Daily Monitor My car does not pump fuel properly Hello Paul, my Mercedes Benz 230E does not pump fuel properly. Even if there is enough fuel, at times it behaves as if it has run out. What could be the problem? Lydia Hello Lydia, it is always useful to start with the basics. Have you replaced your fuel filter since your car’s fuel system started failing? If you haven’t, it may have damaged your fuel pump. However, before you replace the fuel pump, make sure the fuel lines from the pump are not damaged or leaking. A computer diagnosis does not harm, to confirm that an engine management sensor like the crank angle sensor is not faulty.