hi guys, my red fuel light comes on full when i fill the tank, as it goes down it goes off , back to front so to speak, 
i took off fuel cap and lifted the float, light comes on , when i push the float down, to bottom it goes off   any ideas, thanks in advance

It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?

92KK 84WW Olaf wrote:It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?

yes olaf, the 7l doesnt seem to light amber

It would be nice to have the model year and type of K-bike you own in your signature line.  This helps immeasurably when seeking help.

You have an 84 K100RS I take it based on posts you've made previously.  So, that means you have the older thermistor based fuel sender.  This unit has a pair of resistors inside the tank that change value depending on temperature and a circuit card inside the instrument cluster that interprets their values.  Either the sender or the circuit card is broken. My guess is the sender unit based on neither light working properly, but that's only a guess.  You could disconnect the sender from the harness and test the  thermistors for proper operation to narrow down the failing components. You should also figure out if the 7L indicator bulb is missing, blown or broken while you're at it.

Very important to show model, year and VIN number.

My own K is 84 K100RT and as said you will have the earlier 4/7l warning lights. Later Ks have a single 5l warning light and the units differ. Your fuel rank should be bolted down?

As far as I know the 'sender' units in the earlier tank don't actually move, they work on the basis of the fuel cooling the unit rather than using a float that moves, no fuel means it gets warmer and creates the electrical connection.

robmack wrote:It would be nice to have the model year and type of K-bike you own in your signature line.  This helps immeasurably when seeking help.

You have an 84 K100RS I take it based on posts you've made previously.  So, that means you have the older thermistor based fuel sender.  This unit has a pair of resistors inside the tank that change value depending on temperature and a circuit card inside the instrument cluster that interprets their values.  Either the sender or the circuit card is broken.  My guess is the sender unit based on neither light working properly, but that's only a guess.  You could disconnect the sender from the harness and test the  thermistors for proper operation to narrow down the failing components.  You should also figure out if the 7L indicator bulb is missing, blown or broken while you're at it.

thanks robmack, i,ll work on in during the week, and see how it goes, need to run out the fuel in the tank,

92KK 84WW Olaf wrote:Very important to show model, year and VIN number.

My own K is 84 K100RT and as said you will have the earlier 4/7l warning lights. Later Ks have a single 5l warning light and the units differ. Your fuel rank should be bolted down?

As far as I know the 'sender' units in the earlier tank don't actually move, they work on the basis of the fuel cooling the unit rather than using a float that moves, no fuel means it gets warmer and creates the electrical connection.

this has a float in the tank olaf, if i could find how to post a picture i would

92KK 84WW Olaf wrote:It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?

your most likely right olaf, i did have the fuel sender out, when cleaning out the tank, i probably put the wires,  back wrong, reversed like