Checking delivery rate of supplementary fuel pump V393 — AUDI
Checking delivery rate of supplementary fuel pump V393 on Audi: factory workshop procedure for engines ASB, BLB, BMK, BNA.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📐 20 workshop diagrams for ASB
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Checking delivery rate of
supplementary fuel pump
V393
Special tools and workshop equipment required
Vehicle diagnostic, testing and information system, e.g.
vehicle diagnostic, testing and information system
VAS 5051B
Fuel-resistant hose with inner ∅ of 8 mm
Fuel-resistant measuring container
Procedure
Fuel system pressurisation pump
G6
okay: vehicles with front-wheel drive
Chapter
; vehicles with four-wheel drive
Chapter
.
Observe test conditions
Chapter
.
Observe rules for cleanliness
Chapter
.
WARNING
Risk of injury - fuel system operates under pressure.
Wrap a clean cloth around the connection before opening the fuel system. Then release pressure by carefully loosening the connection.
Wear protective gloves.
Wear safety goggles.
The fuel can become extremely hot. This can cause injuries.
In extreme cases the temperature of the fuel lines and the fuel can be up to 100 °C after the engine is switched off. Allow the fuel to cool down before disconnecting the lines - danger of scalding.
Wear protective gloves.
Wear safety goggles.
Vehicles with engine codes CAGB, CAHA:
Detach fuel supply hose
1
from fuel tank (at fuel filter).
Lengthen fuel supply hose with an auxiliary hose
arrow
and hold end of hose in measuring container.
Vehicles with engine codes CANA, CANB, CANC, CAND, CDYA, CDYB, CDYC:
Detach fuel supply hose
1
from fuel tank (at fuel filter).
Lengthen fuel supply hose with an auxiliary hose
arrow
and hold end of hose in measuring container.
All vehicles (continued):
Connect vehicle diagnostic, testing and information system (e.g.
vehicle diagnostic, testing and information system
VAS 5051B
) and switch on ignition.
Start vehicle self-diagnosis
Self-diagnosis
01 - Engine electronics
Basic setting
Select test for fuel system pressurisation pump or display no. 35
Press
Parameter
key.
Press
Start
key and after 15 seconds press
Stop
key.
Measure fuel delivery rate in measuring container.
Specification: approx. 1 litre at battery voltage of at least 12.5 V.
If minimum delivery rate is not reached, check for the following causes:
Fuel lines have been crushed.
Fuel filter is blocked.
Fuel pump is defective.
Installation is carried out in the reverse order; note the following:
Note
Secure all hose connections with the correct type of hose clips (same as original equipment)
Electronic parts catalogue
.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
Ask about my car →Other AUDI procedures
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- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.