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Along with the Aeromotive pump and filters, Rick's also uses an Aeromotive 13109 bypass regulator. Just like all fuel systems, fuel injected motors can only handle so much fuel at a time. Once the fuel rails fill up with gas, the excess fuel being pumped to the rails is directly sent back to the tank. When using a bypass regulator, it measures the pressure in the system and only delivers the proper amount of fuel needed to the motor.