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0 <br /> Troubleshooting <br /> Problem <br /> Slow Flow(STP-MLD-HC is in the Tripped position only allowing 3 GPM or less flow rate) <br /> Possible Causes <br /> 1. System leak (i.e., line, dispenser, STP/IST, etc.) <br /> 2. Thermal contraction <br /> 3. No time delays in dispensers or not set correctly <br /> 4. Incorrect STP-MLD-HC version <br /> 5. Tank empty/air in lines <br /> 6. Power to STP is off or defective dispenser switch signal (hook) <br /> 7. Defective STP-MLD-HC <br /> Actions <br /> 1. Visually inspect all areas for leaking product. <br /> 2. Insert a pressure gauge in shear valve. <br /> 3. Cycle the pump to confirm that the system is holding pressure. If pressure is not holding, conduct a line test <br /> through the STP/IST. If there are any system leaks, repair, then retest the system. If system has no leaks (line <br /> or submersible), thermal contraction may be a possible cause. Continue to the next step. <br /> 4. Test for thermal contraction per FE Petro Technical Bulletin TB001. If thermal contraction has been verified, <br /> continue with the next step. <br /> 5. Find the opening time (test cycle) of the STP-MLD-HC. Follow step 18 and time how long it takes from when <br /> the submersible pump is turned on until it reaches full pump pressure. The STP-MLD-HC and STP-MLD-HC-D <br /> models typically take 3- 5 seconds. If the test time is not within these specifications, it is possible that there is a <br /> line leak, air/vapor in the line or not using the correct STP-MLD-HC model for the installation, thus causing the <br /> opening time to increase. Cycle the power and time the number of seconds it takes for the solenoid valve in the <br /> dispenser to "click" open, this is an audible indicator and usually easy to hear. This time must be approximately <br /> two seconds greater than leak detector opening time. Consult dispenser manuals for solenoid time delay <br /> installation or adjustment. <br /> 6. If problems continue, contact FE Petro Technical Support at 1-800-225-9787. <br /> Problem <br /> Not catching a 3 GPH leak at 10 PSI <br /> Possible Causes <br /> 1. Air/Vapor in system <br /> 2. STP-MLD-HC installed incorrectly <br /> 3. Using the incorrect STP-MLD-HC version <br /> 4. Testing procedure <br /> 5. Defective STP-MLD-HC <br /> Actions <br /> 1. Make sure all air/vapor in the system has been purged, see step 15. If no air/vapor is present continue with <br /> next step. <br /> 2. Make sure STP-MLD-HC is installed correctly: <br /> a. STP-MLD-HC must be installed in leak detector port on submersible pump manifold or adapter tee <br /> housing and make sure the O-ring is present and not damaged <br /> b. The vapor tube must be installed and vented back to the tank port from the STP-MLD-HC <br /> C. Make sure there are not any in-line check valves between the dispenser solenoid valve and the STP- <br /> MLD-HC <br /> d. If a manifolded system, only one submersible pump can turn on at a time during the leak testing <br /> cycle <br /> e. There must be less than 12 feet of static head in the system <br /> 3. Make sure the correct STP-MLD-HC model is being used for the application (product and piping). <br /> 4. Is the leak testing fixture calibrated correctly (3 GPH leak @ 10 PSI). Has the STP-MLD-HC been fully tripped <br /> before testing, see step 20. <br /> 5. If problems continue, contact FE Petro Technical Support at (800)225-9787. <br /> Note: If a STP-MLD-HC does not operate correctly, or there are any questions concerning installation or service, please <br /> contact FE Petro Technical Service at (800)225-9787. <br /> 9 <br />