The EVAP system has three primary operations: storing fuel vapors, purging fuel vapors, and self-monitoring. Storing Fuel Vapors . The vapor canister is the focal point of the EVAP system. When the engine is off, fuel vapors from the gas tank are stored in the canister. Detailed specs and features for the Used 2013 Ford Focus including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more. 1. Hard starting. One of the first symptoms of a potential problem with the fuel rail sensor is hard starting. A faulty fuel rail sensor may send an inaccurate signal to the computer which may cause the engine to experience hard starting. The engine may take a few cranks longer than normal to start and in more serious cases may not start at all. The gas tank on the 2012 Ford Focus is capable of holding 12.4 gallons. Ford has a long history of manufacturing vehicles with strong gas capacity and mileage. Compared to other models in its class, the Focus is one of its more efficient models. Remove the fuel pump module. 1 Rotate the module counterclockwise. 2 Lift the module from the fuel tank. Installation. Note: Install a new fuel pump module seal and make sure it is seated correctly on the fuel tank prior to tightening the locking ring. 1. To install, reverse the removal procedure. 2. See our. Detailed specs and features for the Used 2007 Ford Focus including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more. G8nvG.