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/FUEL DELIVERY SYSTEM Overview.pdf
6810 FDS Overview Flyer 3a 2 1 11 1 56 PM Page 1 FUEL DELIVERY SYSTEM Overview Fuel PumpThe heart of the vehicle the fuel pump delivers fuel to the engine Airtex fuel pumps are designed to meet or beat OE specs and are 100 tested to ensure performance and long life Fuel StrainerThe pump s first line of defense against contaminated fuel Failure to replace the fuel strainer will void fuel pump warranty Fuel TankThe fuel pump on most modern vehicles is housed in the fuel tank Tanks must be clean and free of contamination before a new fuel pump is installed Contaminated fuel is responsible for 50 of the fuel pump product failures Fuel Tank Pressure SensorMonitors fuel tank evaporative pressure for emissions control purposes Fuel Filler CapTight seal is critical to proper OBD System operation A loose cap will set the Check Engine light Fuel InjectorsDeliver fuel to engine combustion chambers Fuel Pressure RegulatorControls fuel pressure to fuel injectors Oxygen 02 SensorChecks exhaust gases and sends signal to ECM to adjust fuel mixture for emissions control purposes Fuel FilterProtects injectors and engine from contamination not caught by the fuel pump strainer Important to replace as a part of routine maintenance as well as with any fuel system service Supply and Return LinesDeliver fuel to and from the engine Check for kinks or restrictions Fuel Delivery Systems 407 West Main Street Fairfield IL 62837 Tech Line 1 800 424 7839 2010 Airtex Products LP airtexproducts comAT 6810 F2 TM AIRTEX Fuel System Repair Checklist Fuel system repairs are complex The fuel pump is only one part of a sometimes complicated system Diagnosing fuel delivery problems involves performing several electrical tests as well as pressure and ow tests Airtex is dedicated to delivering the information and tools needed to do the job right Fuel Delivery Systems Fuse and relay Electrical circuits Engine management components Supply and return lines Fuel pressure regulator Fuel injectors Fuel lter Important Things to Remember When Performing a Fuel System Repair Job Inspecting the Complete Fuel Delivery System Ensure all system components are performing properly and avoid misdiagnosis Check fuel system electrical performance Relay and fuse Fuel system voltage Voltage drop tests both positive and negative circuits Check pressure and ow Rest pressure to determine proper check valve operation Key on engine on to measure pressure gauge readings against known vehicle specs P Spend less time on repairs in the long run Installing the Correct P art Reduce comebacks and increase happy customers Check vehicle emissions spec Federal or California Know vehicle wheelbase and tank size Check fuel system identi cation codes GM vehicles Cleaning the Fuel System Avoid contamination and reduce comebacks Inspect and clean the fuel tank ALWAYS change the fuel lter and strainer where applicable Clean the fuel injectors Inspecting and Replacing Related Components Increase customer satisfaction by recommending parts needed to do the job right Replace the fuel lter Check supply and return lines Test the fuel pressure regulator Clean or replace fuel injectors TM
