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Fuel Sender Question

 
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robin1(at)mrmoisture.com
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PostPosted: Mon Jun 30, 2008 7:24 pm    Post subject: Fuel Sender Question Reply with quote
RV-10 List,
            I am beginning to learn the hard way about the differences between float type, resistance, senders and capacitance senders. We installed the standard float type resistance senders that are standard with the kit. We are now at the point where we are filling up the tanks 1 gallon at a time to calibrate the G900X and we found that the float seems to top out when the tanks are about half full or at about 14-15 gallons. I always assumed based on the outboard fill location plus the slope of the tanks and given the float location that we would probably not get the last 5 gallons or so as part of our float reading however we are experiencing a much greater “blind” area of approximately half the tank. This leads to a whole host of issues involving the EFIS readings that I don’t want to think about at this time. Obviously the most critical portion of the tank is well represented but it would be great to read my fuel levels well above half way.
Is there something we are missing regarding getting more fuel level resolution out of our resistance senders? The Garmin rep is helping up set up the panel. He said this is a common issue with some Bonanzas to the point where they place two float sensors in the tank, one for the upper portion of the tank and one for the lower portion of the tank.
I am open to any suggestion as to a way to read more than half the fuel in these tanks.

Thanks in advance,
Robin

Getting closer… and further all the time.

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Tim Olson



Joined: 25 Jan 2007
Posts: 2872
PostPosted: Mon Jun 30, 2008 8:41 pm    Post subject: Fuel Sender Question Reply with quote
You should get float movement up to about 23-24 gallons.

Tim Olson - RV-10 N104CD - Flying
do not archive
Robin Marks wrote:
Quote:
RV-10 List,

I am beginning to learn the hard way about the differences
between float type, resistance, senders and capacitance senders. We
installed the standard float type resistance senders that are standard
with the kit. We are now at the point where we are filling up the tanks
1 gallon at a time to calibrate the G900X and we found that the float
seems to top out when the tanks are about half full or at about 14-15
gallons. I always assumed based on the outboard fill location plus the
slope of the tanks and given the float location that we would probably
not get the last 5 gallons or so as part of our float reading however we
are experiencing a much greater “blind” area of approximately half the
tank. This leads to a whole host of issues involving the EFIS readings
that I don’t want to think about at this time. Obviously the most
critical portion of the tank is well represented but it would be great
to read my fuel levels well above half way.

Is there something we are missing regarding getting more fuel level
resolution out of our resistance senders? The Garmin rep is helping up
set up the panel. He said this is a common issue with some Bonanzas to
the point where they place two float sensors in the tank, one for the
upper portion of the tank and one for the lower portion of the tank.

I am open to any suggestion as to a way to read more than half the fuel
in these tanks.



Thanks in advance,

Robin



Getting closer… and further all the time.

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jesse(at)saintaviation.co
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PostPosted: Tue Jul 01, 2008 3:11 am    Post subject: Fuel Sender Question Reply with quote
I usually see the floats work up to 24 to 26 gallons when adding 2 gallons at a time. Either something is obstructing it or somehow it is stuck. You might try rocking the plane a little to see if you can get it moving. Although I have not tried the capacitance senders, I have been extremely impressed with the accuracy of the floats.

do not archive

Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
Cell: 352-427-0285
Fax: 815-377-3694



On Jun 30, 2008, at 11:21 PM, Robin Marks wrote:
[quote]RV-10 List,
I am beginning to learn the hard way about the differences between float type, resistance, senders and capacitance senders. We installed the standard float type resistance senders that are standard with the kit. We are now at the point where we are filling up the tanks 1 gallon at a time to calibrate the G900X and we found that the float seems to top out when the tanks are about half full or at about 14-15 gallons. I always assumed based on the outboard fill location plus the slope of the tanks and given the float location that we would probably not get the last 5 gallons or so as part of our float reading however we are experiencing a much greater blind area of approximately half the tank. This leads to a whole host of issues involving the EFIS readings that I dont want to think about at this time. Obviously the most critical portion of the tank is well represented but it would be great to read my fuel levels well above half way.
Is there something we are missing regarding getting more fuel level resolution out of our resistance senders? The Garmin rep is helping up set up the panel. He said this is a common issue with some Bonanzas to the point where they place two float sensors in the tank, one for the upper portion of the tank and one for the lower portion of the tank.
I am open to any suggestion as to a way to read more than half the fuel in these tanks.

Thanks in advance,
Robin

Getting closer and further all the time.

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robin1(at)mrmoisture.com
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PostPosted: Tue Jul 01, 2008 6:38 pm    Post subject: Fuel Sender Question Reply with quote
[quote]The problem has been mostly resolved. We forgot to put the 90 degree bend in the float attachment rod to keep the float arm from rotating. Without the bend the float just rotated instead of lifting the sender arm. We are now getting resolution to 23 & 21 gallons. That difference is probably a small dissimilarity in the geometry of the arms. We will dig into that soon.I sure hope we didn’t forget to put the 90 degree bend on the engine mount??? Thanks,Robin [b]

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