E-Class T-Model S211 (2003-2009) 2.7L CDI OM 647.961. E-Class T-Model S211 (2004-2009) 2.8L CDI OM 648.961. E-Class T-Model S211 (2003-2009) 3.2L CDI OM 648.961. Fuel Rail Pressure Regulator Valve. Fuel Rail Pressure Regulator Valve (Common Rail Diesel System).