The fuel accumulator maintains the pressure in the fuel system for a certain time after the engine has been switched off. When the engine is running it serves to deaden the noise of the electric fuel pump. After the engine has been switched off, the fuel accumulator maintains the pressure in the fuel system in order to facilitate re-starting, particularly when the engine is hot.
Product Details
The design of the accumulator housing is such that it deadens the noise from the fuel pump when the engine is running. The interior of the fuel accumulator is divided into two chambers by means of a diaphragm. One chamber serves as the accumulator volume for the fuel, the other chamber contains a spring. During operation, the accumulator chamber is filled with fuel. This causes the diaphragm to bend back against the force of the spring until it is halted by the stops in the spring chamber. The diaphragm remains in this position, which corresponds to the maximum accumulator volume, as long as the engine is running. When the engine is shut off the spring chamber holds pressure in the fuel system. When the accumulator fails you may hear excessive pump noise and experience "dirty" hot starts after the engine has sat for 5 to 30 minutes.
NOTE: If not recently replaced we also recommend changing the fuel filter and fuel pumps at the same time. Just think how old they are! See related products below for your 6 cylinder fuel delivery kit.
Typical location of the fuel accumulator:
Fits the following models
- MERCEDES BENZ 260E
- MERCEDES BENZ 300CE (1988 and 1989 only)
- MERCEDES BENZ 300E
- MERCEDES BENZ 300SE
- MERCEDES BENZ 300SEL
- MERCEDES BENZ 300TE
- MERCEDES BENZ 400E
- MERCEDES BENZ 500E
- MERCEDES BENZ 190E 2.3
- MERCEDES BENZ 190E 2.3-16
- MERCEDES BENZ 190E 2.6
- MERCEDES BENZ 300E 2.6
- MERCEDES BENZ 300E 4MATIC
- MERCEDES BENZ 300TE 4MATIC