This video is about how to properly diagnose an under hood rattle on a GM vehicle equipped with a high pressure fuel system. The owner suspects the rattle may be caused by a faulty or poor performing in-tank fuel pump issue. Airtex is committed to providing the most up-to-date, in-depth fuel pump replacement information that professional technicians need to diagnose, repair and install today's complex fuel delivery systems. Airtex is the only U.S. automotive aftermarket manufacturer that designs and builds electrical AND mechanical fuel delivery system components, including modular reservoir assemblies, electric fuel pumps, mechanical fuel pumps and in-tank sender and hanger assemblies, for a full range of car, truck, fleet and specialty vehicles.