Friends,
Once again I need his/her help, because I still didn't get to solve the problem of fuel of my C280.

I summarize of the problem:

Whenever the vehicle reaches 1/4 of fuel in the tank, it suffers a breakdown and the car doesn't work more.
In case it insists on the start, he still catches an or twice, he/she walks 1km approximately and later it doesn't diffuse more.
When emptying the tank, I noticed that the gasoline is whole beside the passenger, same side that the bomb pulls the fuel, but even so he only works if it puts more than 1/4 of the gasoline.

Verified:
- I went to the mechanic and we measured the pressure of the bomb of fuel, it measured among 4,5 to 5kg of force (I believe that normal);
- We verified the two fuel level sending. includes with pump, and both are perfect, besides transferring the fuel to and fro;
- No hose is obstructed;
- Did we notice that it exists to the bottom of the tank beside the passenger another reservoir, but didn't we get to reach him/it, what does have for there? would the suction of fuel the gasoline be?

Help:
Could anybody explain how step works the step the system of the tank of fuel of that car? What will be that it is happening?

Please, I need a help.

Mercedes-Benz C280 95 WDBHA28W9SF224113

Thank you.

Carlos Eduardo
Brazil