Resistive fuel level sensors

[Elmer]

Hi, I'm about to calibrate my fuel gages to the SV 1000. I have pins 20 and 21 used. I have two 15 gal tanks. Could someone give me some pointers on how I calibrate the resistive fuel gages? Also is the 20 and 21 pins all I use to hook to the gages? Don't I need some power?
Thanks for any help,

 

[Carl_Froehlich]

The EMS install instructions tell you how to wire the fuel senders.

If the calibration is done carefully your float fuel level indication will typically be within a gallon of actual. Here is how I do this:
- Replace your inline fuel filter with a temporary plastic "see through" filter from your favorite auto parts store. Install the filter before your electric boost pump. Route the fuel from this filter via temporary hose to a five gallon gas can.
- Get 20 gallons or so of 100LL. Fill one tank and flush it out using your fuel pump to the gas cans. Repeat this flush until you stop getting junk out of the tank. Repeat for the other side.
- Level the plane.
- With the gas tanks empty, follow the Dynon instructions for fuel level calibration adding one gallon at a time. If you have a typical install, the floats will work for the first 75% or so of the tank capacity, then will reach the end of their movement range. So if say this is 12 gallons, the readout on the Dynon will say "12+" until you burn down below 12 gallons, then it will read the actual tank level.

Carl

 

[Elmer]

Thanks Carl, Is all the instuctions in the Skyview 1000 when I start calibrating? I can't locate the page for calibrating resistive fuel level sesors. need more help.
Thanks,

 

[Carl_Froehlich]

Look at page 3-13 of the current install manual. Once you enter this calibration wizard it will walk you through the steps. This was amazingly easy compared to what I had to do with my old Grand Rapids EIS.

Carl

 

[Elmer]

I ran into a problem. It did turn out to be very easy, but as I was adding one gal at a time the Voltage wouldn't change. I had six gal in and the voltage stayed a 3.18. I think the problem could have something to do with having two out side gages plus the skyview installed. I read that, that is a no no. on a past post. Is the voltage staying at 3.18 caused by the two outside gages? I'll appreciate any help with this.
Thanks

 

[Carl_Froehlich]

Recommend not using analog gauges attached to the same senders as they will totally screw up the input to the SkyView and not be nearly as accurately as the SkyView EMS fuel level readout anyway.

As (I assume) you are using the SkyView fuel totalizer feature, I propose there is no practical reason to have a backup to the SkyView EMS fuel level indication. The fuel level indication itself is a backup to the more accurate fuel totalizer read out. The backup feature covers the chance that you are leaking fuel someplace, didn't get a full top off, etc. - thus will not show up on the fuel totalizer.

So - get rid of the analog gauges, solve your problem and free up some panel space as a bonus.

Carl

 

[Elmer]

Thanks Carl,
One thing I found today is the fuel float in the tank is stuck up. I'll try to push it back down and see if it still works. Then I'll go from there.