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Author Topic:   OUTRAGE 22 Garmin Fuel Sensor
stayinstrewn posted 04-25-2015 11:20 AM ET (US)   Profile for stayinstrewn   Send Email to stayinstrewn  
[Seeks] photos of how to install a Garmin GFS 10 fuel sensor. I have an Outrage 22 with notched transom, and I'm not sure the best place to install [the fuel flow sensor]. I have a fuel filter just under the gunwale. The Garmin directions say [the fuel flow sensor] should be mounted vertically so the fuel doesn't have bubbles going thru it to mess up the measurements. Ideas welcome.
jimh posted 04-25-2015 12:04 PM ET (US)     Profile for jimh  Send Email to jimh     
When I had a fuel flow sensor, I mounted it according to the instructions, which also insisted on orienting the sensor vertically with the flow arrow pointing up.

The sensor was inserted into the rubber fuel hose feeding the engine. To hold the sensor in position, I used a set of flexible chocks that were intended to hold the tube or mast of a removable white all-round navigation lamp. I mounted the chocks to the transom and pressed the fuel hoses into the chocks.

jimh posted 04-25-2015 12:12 PM ET (US)     Profile for jimh  Send Email to jimh     
The chocks I used were similar to these:

On an OUTRAGE 22 there is not much height above the deck to the top of the gunwales. Once you have the fuel filter just under the top of the gunwales, there is no vertical rise left.

How about cutting the fuel flow sensor into the hose that is feeding the filter? It is not the best place, because debris in the fuel could affect the sensor, but it does get the sensor in a vertical orientation.

Or, bring the fuel hose from the filter output port back down to deck level, and then bend the hose upward to the sensor mounted on the transom inboard face.

stayinstrewn posted 04-25-2015 01:39 PM ET (US)     Profile for stayinstrewn  Send Email to stayinstrewn     
That's what I've been thinking, essentially a J shape for the hose to come down to deck level then back up to allow vertical mounting.

I was also thinking of a stainless eye strap to act as a fair lead for the fuel hose coming from the sensor to the motor. Although there's no load per se other than its own weight, I don't want the sensor to have any load on it whatsoever.

conch posted 04-26-2015 12:24 PM ET (US)     Profile for conch  Send Email to conch     
Installing two GFS-10 sensors, I removed the output hose from the [manifold] of each RACOR filter and inserted 3/8-inch fuel line, curving down in a circle, and installed the sensor on the up side of the line. Then a short length of hose to a 90-degree fitting. And then installed the original hose to the opposite end of the fitting. The included tie-wraps have screw mounting holes to orient and fasten the hoses, and the sensor has a mounting bracket.

I had to go back and get the sensor ID numbers to tell the Chart plotter port and starboard. Then the NMEA-2000 drop cable was too short to reach across the beam to the bacckbone; I had to remove and add a 2-meter extension and fish it across again.

stayinstrewn posted 04-26-2015 08:50 PM ET (US)     Profile for stayinstrewn  Send Email to stayinstrewn     
Thanks Conch. I decided to run new 3/8-inch line, starting from the copper supply line in the starboard bilge, then to the sensor, then up to the fuel-water separator. There the fuel line reduces to 5/16-inch, as it was before. This guarantees vertical flow. There was no mounting to the hull; I used zip-ties to nearby cables.
jimh posted 04-26-2015 10:48 PM ET (US)     Profile for jimh  Send Email to jimh     
I think you are describing the option I suggested of mounting the fuel flow sensor before the fuel-water separating filter. It is hard to describe complicated rigging in a narrative. Maybe you can show us a sketch.
stayinstrewn posted 04-27-2015 10:18 AM ET (US)     Profile for stayinstrewn  Send Email to stayinstrewn     
I ended up putting [the Garmin fuel flow sensor] between the tank and main filter as there was more room to work, and I already had a vertical run. Considering Garmin was kind enough to include a filter for those who don't have one, I did place that in front of the sensor, so hopefully Garmin's own filter will provided sufficient protection!

No need for any mounting, as the battery cables are right there and I'm zipped around those. I will take a couple pictures and post them tonight.

Thanks for all the input. Only misfire was cutting the fuel line from filter to primer as that's where I originally wanted it, but I put that back together with a barbed connector and hose clamps.

Priming the bulb to move some fuel thru the system showed no leaks, and I will closely monitor in the early days this season.

stayinstrewn posted 04-27-2015 07:24 PM ET (US)     Profile for stayinstrewn  Send Email to stayinstrewn     
Here's the install:

jimh posted 04-28-2015 07:53 AM ET (US)     Profile for jimh  Send Email to jimh     
I think we can describe it schematically as:

TANK ---> Garmin Filter ---> Garmin Sensor --->RACOR filter--->Primer bulb--->Engine

stayinstrewn posted 04-28-2015 10:42 AM ET (US)     Profile for stayinstrewn  Send Email to stayinstrewn     
that's the ticket Jim

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