K100rs fuel pump relay

[frankenduck]

That should work.  If you're just running the pump for a few seconds to test it then you should be OK running it dry.  I've done it lots of times.

[grant71]

Ok. I did that and the pump runs perfectly. Now what. ? Do i check circuit from fuel level inside to pump terms ? Do i look at fuel press reg ? I am renewing fuel filter. Very little contamination

[frankenduck]

Check the continuity from the connector outside the tank to the fuel pump leads.  It's not unheard of for the wiring at the base of the fuel level sender to fail.  You'll probably need to replace the FLS if that's the case.

[grant71]

As i see it the wires from f l s are brown pos and black neg. Now the pump is out of the tank. Which colour wires from conn are the ones to f l s ? Thank you for your patience

[frankenduck]

The lead to the fuel pump with the larger ring terminal(probably black) is ground - connects to brown outside of the tank.  The other one (probably a faded yellow) connects to the green/white outside of the tank.

[grant71]

Now we are getting somewhere. I conn the tank pump wires to the pump and then took 2 wires direct to the battery. Pump worked. I then took same batt wires via the tank conn. Viz. Pos to green and neg to brown. Pump did NOT work. Looks like the  earth via the fuel level sensor is faulty. What is solution ? Thanks for your help. You are spot on re fuel sensor

[grant71]

I took the fuel level out. No continuity. So i need another unit. What do you ask for a used fuel level unit ?