Fuel system

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  • Does "FSI" stand for "Fuel Stratified Injection" or "Fuel Straight Injection"?
    • "While in some markets this design permits Audi to substantially lean out the mixture – direct injection allows the creation of a fuel-rich "stratified charge" near the spark plug – North America's fuel quality and emissions standards preclude taking maximum advantage of that capability, so Audi calls our version of FSI "Fuel Straight Injection" Canadian Driver magazine, Nov 30, 2005
      (Article also saved here.)
    • "Although FSI does allow engines to run lean air-to-fuel ratios—thus saving fuel—there is a side effect of increased production of NOx. There are catalytic converters that can remove the extra NOx, but the high-sulfur fuel we use in the U.S. contaminates them. There are Audi engines in Europe—including racing powerplants—that use FSI with lean burn, but here, FSI engines run about the same air-to-fuel ratio as port-injected engines. So for us, FSI is short for "fuel straight injection." Car & Driver magazine, Dec 2004.
      (Article also saved here: page 1 & page 2.)
  • Chart of fuel flow rate of 'B' fuel rail pump: 06F127025B flow.gif
  • Chart of fuel flow rate of 'F' fuel rail pump: 06F127025F flow.gif
  • Pic of fuel rail pump from a 2007 GTI DSG, showing 'H' designation [vwvortex]:



  • One way to drain the fuel tank [vwvortex]: There is a return line from the fuel filter to the fuel pump housing. Lift up the rear seat bench. Pop out the cover for the fuel pump. Disconnect the return line and run it into a container.