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Author Topic:   Fuel flow meter electrical hookup
pashopper posted 05-27-2003 03:04 PM ET (US)   Profile for pashopper   Send Email to pashopper  
I purchased and installed a fuel flow guage on my 97 Conquest to give me off shore piece of mind and now I am re-thinking how I wired the devise.

I wired the guage to be on when the battery switch is turned on. I did this becuase I have a manual pull 15hp 4stroke motor for trolling. I put a fuel guage valve in to run the kicker off the main tank so I do not have the carry the portable tank. I installed the fuel flow meter at the Y so I get the fuel flow no matter which engine is running.

My concern is when camping the amp draw on the fuel flow guage when the battery is on (lighting when needed). I do not want to wake up to a dead battery because of the fuel flow light.

I am interested in anyones experience or comments.

BW23 posted 05-27-2003 04:26 PM ET (US)     Profile for BW23  Send Email to BW23     
Funny you brought that up. I'm also experiencing the same wiring question.

I ran a 14 awg, 2 cond tinned copper cable from my ACC 2 switch to my helm panel. This is where I mounted the FF41 fuel flow meter and Garmin 2006C GPS/Chartplotter.

I installed it this way not knowing that the FF41 fuel flow meter does not power on/off via a button (did not read the instructions) rather a voltage applied on/off.

I'm considering a wiring change to turn it on/off via the ignition switch. I will probably just tap off the hour meter as a fix.

Specs. mention that the unit draws 70mA with backlight on.
I would re-wire just for peace of mind.

tully_mars posted 05-27-2003 04:42 PM ET (US)     Profile for tully_mars  Send Email to tully_mars     
I have two Fuel Flow meters on my boat (by NavMan) which are on all the time when power is on via the battery switch in the stern. I have left them on for very extended amounts of time, up to a full weekend. Never fully discharged a battery to the point of not starting an engine.

If you have two batteries in your boat (and you should) they should be running off only one battery at night, and leave the other for a backup just in case so you can start your motor/motors in the morning. My boat 98 Conquest is rigged with T150's.

Tully Mars

Backlash posted 05-27-2003 04:53 PM ET (US)     Profile for Backlash  Send Email to Backlash     
On my 21 Walkaround, one of the factory installed switches is labeled "Compass Light". I wired my KVH fluxgate compass to this switch to power it on and off. I wired my new FF41 to this same "Compass Light" switch. When I turn it on both the compass and FF41 power up. BTW, the FF41 apparently has an internal battery to retain all settings when it is powered down. I don't see any need to have it constantly on.
andygere posted 05-28-2003 09:05 AM ET (US)     Profile for andygere  Send Email to andygere     
I powered my FF41 Fuel Flow meter off of the main engine ignition so that it only has power when I run the engine. Standard Horizon's instructions said to put the sensor downstream of the fuel filter, so I was not able to capture the fuel used by the 15 hp kicker on my Outrage. This is because each motor's fuel line pulls from a different port on the same Racor fuel filter. I didn't want to intall a Y off the sensor in order to get fuel usage for both motors. My reasoning is that compared to the 200, the 15 uses very little fuel, and so I'm not that interested in how much I'm using from that motor. I still have a very accurate mechanical guage in the tank as a back up. Even after several hours of trolling on the kicker, the actual fuel used and the reading on the FF41 totalizer is within a few gallons.

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