Checking fuel pressure of fuel pump: Audi Q5 (CAGA, CAGB, CAHA, CAHB, …)

🧭 Before you start

Fits: Audi Q5 (8R, 2008–2017)

• Special tools named: VAS 6551, VAS 6551/5

Don't miss

• Disregard (item 2).
• Disregard (items 1, 3).
• In this way the pressure tester (diesel)VAS 6551 is connected into the fuel supply line.
• Risk of fuel escaping.Make sure that drain tap (C) is closed.The lever should point perpendicular to direction of flow. — Open cut-off valves (A and B).
• Check fuel system for leaks.

🔧 Engine codes this applies to

📐 38 workshop diagrams for CAGA

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

📋 Procedure

1. ⚠ Observe rules for cleanliness when working on the injection system . — Disconnect fuel supply hose (1). [Note: Disregard (item 2).]
2. Disconnect fuel supply hose (2). [Note: Disregard (items 1, 3).]
3. Attach connection leadVAS 6551/5-2 to fuel supply line (1) and secure with hose clip.
4. Attach connection fittingVAS 6551/5-1 to fuel supply hose (2), secure with hose clip and attach connection leadVAS 6551/5-4.
5. Connect pressure tester (diesel)VAS 6551 to fuel supply hose with connection leadsVAS 6551/5-2, VAS 6551/5-3 and VAS 6551/5-4. [Note: In this way the pressure tester (diesel)VAS 6551 is connected into the fuel supply line.]

6. Connect pressure tester (diesel)VAS 6551 to fuel supply hose with connection leadsVAS 6551/5-2, VAS 6551/5-3 and VAS 6551/5-4. [Note: In this way the pressure tester (diesel)VAS 6551 is connected into the fuel supply line.]
7. ⚠ Risk of fuel escaping.Make sure that drain tap (C) is closed.The lever should point perpendicular to direction of flow. — Open cut-off valves (A and B).
8. Connect vehicle diagnostic tester.
9. Switch on the ignition and select the following menu options on the vehicle diagnostic tester:
10. Press Start: The fuel pump will start running.
11. Let fuel pump run until maximum fuel pressure has built up.
12. Checking delivery rate of fuel system pressurisation pump G6.
13. 4-cylinder and 6-cylinder engines (generation I): also check delivery rate of supplementary fuel pump V393. [Note: Check fuel system for leaks.]

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