The disclosure includes a fuel pump control system for saddle fuel tanks. A vehicle includes a fuel tank, a jet pump and a controller. The fuel tank has a passive side and an active side. Each of thesides includes a fuel level indicator. The jet pump is disposed within the active side and is configured to maintain a fuel level above a first threshold, based on each of the indicators, on the active side by siphoning fuel from the passive side during operation in a combustion mode. The controller is configured to, in response a battery charge level being below a second threshold during operation in an electric mode and a detected hill climb via a route guidance system, activate the jet pump to siphon fuel such that a fuel level within the active side rises above the first threshold.