Checking delivery rate of both fuel pumps — VW

🧭 Before you start

Fits: VW Phaeton (3D)

• Special tools named: V.A.G 1318/17, V.A.G 1318/16, V.A.G 1318/11
• Renewed: fuel filter

Don't miss

• Push in button on hose coupling to do this.
• Operate remote controlV.A.G 1348/3A. Then slowly close shut-off tap until a pressure of 4 bar is displayed on pressure gauge. From this point on do not move position of shut-off tap.
• Press buttons on hose couplings to do this.

🔧 Engine codes this applies to

📋 Procedure

1. Remove filler cap from fuel tank filler neck.
2. Remove intake hose between air mass meter G70 and throttle valve module J338.
3. ⚠ Fuel supply lines are under pressure! Wear eye protection and gloves to avoid injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Pull off supply hose (1) from supply line (2) and collect fuel that leaks out with a cloth. [Note: Push in button on hose coupling to do this.]
4. Connect pressure gaugeV.A.G 1318 with adapterV.A.G 1318/23 and V.A.G 1318/17 to fuel supply line.
5. Push hose V.A.G 1318/16 onto adapter V.A.G 1318/11 of pressure gauge and hold hose in a measuring container.

6. Open pressure tester shut-off tap. The lever then points in the direction of flow.
7. Connect remote controlV.A.G 1348/3 A using adapterV.A.G 1348/3-3 to connections of fuel pump relay (2) and (3).
8. Connect positive terminal (1) of remote control to positive pole in engine compartment.
9. Operate remote controlV.A.G 1348/3A. Then slowly close shut-off tap until a pressure of 4 bar is displayed on pressure gauge. From this point on do not move position of shut-off tap.
10. Empty measuring container.
11. The delivery rate of the fuel pumps depends on the battery voltage. Therefore connect the multimeter with auxiliary cables from auxiliary measuring setV.A.G 1594C to the left vehicle battery.
12. Operate remote control for 30 seconds while measuring battery voltage.
13. Compare quantity of fuel delivered with specification.
14. Check current draw of fuel pumps .
15. Check fuel lines for possible restrictions (kinks) or blockages.
16. Pull supply line (1) off inlet to fuel filter. [Note: Press buttons on hose couplings to do this.]
17. Connect pressure gaugeV.A.G 1318 with adapter setV.A.G 1318/17 to hose.
18. Repeat delivery rate check.
19. Renew fuel filter.

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