Patent ID: 7841317

Claim:
A fuel control system for controlling delivery of a primary and an alternate fuel to an internal combustion engine of a vehicle without cross-contaminating primary and alternate fuel sources with bypassed fuel from the engine, comprising: a primary fuel flow controller that controls delivery of the primary fuel from a primary fuel source to a primary fuel flow path; an alternate fuel flow controller that controls delivery of the alternate fuel from an alternate fuel source to an alternate fuel flow path; an electronic controller coupled to the primary fuel flow controller and the alternate fuel flow controller, wherein the electronic controller is adapted to control the primary fuel flow controller to control delivery of the primary fuel in the primary fuel flow path to a flow cell and control the alternate fuel flow controller to control delivery of the alternate fuel in the alternate fuel flow path to the flow cell; wherein the flow cell comprises: at least one inlet port adapted to receive the primary fuel from the primary fuel flow path and the alternate fuel from the alternate fuel flow path to form an engine supply fuel; an outlet port adapted to supply the engine supply fuel to an engine for consumption; and at least one bypass inlet port adapted to receive excess fuel previously received from the outlet port that was not consumed by the engine, such that the excess fuel is not returned to the primary or alternate fuel sources to avoid cross-contamination of the primary and alternate fuel sources; wherein the electronic controller is further adapted to receive RIN information comprising at least one RIN for the alternate fuel when the alternate fuel is delivered to the alternate fuel source.