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brake light is prob a bad bulb somewhere , totally seperate from the running problem , get your fuel pressure checked on the fuel rail not sure but should be about 40 50 lbs if not then your fuel pump is prob bad and it is in the tank
Could be a loss of fuel pressure when stopped . fuel pump stop valve letting fuel back to the tank or faulty fuel pressure regulator at the fuel rail letting fuel return to the tank.
It dies after start since not having fuel. There are several factors needed to be checked: 1-Fuel injectors got clogged up or injector module control is having a problem. 2- Not having correct fuel pressure due to fuel filter gets clogged up. 3- Fuel pump is weak not delivering correct rate per spec.
Let the head rule the heart...the S320 diesel. The engines are well built with only the exhaust feed-pipe from the exhaust manifold to the EGR valve needing to be occasionally cleaned out. The Mercedes diesels offer surprisingly good performance, longevity and excellent fuel economy. The S500 is sumptuous but at a cost; the expense is like standing under a shower tearing up bank notes.
BLACK SMOKE IS A RICH FUEL MIXTURE.MERCEDES HAS THE CIS FUEL INJECTION SYSTEM.YOUR PROBLEM COULD BE IN THE DIFFERENTIAL PRESSURE REGULATOR.THE MERCEDES DEALERSHIP WII HAVE TO FIX THEY HAVE TO USE SPECIAL EQUIPMENT TO WORK ON THE FUEL INJECTION SYSTEM.
P1664 FIP (Fuel Injection Pump) malfunction (possible air ingress in low pressure fuel side)
Most likey the Diesel fuel injection pump needs to be replaced or overhauled.
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