Dismantling and assembling fuel rail with injectors (engine codes BLP and BLF) — AUDI
Dismantling and assembling fuel rail with injectors (engine codes BLP and BLF) on Audi: factory workshop procedure for engines BAG, BLF, BLP.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Dismantling and assembling fuel rail with injectors (engine codes BLP and BLF)
WARNING
Fuel supply line is pressurised. Before loosening fuel connections always release fuel pressure prior to carrying out any work
Chapter
.
On engines with code letters BLP and BLF a fuel pressure limiting valve is incorporated in the fuel filter. In this system, only the supply pipe is routed to the front, to the engine compartment. The fuel pressure limiting valve opens when the pressure in the fuel supply line rises above 6 … 6.8 bar. Excess fuel flows from the filter directly back to the fuel tank via a return line.
1
Bolt
10 Nm
2
Mechanical single-plunger high-pressure pump with
fuel pressure regulating valve
N276
The high-pressure fuel pump should only be removed and installed when the engine is cold.
The fuel system must not be under pressure. For procedure, refer to
Chapter
.
When installing the high-pressure fuel pump, it is essential to ensure that no dirt enters the fuel system.
Install pipes free of tension.
Removing and installing
Chapter
3
Fuel pressure sender for low pressure
G410
Not fitted on models with engine code BLF
Fitting location: in fuel supply pipe
18 Nm
4
Fuel supply pipe
5
Bolt
6
Fuel return pipe
7
Support ring
Make sure it is correctly seated
Via this support ring, the fuel rail exerts the force which holds the injector in the cylinder head.
8
O-ring
Renew
When installing lubricate lightly with clean engine oil
9
Injector
Removing and installing
Chapter
10
Combustion chamber ring seal (teflon ring seal)
Renewing
Chapter
11
Fuel rail (bottom section of intake manifold)
Before removing and installing, lock vacuum unit in position using a 2.5 mm drill
Chapter
.
After installing new bottom section of intake manifold remove clip for vacuum unit.
After installation, check function of intake manifold flap (air flow control flaps) using
hand-operated vacuum pump
VAS 6213
Chapter
Removing and installing
Chapter
12
Union nut
18 Nm
13
High-pressure fuel pipe
14
Bolt
15
Union nut
18 Nm
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.
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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.