Removing and installing tandem pump and fuel pump, engine code AJS — VW

🧭 Before you start

Fits: VW Phaeton (3D)

• Renewed: tandem pump seals

Don't miss

• Ensure that tandem pump coupling seats properly in camshaft.Always renew tandem pump seals.
• Disconnecting the central connector for unit injectors causes faults to be stored. Therefore, read event memory and delete if necessary.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ The tandem pump may, under no circumstances, be dismantled as the vacuum part could otherwise malfunction. This would result in the failure of the brake booster. — Remove fuel filter .
2. Remove intake manifold 23.
3. Detach vacuum line (1) of brake booster from tandem pump (5).
4. Pull off central connector for unit injectors (3).
5. Pull fuel hose (2) off tandem pump (5).

6. Unscrew securing bolts (arrows).
7. Remove tandem pump (5) from cylinder head.
8. Pull tandem pump (5) upwards slightly.
9. Pull off fuel hose (4), and remove tandem pump. [Note: Ensure that tandem pump coupling seats properly in camshaft.Always renew tandem pump seals.]
10. Connect fuel line (4) together with new seals to tandem pump (5).
11. Tighten banjo bolt to 25 Nm. — 25 Nm (18 lb-ft)
12. Install tandem pump, and tighten securing bolts (arrows) to specified torque.
13. Attach fuel hose (2) and vacuum hose (1) to tandem pump.
14. Connect central connector for unit injectors.
15. Install fuel filter .
16. Install intake manifold 23.
17. Carry out road test and read all event memories. [Note: Disconnecting the central connector for unit injectors causes faults to be stored. Therefore, read event memory and delete if necessary.]

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