Broken Fuel Guage, How do I check?

[quicky1980 0]

Im unsure if the fuel guage is working and I just wondered how I could check it.

Been told that connecting the terminals at the sender end will allow the fuel guage to think its full and therefore rise on the display unit. But arent their three wires on the pump end, therefore which wires do I need to connect?

 

I know hte easiest way would be to fill the fuel tank full of fuel but I cant get to a petrol station as the car isnt running at the momment

[Supercharged 2]

Looking at the pump end (under the black cap in the boot) there is a plug, take this off and locate the 2 pins with the smaller wires that go to the gauge (the other 2 are fatter as they are power)

 

Now look at the corresponding pins at the pump side (sender assembly) and measure resistance across them

 

Reading full to middle to empty you should get

 

35 Ohms - 90 Ohms - 285 Ohms

 

If you don't get the above and want to see if the gauge works then maybe stick a 100 Ohm resistor into the plug (60W light bulb should be about right for this)

[quicky1980 0]

cheers, thats brilliant information. Will try it this weekend

[quicky1980 0]

I have four wires at the fuel pump end but they are all the same thickness. But I tried bridging them using a resistor and no change on the fuel guage so I think its something else.

[Supercharged 2]

I'm sure they were smalled but the power wire will be red and the earth will be brown and i think these are the outer ones so it's the middle 2 you want...

 

Maybe just the needles dropped off the gauge?