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ContinuousWave: Small Boat Electrical
Northstar F-210 Fuel Instrument
|Author||Topic: Northstar F-210 Fuel Instrument|
posted 08-12-2008 09:08 PM ET (US)
I just installed [a Northstar F-210 fuel instrument]. I don't get steady fuel flow readings. I can be trolling and it will read 0.7-GPH. I speed up to about 3,500-RPM and [the Northstar F-210] reads 1.3 or 1.4-GPH. I don't think that reading is correct. [Solicits] suggestions. Thanks, Fred
posted 08-21-2008 02:30 PM ET (US)
I just installed the same unit and have less than an hours use of it but my experience would be the same as yours and what I would expect. More rpms more fuel burned. As for the actual gph it would depend on specific motor and the load at a specific rpm
posted 08-21-2008 08:45 PM ET (US)
Let me know how the meter keeps woring to see if it falls into place, I'll keep you posted on mine.
posted 08-21-2008 08:50 PM ET (US)
I do not understand why you think there is a problem. When the motor is at idle the fuel flow will be low. When the motor speed is increased the fuel flow increases. The readings you are seeing on the Northstar F-210 seem to follow that general pattern.
Explain why you think there is something wrong.
posted 08-23-2008 10:01 PM ET (US)
It's the reading that I am seeing that make no sense. I can be crusing along without touching the throttle and the meter will go back and forth up and down number wise.
In other words the readings are quite erratic. I can throttle up and the fuel flow will drop or visa versa.
I will ck the readings again next weekend and report back.
posted 08-24-2008 09:02 AM ET (US)
Fred--What type of motor are you using? If you have a fuel injected motor the fuel flow may occur in spurts. Typically fuel flow in a fuel-injected engine is controlled by a float switch in a fuel-vapor separator. The lift pump supplies fuel to fuel-vapor separator. A second fuel pump then raises the pressure and circulates the fuel to the injectors. This may result in the fuel flow meter showing variations in flow rate.
Also, they may be an adjustment on the gauge to increase the time period over which the flow rate is averaged before display. Making the time period longer should result in the flow rate display settling down and not changing so fast.
posted 08-24-2008 03:38 PM ET (US)
I have the new Merc 115 HP that comes with the Montauk 190, 4 stroke, fuel injected.
posted 04-13-2009 01:38 AM ET (US)
My lowrance flow gauge does the same also.
posted 04-13-2009 09:20 PM ET (US)
It's measuring the fuel flow rate at whatever point in the
system it's being measured. If there's a reservoir upstream,
it can be highly variable. And even if there isn't, it can
be highly variable. For example, if you are climbing a swell,
consumption may go DOWN on a two-stroke because the RPMs
Also, they the rate meteres need to be calibrated.
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