Tank level gauge is showing inverted values

[Karlsenkystfiske]

I replaced the FW tank level gauge as the old one was off with about 1/4 of a tank. The new KUS gauge came with a contact instead of bolted connections so I got to do some wire splicing. When I power it up it shows the tank as empty when it is full, and full when it is in fact empty. Is thast due to me putting transmitter wire in the wrong place, or due to the instrument having different resistance scale . This one is 33-240 ohms. Perhaps I should have used one with 0-180 ohms?

 

[Graham_Wright]

Sounds like crossed +/- connection.

 

[Refueler]

It can be down to different format ... as you ask ... I stand to be corrected but I think USA gauges are reversed and different ohms to Euro type.

 

[johnalison]

It can be down to different format ... as you ask ... I stand to be corrected but I think USA gauges are reversed and different ohms to Euro type.

That was what I was going to say.

 

[tross]

As Dr Who would say - reverse the polarity on the Flux capacitor

 

[Refueler]

As Dr Who would say - reverse the polarity on the Flux capacitor

If its wrong unit as I think it is - reversing will not correct it ..

And anyway - Flux Capacitor is from "Back to the Future" !

 

[PaulRainbow]

Post 3 is correct and reversing wires is not possible.

 

[Dellquay13]

The cheapskate in me would briefly consider getting my label maker out and rotating the display through 180deg…

 

[Refueler]

The cheapskate in me would briefly consider getting my label maker out and rotating the display through 180deg…

And turn gauge through 180 so needle moves in correct direction !

 

[PaulRainbow]

I replaced the FW tank level gauge as the old one was off with about 1/4 of a tank. The new KUS gauge came with a contact instead of bolted connections so I got to do some wire splicing. When I power it up it shows the tank as empty when it is full, and full when it is in fact empty. Is thast due to me putting transmitter wire in the wrong place, or due to the instrument having different resistance scale . This one is 33-240 ohms. Perhaps I should have used one with 0-180 ohms?

Where did you get the gauge ? You should be able to send it back for the correct one.

 

[Boater Sam]

Read it in a mirror?

 

[salar]

If you connect a US gauge to a UK sender or a UK gauge to a US sender you will get reversed readings. There is no fix. Buy the correct matching unit.

 

[webcraft]

If you connect a US gauge to a UK sender or a UK gauge to a US sender you will get reversed readings. There is no fix. Buy the correct matching unit.

Or get used to it working backwards, like we did.

- W

 

[LittleSister]

The gauge is now telling you how much air you have in your tank, or to look at it another way, how much short of a full tank your FW supply is!

You can remedy the problem either by buying a different gauge, or a different sender. As others have said, they have to be compatible types. It is not to do with the resistance (ohms) value so much as whether the resistance falls or rises as the tank empties.

 

[Roberto]

I once had the same problem and happened to find this device, I have not bought nor tested it, no idea what it exactly does, if you manage to decypher the instructions it might possibly help


1PCS Kraftstoff Gauge Signal Adapter Konverter Kraftstoff Meter Signal Konverter für FM101 Kraftstoff Tank Interface - AliExpress 34

 

[Minerva]

The cheapskate in me would briefly consider getting my label maker out and rotating the display through 180deg…

Or either turn boat upside down or ship boat to be used in southern hemisphere!

 

[DreadShips]

The gauge is now telling you how much air you have in your tank

This explains why the American sender is the other way around - the Yanks are naturally more concerned with measuring the amount of gas in the tank...

 

[Dellquay13]

Delete

 

[Dellquay13]

It is not to do with the resistance (ohms) value so much as whether the resistance falls or rises as the tank empties.

If this is the case, I would try to look at the wiring at the sender, to see if it is 2 wires on a 3 terminal potentiometer. I would try to move the non-wiper cable to the other end of the pot (or fader if it is in-line).

 

[DangerousPirate]

The cheapskate in me would briefly consider getting my label maker out and rotating the display through 180deg…

I am a programmer, this is how we solve things sometimes. Easiest solution, least amount of headache.

OP I am not expert with fuel gauges, but something must be upside down or reversed. If the polarity can't be reversed, maybe the sender is just upside down?