Fox Marine Gateway

I don't believe the gateways calculate gallons burned. They simply report what the ECM is broadcasting. It would be news to me if they did.
 
I don't believe the gateways calculate gallons burned. They simply report what the ECM is broadcasting. It would be news to me if they did.
Sorry, good point. I should have said the fuel flow per engine reported at the plotter is the same as flow reported in the app, so the gateways are seeing the incorrect flow
 
And to the point of the data, the engine doesn't really measure fuel flow in the traditional sense. It calculates it based on how long the injectors are on. They are usually pretty accurate, but in my case The fuel pump wasn't delivering enough fuel, so the injectors were staying on longer, reporting a larger fuel burn than it really was. Interesting that yours is reporting a lower fuel burn. I'd repeat the test just to make sure that wasn't some anomaly. I've had the mechanical flow sensors with gps input to calculate MPG and total burn. It was within 5% or so. Once you see it, you don't want to see it anymore ;-)
 
And to the point of the data, the engine doesn't really measure fuel flow in the traditional sense. It calculates it based on how long the injectors are on. They are usually pretty accurate, but in my case The fuel pump wasn't delivering enough fuel, so the injectors were staying on longer, reporting a larger fuel burn than it really was. Interesting that yours is reporting a lower fuel burn. I'd repeat the test just to make sure that wasn't some anomaly. I've had the mechanical flow sensors with gps input to calculate MPG and total burn. It was within 5% or so. Once you see it, you don't want to see it anymore ;-)

I’ll get a good test tomorrow morning, I’m running back across the lake from Toronto and should be down about 70 gallons. I’ll report back. Thanks!
 
So it was off again by the same percentage. I found in the settings on the app you can change the fuel burn calc. I set it to 1.65 and I think it’s dead on now. We burned about 70 gallons so I’ll fill up soon and find out how close it was
 
So it was off again by the same percentage. I found in the settings on the app you can change the fuel burn calc. I set it to 1.65 and I think it’s dead on now. We burned about 70 gallons so I’ll fill up soon and find out how close it was
Nice, I didn't know that was there. Dedicated fuel flow meters have a calc adjustment as well. Now I'll have to check mine for accuracy.
 
Nice, I didn't know that was there. Dedicated fuel flow meters have a calc adjustment as well. Now I'll have to check mine for accuracy.

To close the loop on this, finally had a chance to fill up with my adjustments and it is absolutely spot on now. Was two gallons off, but I ran the genny for 2 hours which should be about a gallon an hour. Turns out we run at 1.3-1.4mpg, which is still pretty dang good
 
Can this run straight to Bluetooth without connecting to a backbone? Does it get its power through the backbone?

Thanks.
 
I’ve never tried to disconnect the backbone. However, I think it’s powered from the backbone, not the ECU.

I just finished winterizing this past weekend. Otherwise I’d try to disconnect it and see what happens.
 
Can this run straight to Bluetooth without connecting to a backbone? Does it get its power through the backbone?

Thanks.

they get their power from the n2k backbone but you could do a simple setup with 3 T’s, two end resistors, and the switch 12v power. If you’re not hooking up to an mfd no need to run a long backbone cable.
 
Can this run straight to Bluetooth without connecting to a backbone? Does it get its power through the backbone?

Thanks.
The gateway has to get power. Normally, that's the backbone. you can power them directly, and use Bluetooth to your phone.
 
The NMEA 2k cable needs power. When I supplied engine data through the backbone to my Garmin chartplotter, I used this - it was very simple. You'll note the starter kit comes with a power cable. The only other part I added - aside from the two Fox Gateway boxes which worked exactly as advertised - was an $8 switch with a light in it so I knew the system was powered.

https://buy.garmin.com/en-US/US/p/66030
 
OK,

Installed FOX gateways, added 2 Garmin flat screens and removed the analog gauges. Now it won't start or make audible ignition buzzer.

Apparently the buzzers are part of the gauge wiring so, ignition wire is run to both tachometers with a ground and a sender wire. does ignition wire have to be combined or bridged with another wire when gauges are removed to complete the ignition circuit?

Help...…

Jon
 
Your answer is in here.
Gauges are not part of the ignition circuit. The ignition circuit feeds power to the gauges. The senders feed signal to the gauges.
 

Attachments

  • 1998 370 DA Owners Manual Tab 12 Supplemental Information DC Wiring Diagram.pdf
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Your answer is in here.
Gauges are not part of the ignition circuit. The ignition circuit feeds power to the gauges. The senders feed signal to the gauges.

I got down to the boat today and use the wiring harness color code chart that I have for the SeaRay.. I found there is an ignition wire that runs from the ignition switch up into the analog gauge display harness and post fastened to the tachometer for engine one and tachometer for engine two. It is a purple wire and using my meter and the ignition switch I discovered there is a loop there at those gauges that enables The warning buzzer and also conducts ignition wire power to loop back to the engine and completes the circuit to allow the engine to run. once I combined the wires together, as if they were connected to the posts n the tach, all systems worked normally.
 
I know I'm restarting an old thread, but I think it's a great one. I have a 99 380 with 7.4's. Is there a shortcut to figuring out which MEFI I have?
You can have the engine scanned and the scanner will tell you. Otherwise you need to look at the ECMs.
 
I know I'm restarting an old thread, but I think it's a great one. I have a 99 380 with 7.4's. Is there a shortcut to figuring out which MEFI I have?
99 380?? I thought the 380 came out in 2002. The AC model did. Aside from the helm design and moving things around in the bilges, the 370AC and 380AC are nearly identical.

The Fox Marine site has a good set of instructions to help ID them. Given your year and engine, same as mine, it's most likely the MEFI 3. These have 2 connectors, at each end of the module, vs 1 on the MEFI 1 & 2. However, the MEFI 4 is identical in appearance to the 3, so you have to remove the module to see the details on the tag, but 4 was not released for several more years.
Look for the Service Manual online. I got a paper copy with the boat, and found the PDF online. Almost half the book (nearly 400 pages of it) is dedicated to the MEFI and related details. I also found a "marine power" branded MEFI 3 manual, with 569 pages.
I just found this in the service manual:
upload_2023-7-31_14-53-31.png
 
99 380?? I thought the 380 came out in 2002. The AC model did. Aside from the helm design and moving things around in the bilges, the 370AC and 380AC are nearly identical. ...

1999 was the first year for the 380 sundancer, 02' was for the Aft cabin.
 
I know I'm restarting an old thread, but I think it's a great one. I have a 99 380 with 7.4's. Is there a shortcut to figuring out which MEFI I have?
MEFI-1 sits in a box with a lid on the port side of the engine. Your serial number will tell the story if it's original. Service manual 23 is likely your engine, and with 1999, it's likely a MEFI-3 unless it got "fixed" with a MEFI-4.. That will have an additional plug harness that swaps a bunch of pins around. BUT a picture is worth a thousand opines.....
mefi1-4.png
 

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