Floscan Series 9700/97000 Standard Flow GPS Interface System (twin engine model) - Manual (Page 11)

03/05/2008 4001-325-00H
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
• System Start-Up. Start and run your engines. Survey the installation for leaks and other problems. If the system is not operating
properly refer to the Troubleshooting Instructions and correct any deficiencies. When the engine reaches operating temperature
increase engine speed to about 1500-2000 RPM. Letting it run for five or ten minute’s helps purge residual air from the system.
• Any vacuum leaks between the fuel tank and lift pump will allow air to be drawn into the system. These leaks cause high
and/or fluctuating GPH readings. Only severe leaks affect engine performance, but all leaks affect sensor performance and
instrument readings. Vacuum or suction leaks occur at improperly sealed primary filters, loose packing nuts on cross over &
shut off valves and improperly sealed fittings. Vacuum leaks can also occur from corroded copper fuel lines and chaffed fuel
hose, (where it rubs against bulkheads or engine parts). To verify that a suction leak is present, temporarily insert a clear
piece of fuel resistant tubing downstream of the Forward Sensors’ outlet. Observe the clear hose for at least two minutes
looking for bubbles. Bubbles can appear as a constant stream of small bubbles, or as an occasional larger bubble. Tighten all
possible leak sources, grease primary filter seals and install fitting seals on JIC/SAE fittings. Continue to observe the clear
tubing until it runs clear without any bubbles. Flex or wiggle rubber hose sections while observing the clear tubing. If bubble
volume increases inspect the hose and check its fittings. Repair as necessary.
• When idling in neutral, (No Load) GPH fluctuations can also be caused by the governor trying to maintain a steady engine
RPM.
• Calibration. When the system is running properly, refer to the calibration instructions and calibrate your system. If installed
properly, initial calibration takes much less than one hour. After consuming some fuel, final calibration should only take a few
minutes.