Fuel Nozzle | Stainless Steel Auto Cut-Off | Diesel Dispenser

This stainless steel automatic fuel nozzle delivers accurate fluid delivery for modern transfer systems. Constructed from corrosion-resistant 304 stainless steel with a built-in venturi shutoff mechanism, this fuel nozzle stops flow instantly when tanks fill to prevent spills, waste, and chemical mess on busy job sites. Features and Benefits - 304 stainless steel cast body - Resists corrosion from harsh chemicals, making it fully compatible with DEF, AdBlue, diesel, and industrial wash water - Automatic venturi shutoff tip - Closes the internal poppet valve the moment liquid covers the spout opening to stop accidental tank overflows - Three-speed hold-open trigger clip - Locks flow at set rates so you can fill large equipment tanks without holding the trigger down - Standard 3/4 inch NPT inlet threads - Connects straight onto typical transfer pump discharge hoses running at minimum operating pressures of 15 PSI Applications - Refueling fleet vehicles, commercial trucks, and farm combines with diesel fuel from powered pump stations - Dispensing bulk DEF and AdBlue into storage tanks and service trucks without rusting or chemical breakdown - Moving industrial chemicals, light process oils, and plant wash-down water across industrial facilities Safety & Materials This fuel nozzle features a robust stainless steel body suitable for dispensing diesel, fuel, oil, and water. When setting up dispensing rigs, ensure all pipe threads, seals, and delivery hoses match the chemical profile of your media to prevent degradation. Tradespeople often ask how does a fuel nozzle shut off during filling. The automatic cut-off mechanism relies on a venturi tube running to the spout tip. As fluid fills the tank and covers the sensing port, airflow stops, creating an internal vacuum that trips the mechanical shut-off valve instantly, preventing overfills and site spills. Core Parts Needed: To build a complete digital dispensing system and understand how to make a fuel flow meter, assemble these components: - Fuel nozzle with stainless steel body and automatic cut-off - Compatible delivery hose and thread adapters - Inline turbine sensor or hall-effect flow sensor suitable for fuel - Arduino microcontroller board - Voltage regulator or buck converter stepping 12v plant power down to 5v - 10k ohm pull-up resistor for the signal line - 16x2 LCD display or OLED module - Enclosure rated for fuel transfer areas - Fuel-safe thread sealant Hardware Connection & Schematic Plumb the inline turbine sensor directly into the delivery hose upstream of the stainless steel nozzle. Power the system using the vehicle or site 12v battery, routing through a dedicated regulator to deliver a steady 5v supply to the Arduino. Connect the ground lines together to form a common ground. Wire the pickup sensor red lead to 5v, black to ground, and the pulse output signal directly to Arduino digital pin 2. Place a 10k ohm resistor between the 5v line and pin 2 to maintain a clean square-wave signal free from line noise. Calibration & Math Understanding how fuel flow meter works helps you configure accurate volume readings. As liquid passes the internal rotor, the pickup sensor pulses per revolution. The manufacturer provides a nominal K-factor, representing pulses per litre. Calculate the dispensed volume using simple arithmetic: volume equals total pulses divided by the K-factor. To calibrate, dispense a known five-litre volume of diesel through the nozzle into a certified measuring container. If the recorded pulses equal 2,250, divide 2,250 by 5 to calculate your real-world K-factor of 450 pulses per litre, adjusting for fluid viscosity. Arduino Code Example volatile unsigned long pulseCount = 0; const float kFactor = 450.0; const byte sensorPin = 2; void countPulse() { pulseCount++; } void setup() { Serial.begin(9600); pinMode(sensorPin, INPUTPULLUP); attachInterrupt(digitalPinToInterrupt(sensorPin), countPulse, RISING); } void loop() { noInterrupts(); unsigned long currentPulses = pulseCount; interrupts(); float litres = currentPulses / kFactor; Serial.print("Fuel Dispensed: "); Serial.print(litres, 2); Serial.println(" L"); delay(1000); }