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Rush SR Service Manual
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    Fuel Tanks

    Several fuel systems have been fitted across the fleet. Which one you have decides what you are eligible to enter, which bulletins apply to you, and how much to trust the fuel level reading.

    The 6-gallon cockpit cell

    Section titled “The 6-gallon cockpit cell”

    The current system, and the one to be on.

    The installation procedures bulletin ties it to NASA, SCCA and SVRA competition in 2026, and a behind-seat tank is among the 2027 mandates in Section 15 of the technical regulations. Read the bulletin and your series’ rules together before you enter, rather than taking either as the whole answer.

    The 12-gallon endurance cell

    Section titled “The 12-gallon endurance cell”

    For long-format racing. Two bulletins apply, and the first is not optional reading:

    It uses a different fuel level sender and calibration curve from the 6-gallon cell. See Installing a Fuel Level Sender.

    The 5-gallon ATL system (discontinued)

    Section titled “The 5-gallon ATL system (discontinued)”

    The older cars ran an ATL FIA FT3 5-gallon rotary-molded tank. It is no longer sold, along with its retainer strap, combined pump and filter assembly, regulator, and suction booster kit, so a failure means a system change rather than a part.

    It is also not eligible in many sanctioning bodies. Between that, the 2026 bulletin above and the 2027 behind-seat mandate, plan the change rather than waiting to be turned away at tech.

    Two service details differ from the current cell while you still have it: the fuel filter is an inline unit in the feed line rather than inside the tank enclosure, and fuel pressure is read from an inline gauge in the engine bay rather than off the dash. See Cleaning the Fuel Filter and Checking Fuel Pressure.

    Dual tank cars

    Section titled “Dual tank cars”

    The RAW FIA Dual Tank Fuel System is an option some cars carry.

    Service life

    Section titled “Service life”

    The fuel cell must be replaced every 5 years, regardless of how it looks. That rule is stated under Warnings Before First Drive.

    The cell foam is replaced every 2 years, on the long-term maintenance schedule. Inspect it for deterioration between changes rather than waiting for the interval.

    Your sanctioning body may require shorter intervals than either. Take whichever is stricter. Certification dates are a routine tech item and easy to forget on a car that is otherwise ready.