A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Fuel Pressure Release: Service and Repair
Procedure That Must Be Performed Before Opening The High-pressure Fuel Injection System - Pay Close Attention
For safety reasons, if the battery is not disconnected, fuse - 28 - from the Fuel Pump (FP) Control Module J538 must be removed before opening fuel
system. Otherwise, the fuel pump will be activated by the drivers door contact switch.
NOTE:
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The fuse is located in the fuse carrier in the instrument panel.
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By removing fuse - 28 -, the voltage supply to terminal 30 for the Fuel Pump (FP) Control Module J538 is interrupted.
CAUTION:
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The fuel injection system is divided into a high pressure section (maximum approx. 110 bar) and a low pressure system (approx. 6 bar).
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Before opening high pressure parts, e.g. removing high pressure pump, fuel rail, fuel injectors, fuel pipes or Fuel Pressure Sensor G247
G247 , fuel pressure in high pressure area must be reduced to a residual pressure of approx. 6 bar. The procedure for this is as follows.
High fuel pressure, reducing
Special tools, testers and auxiliary items required
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Assembly tool T10118
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Remove electrical connector - 2 - from Fuel Pressure Regulator Valve N276 using the Assembly Tool T10118 . T10118
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Allow engine to idle approx. 10 seconds.
NOTE:
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By removing the electrical connector from the Fuel Pressure Regulator Valve N276 in idle, the fuel pressure is reduced from approx. 50 bar to