Check out my thread on the K100-forum -
Messing with the In-tank Fuel Sender.
There is no color continuity between the wires outside the tank and wires inside the tank, unfortunately. So, there should not be continuity between yellows. You should check the following:
- continuity between brown on the tank connector and the tank itself and also to the small ring terminal on the black wire that goes to the pump
- continuity between Green/White on the tank connector and the Large ring terminal on the yellow wire that goes to the pump
- resistance between the yellow wire on the tank connector and Brown wire on the same connector. This resistance should vary as the fuel float arm is raised and lowered
- connectivity between the White wire on the tank connector and Brown wire on the same connector. This connectty should make and break as the float arm is raised and lowered.
Check the following:
1. disconnect the tank from the harness.
2. Using clip leads, connect a voltmeter between the Green/White wire on the harness connector and ground on the bike.
3. Turn on the ignition. You should not measure any voltage
4. press the start button. The voltage should jump to about 11V
5. release the start button, and monitor the voltmeter. The instant you release, the voltage should jump from 11V to 12.4V or so, then 1.5 seconds later, drop to 0 volts.
If this test succeeds, then you have verified that the FI circuit is working. You can therefore eliminate that as a variable and concentrate on the tank internals as your problem area.
Most likely, you have a broken connection within the fuel sender that needs repair. Strangely enough, if so, this will be the second case of such that I have heard about this year.
