RepairPal Certified shops can diagnose and repair your 1992 Mercedes-Benz 600SEL. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
If you don't have your manual then try following your fuel lines under the car and it should be connected to them. It may be concealed a little by a plate or covering but if you feel around for it you'll find it.