FE Petro Mechanical Leak Detector For Diesel

FE Petro Mechanical Leak Detector For Diesel


For use with 4" STPs, the MLD product line is precision built, with unique construction features that provide busy stations with maximum flow rates and long service life. The MLD is offered in three models to match your exact application, ensuring accurate, nuisance-free operation critical to profitable station operation.



  • Piston style construction with reduced volume allows the MLD+ to react quickly and provide more accurate leak detection capabilities.
  • A specialized metering pin unique to only the MLD+ provides precision leak detection for any type of pipework system including flexible, rigid or a combination of the two.
  • Burnished piston chamber provides smooth operation and long service life.
  • Color coded covers easily identify the model to the application (gold for diesel and blue for gas).
  • Opens completely to allow maximum product flow during fueling operation and remains open with discharge pressure as low as 1 PSI (0.07 bar).
  • Compatible with FE Petro™ brand STPs, as well as competitive STPs and line leak detector housings.
  • All models are capable of detecting line leaks equivalent to 3 gph at 10 psi (11.4 lph @ 0.70 bar) when installed properly with the appropriate fuels - all models will signal detection of leaks by restricting product delivery to less than 3 gpm (11.4 lpm) and taking more than 4 seconds to open
  • All models will remain in the open position during product delivery to manifold, with discharge pressures as low as 1 psi (0.07 bar) - all models will reset to "tripped" when line pressure delay is below 3 psi (0.21 bar) with pump off
  • Detects leaks up to 10 feet (3 meters) above the point of installation
  • Max. liquid viscosity of 70 SSU at 60 °F (15 °C)
  • Diesel models (gold cover, MLD+D and MLD+BD) are also listed for kerosene applications 
  • cULus listed
  • Third party certified to comply with US EPA requirements
  • 280.41 (B) and 280.44 (A) for continuous monitoring of pressurized piping