FREQUENTLY ASKED
QUESTIONS
FREQUENTLY ASKED
QUESTIONS
 INSTALLATION & SETUP
 INSTALLATION & SETUP
A: Most FiTech EFI systems require a return-style fuel system. However, our Force Fuel and In-Tank Modules simplify this
by converting a return system into a returnless configuration at the tank.
Q: DO I NEED A RETURN FUEL LINE FOR YOUR EFI SYSTEMS?
Q: DO I NEED A RETURN FUEL LINE FOR YOUR EFI SYSTEMS?
EVERYTHING YOU NEED TO KNOW BEFORE AND AFTER YOUR PURCHASE.
EVERYTHING YOU NEED TO KNOW BEFORE AND AFTER YOUR PURCHASE.
A: All systems include a full wiring harness and detailed instructions. Power, ground, switched ignition, and fuel pump
control wires are clearly marked. For advanced setups, timing control and fan relays are also available.
Q: HOW DO I WIRE THE FITECH SYSTEM INTO MY VEHICLE?
Q: HOW DO I WIRE THE FITECH SYSTEM INTO MY VEHICLE?
A:  You can use your original tank, but it must be converted for EFI use. FiTech recommends upgrading to an EFI-ready
fuel tank or retrofitting your existing setup with a high-pressure in-tank pump and proper return line. We offer complete fuel
delivery solutions that work with both carbureted and EFI conversions.
Q: CAN I USE MY STOCK FUEL TANK?
Q: CAN I USE MY STOCK FUEL TANK?
PRODUCT COMPATIBILITY
PRODUCT COMPATIBILITY
A: Our horsepower ratings are based on fuel injector size, fuel pump capacity, and overall system design. Each system is
matched to support a specific horsepower range using industry-standard calculations and real-world testing. For example,
injector flow rate (in lb/hr), fuel pressure, and BSFC (Brake Specific Fuel Consumption) are factored in to determine how
much horsepower the system can support safely and efficiently. We also test systems on the dyno to confirm performance
and drivability under real-world conditions. Currently, all catalog-listed horsepower ratings are based on gasoline. If running
E85, the actual supported horsepower will be lower.
Q: HOW IS THE SYSTEM HORSEPOWER DETERMINED?
Q: HOW IS THE SYSTEM HORSEPOWER DETERMINED?
A: Yes. Many of our systems are boost-capable right out of the box, including our Power Adder Throttle Body Systems,
Ultimate LS kits, and more. Just ensure proper fuel delivery and sensor setup.
Q: CAN I RUN YOUR EFI WITH A SUPERCHARGER OR TURBO?
Q: CAN I RUN YOUR EFI WITH A SUPERCHARGER OR TURBO?
A:  FiTech EFI systems are compatible with gasoline and E10 pump fuel out of the box. Many systems can also support
E85, but this requires larger injectors and an E85-compatible fuel system, including proper fuel lines, pump, and filter. Keep
in mind that E85 requires more fuel volume than gasoline to produce the same power, so horsepower capability may be
reduced if the fuel system is not upgraded accordingly.
Q: WHAT KIND OF FUEL CAN I USE?
Q: WHAT KIND OF FUEL CAN I USE?
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