In all diesel fuel systems there is a rollover valve which is normally open to atmosphere. In addition to being a nuisance, drivers may miss valid vehicle issues because the check engine light remains on. In the case of many newer vehicles, a gravity fed system keeps the main fuel tank overfull and will likely result in a diagnostic trouble code. However, Transfer Flow believes safety and legality issues can occur with gravity feed auxiliary fuel systems that may violate portions of US DOT regulation 49 CFR 393.67, a requirement of ALL fuel systems.įrom a vehicle performance standpoint, gravity feed fuel systems can adversely affect federally mandated, manufacturer implemented, on-board vehicle diagnostic systems. Due to DOT ambiguity, the absolute legality of gravity fed systems remains unclear. Many state and federal agencies regulate fuel systems, including the US Department of Transportation (DOT), the National Highway Traffic Safety Administration (NHTSA), Code of Federal Regulations (CFR), Federal Motor Vehicle Safety Standards (FMVSS), California Code of Regulations (CCR), and the California Air Resources Board (CARB), to name a few. As a result, Transfer Flow has invested hundreds of thousands of dollars in testing and engineering to be compliant with North American regulatory agencies while maintaining engineering best practices used in the automotive industry. has designed, manufactured, and installed aftermarket and original equipment gasoline and diesel auxiliary fuel systems worldwide since 1983. Transfer Flow’s DOT Special Permit SP-11911 is supplied with every refueling tank, and must be carried aboard each vehicle using a refueling tank.Refueling tanks must be retested every 2 1/2 years in accordance with 49 CFR 180.352.Transfer Flow refueling tanks must be attended to at all times during loading and unloading by a qualified person as described respectively in 49 CFR 177.834 (i), (3), and (4).Refueling tanks are designed to be mounted near the head gate in a pickup box, flat bed or utility box (no other location on the pickup or truck is recommended).The following guidelines must be adhered to when installing and using a Transfer Flow refueling tank: Transfer Flow refueling tanks meet or exceed the testing and certification requirements specified in 49 CFR 178.803. The DOT has issued Transfer Flow DOT Special Permit SP-11911 to manufacture and sell refueling tanks that can store gas, diesel, ethanol, methanol, kerosene and aviation fuel.
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