Floscan Series 9700/97000 Standard Flow GPS Interface System (twin engine model) - Manual (Page 20)

07/24/08 4001-443-00
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
10. There must be some vertical rise to the return fuel flow upon exiting the Return Sensor. There should be a minimum, “Up-Hill”
climb of 1 or 2 inches. Higher rises up to 3 feet or a little more are ok.
11. If installing the Return Sensor-Pulsation Damper as outlined in step 9 is not practical, please refer to steps 12 and 13 below.
12. If the return line is fairly horizontal but with a small, “Down-Hill” drop after exiting the sensor, install an upward pointing 45°
elbow into the return sensors outlet port. Install the fuel line with a downward radius bend. Do not pinch the hose.
13. If there is a steep vertical drop in the return fuel line, a tube with a 180° radius bend may be the best option. This option requires:
• One, 90° male elbow with one male JIC 37° 3/8” or Dash 6 (–6) end, and one 1/4" male NPT end.
• Two, Dash 6 (–6), (3/8) FlareTite fitting seals,
www.flaretite.com , (to be installed onto the male JIC fitting ends).
• One, Dash 6 (–6), (3/8) JIC tube assembly.
The tube assembly, P/N 231-058-00 can be purchased directly from FloScan Technical Support. The 90° NMPT x JIC elbow fitting,
and the FlareTite fitting seals can be purchased at most hydraulic shops.
14. Flow sensor model numbers are molded into the colored plastic wire cap. Sensors are shipped in matched pairs. They must not be
mixed on twin engine installations. Match codes are identified by a single stand-alone letter stamped into the sensor body, or from
a colored sticker on the sensors body.
15. Model *235 sensors are temperature compensated and stamped with their instruments serial number, xxxxF (Forward), xxxxR
(Return). *235-2K Temp-Comp sensor kits are precisely calibrated and matched to each instrument. Sensors are labeled
FORWARD and RETURN and must be installed in these positions for proper operation. The instrument head serial number must
match the flow sensor(s) serial number.
16. If there’s a shut-off valve in the return line, do not operate the engine with it closed. Fuel system pressure could exceed the
maximum system working pressure of 40 PSI and may cause a catastrophic system failure. You should either tag the valve so the
engine will not run when it is closed for maintenance, or bypass it with a relief valve.
NOTE: Minimize the number of 90º elbows and pipe fittings on the sensor or pulsation dampers inlet port.
Excessive use may
create a high vacuum, fuel restricting, pressure drop across the forward part of the fuel system. Refer to the engine owners’
manual for maximum fuel pump inlet vacuum. A vacuum gauge can be used to confirm that the system is within limits.
CAUTION, DO NOT OVER TIGHTEN FITTINGS. Over-tightening may crack the sensor’s body or pulsation damper’s
base. Cracks cause leaks, and fuel leaks sometimes cause catastrophic explosions and fire. Assemble fittings with a Lubricating,
Fuel Proof, Non or Semi Hardening pipe thread sealant designed for aluminum and stainless steel threads, (Loctite 567 or equivalent).
DO NOT USE TEFLON TAPE.