BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Fuel Pressure Regulator

Print

REMOVAL & INSTALLATION



M20 AND M30 Engines
  1. The fuel pressure regulator is mounted on the end of the fuel rail and has a vacuum line and a fuel line leading to it.
  2.  
  3. Relieve the fuel pressure. Disconnect the fuel hose and the vacuum hose.
  4.  
  5. Remove the 2 bolts holding the regulator to the fuel rail. Pull the regulator off the fuel rail.
  6.  

To install:
  1. Inspect the O-ring on the fuel rail inlet of the regulator. Install the regulator on the fuel rail and tighten the bolts.
  2.  
  3. Connect the fuel hose and vacuum hose.
  4.  

M42 Engine
MOUNTED IN E30 CHASSIS
  1. Remove the front intake manifold support brace.
  2.  
  3. Disconnect the vacuum hose from the regulator. Loosen the mounting clamp bolt and remove the clamp.
  4.  
  5. Be ready to catch the fuel that will leak out of the fuel rail. Pull the regulator down and out of the fuel rail.
  6.  

To install:
  1. Inspect the O-ring on the fuel rail inlet of the regulator. Install the regulator on the fuel rail and mount the clamp. Tighten the bolts.
  2.  
  3. Connect the fuel hose and vacuum hose. Install the front manifold brace.
  4.  

MOUNTED IN E36 CHASSIS

See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Remove the front brace to access the fuel pressure regulator-M42 engine



Click image to see an enlarged view

Fig. Fig. 2: Remove the bolt to remove the fuel pressure regulator-M42 engine

  1. Remove the front intake manifold support brace.
  2.  
  3. Disconnect the vacuum hose from the regulator. Loosen the mounting bracket bolt and remove the bracket.
  4.  
  5. Be ready to catch the fuel that will leak out of the fuel rail. Pull the regulator out of the fuel rail.
  6.  

To install:
  1. Inspect the O-ring on the fuel rail inlet of the regulator. Install the regulator on the fuel rail and mount the bracket. Tighten the bolt.
  2.  
  3. Connect the fuel hose and vacuum hose. Install the front manifold brace.
  4.  

M50 Engine

See Figures 3 and 4



Click image to see an enlarged view

Fig. Fig. 3: Remove the clamp to release the fuel pressure regulator-M50 engine



Click image to see an enlarged view

Fig. Fig. 4: Check the condition of the fuel pressure regulator O-rings before installation

  1. On the E36 3 Series with this engine, remove the DME module housing cover screws on the right side of the firewall. Remove the rubber strips along the wire duct by pulling up. Remove the screws from the wire duct and pull it out. This will allow enough movement in the injector wires to remove the injector electrical plug plate.
  2.  
  3. Remove the oil filler cap and the valve cover cladding. Remove the injector area cover.
  4.  
  5. Disconnect the fuel feed at the front of the fuel rail. Remove the 2 screws holding the injector electrical plug plate. Pull up and remove from the injectors.
  6.  
  7. Disconnect the fuel return line. Remove the 2 bolts holding the fuel rail and remove the fuel rail by pulling off with the injectors. Remove the clamp holding the regulator and remove from the fuel rail.
  8.  

To install:
  1. Check the O-rings on the regulator and replace if necessary. Install on the fuel rail.
  2.  
  3. Install the fuel rail and tighten the bolts to 6.5-8.0 ft. lbs. (9-11 Nm). Connect the fuel lines. Install the electrical plug plate. Connect the vacuum hose to the regulator.
  4.  
  5. Install the fuel rail cover and the valve cover cladding with the oil filler cap. Install the wire duct and the rubber stripping.
  6.  

S14 Engines
  1. The fuel pressure regulator is mounted on the end of the fuel rail and has a vacuum line and a fuel line leading to it.
  2.  
  3. Relieve the fuel pressure. Disconnect the fuel hose and the vacuum hose.
  4.  
  5. Remove the 2 bolts holding the regulator to the fuel rail. Pull the regulator off the fuel rail.
  6.  

To install:
  1. Inspect the O-ring on the fuel rail inlet of the regulator. Install the regulator on the fuel rail and tighten the bolts.
  2.  
  3. Connect the fuel hose and vacuum hose.
  4.  

S38 Engines
  1. The fuel pressure regulator is mounted on the end of the fuel rail and has a vacuum line and a fuel line leading to it.
  2.  
  3. Relieve the fuel pressure. Disconnect the fuel hose and the vacuum hose.
  4.  
  5. Remove the clamp bolt holding the regulator to the fuel rail. Remove the clamp and pull the regulator off the fuel rail.
  6.  

To install:
  1. Inspect the O-ring on the fuel rail inlet of the regulator. Install the regulator with clamp on the fuel rail and tighten the bolt.
  2.  
  3. Connect the fuel hose and vacuum hose.
  4.  

 
label.common.footer.alt.autozoneLogo