The DTC code P0313 OBDII states that an engine misfire has been found under low fuel consumption conditions. It is set when the vehicle computer, through sensor signals, determines that the engine failure is due to a poor condition, i.e. too much air and also little fuel.
The solution of this code depends largely on whether other codes are present. For example, if you know that the fuel level is not low, but along with code P0313 there are other codes present related to low fuel pressure, the failure involves the fuel system. For this reason, the causes of P0313 may be more than just low fuel.