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post #1 of 4 Old 09-21-2020, 10:38 PM Thread Starter
Dcotes
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Fuel Gauge Issue

I recently installed an Omix-ADA 17724.13 fuel sender unit, 73-10 Ohms in my 20gal poly tank. I also installed an Auto Meter 880428 fuel gauge. The sender is an OEM replacement non-linear unit and the gauge is non-linear 73-10, so they should work together. I'm getting some unusual ohm readings and the gauge is not reading it the way I think it should. it's the second gauge I tried in case the first one was bad. I have a solid 12v source, a proven ground and I even ran a new wire from the sending unit.
Full tank=3 ohms, gauge pegged past full (I understand the ohms are below the 10 ohm limit of the gauge but should it read full or does it make sense that it is pegged way past full?)
14 gal in tank=4.5 ohms, gauge pegged still
11gal in tank=16.9 gal in tank, no gauge, gave up and returned at this point
7gal in tank=31ohms
3 gal in tank=48 ohms
filled tank up to 20 gal= 2 ohms
I'm at my wits end, this is just the end of a long battle with the fuel gauge and sender drama. Do I have any options out there for this issue or do I just keep track on my mileage forever?

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post #2 of 4 Old 09-22-2020, 03:48 AM
John Strenk
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Did you adjust the float arm and limits on the sending units?

Plotting it out in excel it looks like a perfectly good curve up until 15 gal. The 0 gallons intercept point is a little low around 60 ohm
Which makes me wonder if you got the right sending unit or have it adjusted the right way.

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Looks like it's peaking out at 15 gallons which might mean that the stops or the float arm are adjusted wrong. Won't let it go any higher. Since the ohms are too low you might have to adjust your stop a little to get 10 ohms and then bend the float arm higher.

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Bending the float arm so it sits a little higher will make it will float on top of the gas instead of being submerged after a certian level. See if that helps before making any changes.

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The sending unit I have you were able to adjust the stops and the wiper arm and of course bend the arm.
On my gauge I was able to bend down the cover. Then with the float arm fully lifted, I moved the wiper a little clockwise so it starts to move as soon as the arm moved down. But I don't think you have to get that involved.

The more I think about it, I think your float arm needs adjustment. Adjusting the full stops will make it just right.

Now if you bend the arm and you read "EMPTY" with 5 gallons left then the arm it too short and you probably have the wrong sending unit. You can make your float arm longer if you have too.


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post #3 of 4 Old 09-22-2020, 08:57 AM Thread Starter
Dcotes
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John, Thank you for that great post. I did test it prior to installation but it's possible that things changed during the install. I'm pretty sure I have the correct sender, I researched it pretty well. It was quite a challenge to drop the tank (twice to get it right). I'll have to delay it until after all these fires settle down, so next year I suppose. Thanks again. I'll submit another post once I solve this or fail.
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post #4 of 4 Old 09-22-2020, 09:39 AM
John Strenk
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Then a little arm bending is probably all you need.

If you haven't got one so far, get a brass float and get rid of the plastic one.


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