PeachParts Mercedes-Benz Forum - View Single Post

tinypanzer · #2 09-25-2009, 11:23 PM

Hi there.... Funny, I'm sort of in the same boat as you at the moment. Here's what little I know about these fuel systems. First, I don't think there's a check valve per se, but there is an "accumulator", which is a spring loaded diaphragm deal that stores fuel pressure. It is located above the fuel pump. If the diaphragm tears, then the pressure can leak down when the car is stopped.

You want to do a fuel pressure test, to make sure pressure is normal and is being held when the car is off.

If you notice a leaking down of pressure with the car off, then there is a leak somewhere. That could be the accumulator, the injectors, the fuel distributor or a fuel line. The accumulator can be made to not leak without removal by pinching off the return line to the tank. A temporary way to see if the diaphragm is torn by comparing symptoms before and after.....

It sounds like fuel is leaking into your cylinders when you turn the car off, causing a temporary flood condition.

Also, make sure your air meter flap is not sticking.