Reversed Fuel Gauge

[Guest jwts]

I have a 2004 SuperSpec kit with the 3 connection fuel tank.

 

I have connected up the instrument cluster and find the fuel gauge reads reversed (it reads full when it is empty).

 

Is there a simple solution to this like swaping the brown and white wires in the pic below

 

 

or is it possible to swap wires around on the fuel gauge itself?

 

Regards,

 

John (jwts)

[Longboarder]

No harm it trying with wire swaps but as the gauge usually measures resistance it has no effect. I would try for a float arm swap around which means extend the arm and get it to stick out in the opposite direction. Like in the pic.

 

Nigel

[Guest rhetorical-oracle]

Hi John,

 

I found that on my fuel sender, which looks slightly different to yours, that it worked by altering a sliding resistor bar ctuated by the float arm inside the tank. I fixed it my unsoldering the white wire from 1 end of the resistor bar and soldering it to the other, thus altering the resistance so it measure the opposite way around. This fixed it so the gauge reads the right way.

 

Phill

[Longboarder]

That makes sense. Easier if you can get in there at it.

 

Nigel

[Guest jwts]

Hi John,

 

I found that on my fuel sender, which looks slightly different to yours, that it worked by altering a sliding resistor bar ctuated by the float arm inside the tank. I fixed it my unsoldering the white wire from 1 end of the resistor bar and soldering it to the other, thus altering the resistance so it measure the opposite way around. This fixed it so the gauge reads the right way.

 

Phill

 

Phill,

 

Is it possible to get the sender unit out? Mine keeps getting jammed and the sharp edges on the access hole threaten to cut through the wiring insulation.

 

John.

[Guest chris brown]

Phill,

 

Is it possible to get the sender unit out? Mine keeps getting jammed and the sharp edges on the access hole threaten to cut through the wiring insulation.

 

John.

It went in so must come out just be careful and you’ll get it out.

[Snapperpaul]

European gauges read 10 ohms empty 180 full and USA gauges read 240 empty 33 full, i think the old sierra senders we have are old ford stock and run 240 to 33, re wiring may work as long as the earth is not earthed through the sender body if so you would create a short circuit.

With my sender i may have to isolate the two metal bars that clamp it down to the rubber seal.

MNext job once i have cured the MegaJolt problems.

[TonySuperSpec]

One side of the sender in the tank is earthed so reversal of wiring does not work... ^_^

 

At my SVA the tester Dave thought it was quite cool to have the gauge backwards.

 

I know some people have extracted and revesred the arm but mine is backwards and is quite accurate so 1/4 full registers a 1/4 empty..

 

Enjoy....

 

:rolleyes:

[Bob Tucker]

Use powerpoint or photoshop & make up your own dial face .......

Works for inaccurate speedos too....

 

Bob

[TonySuperSpec]

Inaccurate speedo's..... not on a RH !!!!

 

Mine just got through the SVA

 

Read 79.5 @ 70 thats the worst error

 

Oh to find the right sender gear for an MT75..

[fry61]

ETB do rising resistance & falling resistance fuel gauges.