Radium FSTR RA Fuel Surge Tank w/Integrated FPR Fuel Pressure RegulatorFSTR RA A fuel surge tank is designed to prevent starvation to the engine on vehicles with inadequate fuel tank baffling. The surge tank pump feeds the fuel rail(s). The volume of fuel inside acts as a buffer to always keep the fuel surge tank pump supplied. This volume is maintained by the main fuel tank's (lift) pump as well as the fuel returning from the fuel pressure regulator. In the case of the FSTR RA (fuel surge tank regulated rotating