Checking fuel pressure regulating valve N276 — AUDI

🧭 Before you start

Remove the engine cover and observe cleanliness rules for fuel work. Detach the return lines at the banjo bolt, plug the open line and connections, fit a hose to the banjo connection into a measuring container and route the other return into a separate container. With fuel temperature above 10 °C, run the engine at idle and measure the return flow. Renew N276 if it is out of specification.

Fits: Audi A5 (8T, 2007–2016), Audi A5 Cabriolet (8F), Audi A4 B8 (8K, 2007–2015)

Don't miss

• Observe the cleanliness rules for fuel system work before and during the test.
• Fuel temperature must be above 10 °C for a valid reading.
• Ignore the injector return; measure only the banjo bolt hose.
• Versions with three return lines need extra plugs on the banjo bolt.
• General practice: renew banjo sealing washers whenever the banjo bolt is disturbed.

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

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ 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. — Remove engine cover panel .
2. Detach fuel return lines (1 and 2) at banjo bolt.
3. Seal off open return line (1) with plug.
4. Seal off open connection at banjo bolt with plug (2).
5. Attach hose (4) to open connection at banjo bolt.

6. Hold hose (4) into a suitable measuring container.
7. Hold return line (3) into a suitable container.
8. Measure return flow rate of hose (4) as follows. [Note: Fuel return rate of injectors from hose (3) can be disregarded for this test.Fuel temperature above 10 °C.]
9. Start the engine and run at idling speed.
10. Renew fuel pressure regulating valve N276.
11. Detach fuel return lines (1, 2 and 3) at banjo bolt.
12. Seal off open return line connection (1) with plug.
13. Seal off open connections at banjo bolt with plugs (arrows).
14. Hold hoses (2 and 3) into a suitable container.
15. Attach hose (4) to open connection at banjo bolt.
16. Hold hose (4) into a suitable measuring container.
17. Measure return flow rate of hose (4) as follows. [Note: Return flow rate from hoses (2 and 3) can be disregarded for this test.]
18. Start the engine and run at idling speed.
19. Renew fuel pressure regulating valve N276.

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