter goes on the end easily and all fits back where it belongs.