Checking supplementary fuel pump V393 or fuel pump 2V277 (Inline EFP), engine code CFFB — VW

🧭 Before you start

Fits: platform codes 5C7, 5C1

• Special tools named: VAS 6551

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• The fuel pump is now activated for 30 seconds.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Read rules for cleanliness and the instructions for working on the fuel system .Observe safety instructions .Always follow these instructions and rules for cleanliness before and during work . — Remove engine cover 10Engine cover; Removing and installing engine cover.
2. Pull engine cover upwards in areas of (arrows) and in sequence shown.
3. To do this, grip beneath engine cover as far as possible.
4. ⚠ Bracket for engine cover on cylinder head cover may break off if removed improperly. Remove engine cover according to following instructions under all circumstances. — Open clamp and pull fuel supply line (arrow) off the high-pressure pump.
5. ⚠ Fuel supply line may be pressurised. Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Place connecting nippleVAS 6551/5-1 in supply line and secure with clamp.

6. Connect hoseVAS 6551/2 between connecting nippleVAS 6551/5-1 and connection point »A« of pressure tester (diesel)VAS 6551.
7. Connect hoseVAS 6551/5-2 to connection point »B« of pressure tester (diesel)VAS 6551 and high-pressure pump. Secure to high-pressure pump with a clip.
8. Switch on pressure testerVAS 6551 by pressing On/Off button.
9. Open shut-off taps (A) and (B) of pressure testerVAS 6551.
10. Close shut-off valve (C).
11. Connect Vehicle diagnosis tester and then carry out "„Guided Fault Finding, Checking electrical fuel pump(s)“". [Note: The fuel pump is now activated for 30 seconds.]
12. Check fuel pressure on fuel system pressurisation pump G6.
13. Check fuel delivery rate on fuel system pressurisation pump G6.
14. Renew supplementary fuel pump V393 or fuel pump 2V277.

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