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Here is some more information regarding the Transfer Flow fuel tank systems.


In the aftermarket fuel tank system industry, there is a lot of confusion over what is “legal” when adding or replacing a fuel tank. We hope the following information helps clear up some of these very important concerns. Be advised that this information is not intended to be a complete list, but rather a general overview.

For Vehicles Less Than 10,000 GVW
TFI fuel systems meet FMVSS 301 (Federal Motor Vehicle Safety Standards), VESC-22 (Vehicle Equipment Safety Commission), NFPA 1192, ANSI 119.2, RVIA (Recreational Vehicle Industry Association) regulations, CARB (California Air Resources Board), and EPA (Environmental Protection Agency) regulations. FMVSS 301 states that anyone who alters a vehicle must meet or exceed the structural integrity and performance of the OEM (Original Equipment Manufacturer) fuel system. A fuel system includes anything associated with fuel systems such as the fillneck, tank, gasoline lines, fuel pump, emission canister and fasteners.

In other words, if an alterer adds an auxiliary system to a vehicle thereby reducing the performance of the fuel system, he or she has violated FMVSS 301 standards. An example of performance reduction could be if fuel from the original system leaked because the auxiliary system was gravity feeding into the original tank. This creates a real concern as it not only violates FMVSS 301 regulations, but is also a hazardous waste problem.

TFI’s inboard chassis frame and in-bed tank systems meet and exceed the OEM systems in the following areas:
1.TFI tanks are designed using 14-gauge aluminized steel as a minimum instead of the 22 gauge terneplate or plastic that OEM typically uses. Transfer Flow’s aluminum diamond plate in-bed tanks are made from 1/8” thick aluminum.

2.TFI tanks are fully baffled unlike OEM tanks which have no baffles.

3. At a minimum, TFI tanks are drop tested in accordance with VESC-22. When drop tested, they are fully filled with water and cannot leak. Many of TFI’s fuel systems are also crash tested to FMVSS 301 standards.

4. Tanks are 100% pressure tested using a sophisticated automatic Helium testing machine. This machine is capable of finding leaks with a helium concentration of less that 1.00E-7 liters/sec (leak size of 0.0000000315 in-sq or 3.15 E-8 in-sq).

5. TFI tank systems meet the fastener (strap) regulations specified by ANSI, NFPA, and required by RVIA (Recreation Vehicle Industry Association).

6. TFI systems meet CARB and EPA emissions regulations. We design our systems with the correct emission canister capacity necessary for gasoline applications. GM, Ford, Dodge, etc. all use different canisters with different absorption characteristics. Each TFI fuel system is designed to be compatible with that vehicle’s emissions system.

7. TFI fillneck designs meet CARB fuel fill regulations. We design our fillnecks with proper alpha and beta angles and correct inclination angles for gasoline and diesel applications.

8. TFI systems meet CARB and EPA requirements concerning fuel fill rates. This test verifies that our system fills at a minimum of 10 gallons per minute - a rate equal to that dispensed at most gas stations.