S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Connect an assisting hose - arrow - on the Fuel pressure test set (high pressure) and hold in a measuring container.
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Open the pressure gauge shut-off valve.
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Operate Hand held remote control (jumper) to run the fuel pump and slowly close the shut-off valve.
Specified value: 4 bar positive pressure.
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From this point on do not move position of shut-off valve.
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Empty the measuring container.
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Operate Hand held remote control (jumper) to run the fuel pump for 15 seconds.
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Compare the quantity of fuel delivered with minimum delivery rate in diagram (cm3/15 s).
‹› Voltage at fuel pump with engine stopped and pump running is approximate. 2 volts less than battery voltage.
If the minimum delivery quantity is not obtained, check for the following:
‹› Pinched fuel lines.
‹› Clogged fuel filter.
‹› Faulty fuel pump.
Assembly is performed in the reverse order of the removal, note the following: