Fuel Pump (FP) delivery rate, checking

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Battery Positive Voltage (B+) supply OK
VAG 1348/3A remote control connected

Remove fuel cap.
Disconnect fuel supply line -1- from fuel rail.

WARNING: Fuel will be expelled. For protection against fuel spray, cover connections with a cloth.

Connect VAG 1318 pressure gauge to fuel supply hose - 1- using VAG 1318/10 adapter.

Fig 1: Connecting Pressure Gauge To Fuel Supply Hose
Push VAG 1318/1 hose onto VAG 1318/11 pressure gauge adapter and hold in measuring container.
Open fuel gauge shut-off valve (lever in direction of flow -A-).
Operate VAG 1348/3A remote control and slowly close shut -off valve, until gauge reads 4 bar (58 psi). Leave valve in this position (closed).
Empty measuring container.
Operate remote control for 30 seconds.
Compare amount of fuel delivered with specification.

Fig 2: Fuel Delivery Specification Graph

NOTE: The following asterisk footnotes refer to graph in Fig 2 .

*) Minimum fuel delivery - cm³ /30 seconds

**) Voltage at Fuel Pump with engine stationary and pump running (approx. 2 volts less than battery voltage).

If minimum fuel quantity is not delivered, check for the following causes:

Fuel lines kinked or plugged
Fuel filter plugged - Replace fuel filter.
Fuel Pump malfunctioning - Replace Fuel Pump Module. See FUEL PUMP (FP) MODULE, REMOVING AND INSTALLING .