Fuel Pressure Regulator Valve -N276-

WARNING: This page is about a different car, the 2010 Volkswagen Jetta and 2009 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Function

The fuel pressure regulator valve is located in the fuel rail and maintains a constant pressure in the fuel rail and in the high pressure lines (high pressure fuel circuit).

If the pressure in the high pressure fuel circuit is too high, the fuel pressure regulator valve opens so a portion of the fuel leaves the fuel rail through the return line and goes back into the fuel tank.

If the pressure in the high pressure fuel circuit is too low, the fuel pressure regulator valve closes and seals the high pressure side from the low pressure side.

Special tools and workshop equipment required

Torque Wrench (40-200 Nm) V.A.G 1332

CAUTION:

Follow the safety precautions when working on the diesel direct injection system. Refer to SAFETY PRECAUTIONS .
Observe the rules for cleanliness. Refer to CLEAN WORKING CONDITIONS .

Always follow these instructions before and during work.

Removing

-- Remove the engine cover. refer to ENGINE COVER .

-- Before removing, clean the threaded area around the fuel pressure regulator valve (for example using a commercially available detergent). Contamination must not enter the bore in the fuel rail.

NOTE:

Clean carefully, the cleaner must not enter the connector.

The fuel pressure regulator valve cannot be reused again.

-- Dry the fuel pressure regulator valve.

-- Disconnect the connector -arrow- from the fuel pressure regulator valve.

Fig 1: Identifying Connector Disconnected From Fuel Pressure Regulator Valve

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Counter-hold the valve housing hex and loosen the valve nut. Then remove it by hand.

-- Extract any contamination from the fuel rail bore (threads and sealing surface). Do not use mechanical tools.

NOTE:

Seal the fuel rail bore immediately with a suitable plug to prevent contaminants from entering.

Installing

NOTE:

Check the fuel pressure regulator valve sealing surface and threads for damage.

Check the sealing surface in the fuel rail bore.

The threads on the new fuel pressure regulator valve must be free of oil and grease.

-- First, tighten the valve nut for the fuel pressure regulator valve by hand.

-- Align the fuel pressure regulator valve so the connector wire is not taut after connecting the connector.

-- Counter-hold at the valve housing hex and tighten the nut:

Tightening specification, see -item 6- in the FUEL RAIL AND INJECTORS OVERVIEW .

-- After installing, allow the engine run at a moderate speed for a few minutes and then it off.

-- Check the fuel system for leaks. Refer to FUEL SYSTEM, LEAK TEST .

-- Read the Engine Control Module (ECM) Diagnostic Trouble Code (DTC) memory again. Refer to "Guided Functions" in the vehicle diagnostic tester.

-- Install the engine cover. Refer to ENGINE COVER .