Floscan FloNET Standard Flow Model - Manual (Page 35)

01/04/11 2000-085-00C
FloScan Instrument Company, Inc. Tel: (206) 524-6625 Fax: (206) 523-4961
3016 NE Blakeley Street, Seattle, WA 98105 Email: [email protected] Http://www.floscan.com
4. If voltage is present across the Red & Black Network Power Feed, and the FloNET or Fuel-Tron does not, “Light-Up”. Every
connector junction between the Network Power Feed connection and the FloNET Module or Fuel-Tron Instrument must be
disconnected and checked for voltage, until the problem connector or cable section is found.
NMEA 2000 Backbone Cable with Barrier Terminal Strip Connectors
5. Measure voltage across the RED and Black Network Power Supply Connection Wires at the Power Feed Terminal Strip. The
reading should be approximately 12 to 14 VDC, but not lower than 9 VDC.
6. If 12 VDC is not present, measure between the Red power wire and a known good battery minus point. There may be a loose
battery minus connection or other wiring problem. Check wiring, switches, fuse, and the 12 VDC power source.
7. If 12 to 14 VDC is present between the Red wire and battery minus, there may be a loose battery minus connection, broken wire,
open termination or other wiring problem.
8. If voltage is present across the Red & Black Network Power Feed, and the FloNET Module or Fuel-Tron Instrument does not
“Light-Up” supply voltage on every terminal strip must be checked for voltage until the problem connector or cable section is
found.
IV. SENSOR(S) TEST
1. With engine(s) idling, measure and record voltage between the RED power and BLACK wires on the butt
connector side of the Forward Sensor. Voltage readings should be 12 to 14 VDC. ___________VDC
2. Move the voltmeters’ negative lead to the WHITE signal wire. With engine idling, measure and record the
voltage. Readings between 4 and 10 VDC usually indicate a good sensor. ___________VDC
3. Stop the engine while observing your voltmeter. Readings should fluctuate between a high of 9 to 12 VDC,
and a low of 0 to 4 VDC as the sensors’ turbine slows to a stop. ___________VDC
NOTE: This may not be seen on digital voltmeters.
4. With engine(s) idling, measure and record voltage between the RED power and BLACK wires on the butt
connector side on the Return Sensor, (If used). Voltage should be 12 to 14 VDC. ___________VDC
5. Move the voltmeters’ negative lead to the White (Signal) wire. With engine idling, measure and record the
voltage. Readings between 4 and 10 VDC usually indicate a good sensor. ___________VDC
6. Stop the engine and observe the voltmeter. Voltage readings should fluctuate between a high of 9 to 12 VDC,
and a low of 0 to 4 VDC as the Sensors’ turbine slows to a stop. ___________VDC
NOTE: This may not be seen on digital voltmeters.
7. The Sensor(s) may be defective if voltage readings in steps 3 & 5 remain constant. ___________VDC
V. PULSATION PROBLEMS
A stiff anti-siphon valve(s) or miss-plumbed Pulsation Damper(s) can cause fluctuating GPH readings. These are most pronounced at
low Rpm’s and tend to disappear around mid throttle. They are annoying, and can affect totalizer accuracy. To eliminate, repair or
replace any defective valves, or re-plumb dampers according to the Fuel Flow Schematic Instructions.
VI. FINDING FUEL SYSTEM VACUUM LEAKS
Fluctuating GPH and High Totalizer Readings are usually caused by a small vacuum leak between the fuel tank and fuel pump inlet.
Fluctuations tend to be between 2 and 4 GPH. These vacuum leaks also affect totalizer accuracy, causing it to read 15 to 100% high.
Larger leaks produce greater fluctuations and higher readings. They generally do not affect engine performance.