Checking fuel pressure (low pressure): Audi A3 2.0 TDI (CFFA, CFFB, CFGB, CGLA, …)

🧭 Before you start

Remove the engine cover, wrap a cloth round the feed connection and release the supply line from the high-pressure pump. Connect the pressure tester between the supply line and the pump inlet using the adapter. Switch on, select engine electronics, basic setting and the fuel pump check, and run the pump until maximum pressure builds. Then check delivery rate and look over the system for leaks before reconnecting.

Fits: Audi A3 (8P, 2003–2012)

Don't miss

• Release pressure by wrapping a clean cloth round the connection before opening it.
• Keep the open high-pressure pump inlet clean; dirt there goes straight into the injection system.
• Tee the tester into the supply line so the pump still feeds the engine side.
• Check the whole fuel system for leaks once the test is finished.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 51 workshop diagrams for CFFA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Remove engine cover panel .
2. ⚠ Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Release hose clip and detach fuel supply line (arrow) from high-pressure pump.
3. Connect K-Jetronic pressure testerV.A.G 1318 to fuel supply line (1) with suitable adapter (2).
4. Connect second hose (3) (from K-Jetronic pressure testerV.A.G 1318) to open connection on high-pressure pump, as shown in illustration below. [Note: In this way the K-Jetronic pressure testerV.A.G 1318 is connected into the fuel supply line.]
5. Connect a .

6. Switch on ignition.
7. Select "“Engine electronics”" in vehicle self-diagnosis.
8. Then select "“Basic setting”".
9. Select "“Checking fuel system pressurisation pump”" from the list.
10. Press "“Start”" key: The fuel pump will start running.
11. Let fuel pump run until maximum fuel pressure has built up.
12. Check delivery rate of fuel pump . [Note: Check fuel system for leaks.]

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