A module for measuring the flow rate of fuel having: - an inlet portion and an outlet portion and a primary conduit for transporting the fuel extending between said inlet and outlet portions for transporting a first flow (F1) of fuel; said primary conduit being defined in a main body of the module ; - a secondary conduit for transporting fuel, adjacent to said primary conduit and extending between a first section and a second section of said primary conduit and arranged in fluid communication with the latter for transporting a second flow (F2) of fuel between said first and second section , the secondary conduit being parallel to the primary conduit and being defined in a peripheral portion to the central portion of the main body ; further the secondary conduit being defined in a portion of said main body radially distanced from the primary conduit ; - a sensor for measuring the flow rate of fuel introduced into said secondary conduit ; said sensor being configured to be installed through a cavity of the main body so as to be able to reach the secondary conduit and the second flow (F2) of fuel; - a Venturi constriction device arranged in the primary conduit at said second section and at the outlet portion ; wherein said Venturi constriction device having an inlet section in fluid communication with the primary conduit to allow the first flow (F1) to be introduced into the Venturi constriction device itself, said inlet section having the same dimensions as the primary conduit ; said Venturi constriction device is a separate body with respect to the primary conduit and interchangeable so as to uniform the minimum and maximum speed of the flow (F2) crossing the sensor regardless of the type of fluid and the flow rate thereof through the primary conduit . - an inlet portion and an outlet portion and a primary conduit for transporting the fuel extending between said inlet and outlet portions for transporting a first flow (F1) of fuel; said primary conduit being defined in a main body of the module ; - a secondary conduit for transporting fuel, adjacent to said primary conduit and extending between a first section and a second section of said primary conduit and arranged in fluid communication with the latter for transporting a second flow (F2) of fuel between said first and second section , the secondary conduit being parallel to the primary conduit and being defined in a peripheral portion to the central portion of the main body ; further the secondary conduit being defined in a portion of said main body radially distanced from the primary conduit ; - a sensor for measuring the flow rate of fuel introduced into said secondary conduit ; said sensor being configured to be installed through a cavity of the main body so as to be able to reach the secondary conduit and the second flow (F2) of fuel; - a Venturi constriction device arranged in the primary conduit at said second section and at the outlet portion ; wherein said Venturi constriction device having an inlet section in fluid communication with the primary conduit to allow the first flow (F1) to be introduced into the Venturi constriction device itself, said inlet section having the same dimensions as the primary conduit ; <EOS>