Mercedes Benz Workshop Service and Repair Manuals

Fuel Pressure: Specifications

System Pressures:

Cold or Warm ....................................................................................................................................................................... 5.3 - 5.5 bar (77 - 80 psi.)
Residual Pressure, after 30 Min. ....................................................................................................................................................... 2.8 bar (40.5 psi.)

Lower Chamber Pressures: 

Presure specifications given are in bar (psi) below previously measured system pressure.
Normal Operating Temp. .................................................................................................................................................................... 0.4 bar (5.8 psi.)
Idling 68°F (20°C) .............................................................................................................................................................................. 0.4 bar (7.3 psi.)

Enrichment Pressures:

Measured at lower chamber port.
Acceleration Enrichment 20°C (68°F) ......................................................................................................................................... min. 3.8 bar (55 psi.)
Full Load Enrichment (Normal Temp) ................................................................................................................................. approx. 0.4 bar (7.3 psi.) 

Below measured acceleration enrichment pressure.

Deceleration Pressure:

Measured at lower chamber port.
Decel Pressure ..................................................................................................................................................................  Must equal system pressure