1994 Audi S4FACTORY OEM SERVICE PROCEDURE

Fuel Pump Feed Rate

/3A) using adapter lead (VW 1348/3-2) and adapter cables from (VW 1594) between fuse No. 17, terminal No. 2, and battery positive (+) terminal. On vehicles with A/C, connect clip to remote starter aid connection in engine compartment. See Figure. NOTE: Place a cloth under and around area where hose will be connected to fuel line to catch residual fuel. Fig 1: Identifying Fuel Supply Line In Engine Compartment [IMAGE: http://127.0.0.1:8080/images25/G00177381/] Courtesy of AUDI OF AMERICA, INC. Disconnect fuel supply line from fuel pump. See Fig 1. Attach hose to fuel supply line, place other end of hose into a measuring glass. See Fig 2. Operate remote control (VW 1348/3A) for 15 seconds (hold down button). Record amount of fuel deposited into measuring glass. Compare measured quantity with specified values for minimum feed rate in graph. See Fig 3.Fuel delivery is dependent on battery voltage. Fig 2: Identifying Fuel Feed Rate Test Set-up [IMAGE: http://127.0.0.1:8080/images25/G00177382/] Courtesy of AUDI OF AMERICA, INC. Fig 3: Fuel Pump Feed Rate Specification Graph [IMAGE: http://127.0.0.1:8080/images25/G00177380/] Courtesy of AUDI OF AMERICA, INC.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.