MEP-805B Fuel Gauge Issue

[ryanb72]

My fuel gauge on the display jumps up and down and a lot of times shows I have no fuel or 100% fuel or somewhere in between. I have checked the sender and it seems to be working ok. Any other suggestions on what might be going on with it? Generator is in great condition with 200 hours on it.

 

[Guyfang]

How did you check the sender?

 

[jamawieb]

Check ohms. Full should be 33ohms and empty is 240. If its bad, take it out and measure the depth. Then look on amazon for a new float. The 15kw use a 10" float and the 60kw uses a 14" float. Not sure on the 30kw

 

[ryanb72]

I removed it and did the ohms test and it is reading per the parameters it should. Is it possible it has a bad ground?

 

[Guyfang]

Maybe you need to look at/test the sender.

 

[Ray70]

If you have the sender out, test it with an ohm meter, but pay close attention to the meter readings.
If you have good connections on your leads but notice the meter reading bouncing around at all or intermittently going to an open lead while moving the float through it's range of motion, then the sender is bad.
You have to test it's full range and look for dead spots.
Also, try testing it held vertically not laying down on its side.
If you're 110% positive its good, clean it and test the ground connection in the machine.

 

[ryanb72]

Ok. Let me take it back out and test it again through the entire range.

 

[Guyfang]

Is there one or two wires to the sender? If there is two, then one is + and the other neg. If there is only one, and the fuel tank is plastic, then you need to attach a wire from the sender mounting base, to ground.

 

[LuckeyD]

You got a 2 wire sender. It sounds like a lose connection more then a bad sender. Gonna sound funny, but remove the control box cover. behind the control box are 2 large connectors. Make sure they are tight. Sender full tank 29-36 ohms. Empty tank 216 -264 ohms. The 2 wires feed directly thru the backplane and connect to the I/O at J23 pins 5 and 22. Check your connections as on these gens they become loose all on their own. I attached a small booklet that may assist. It even says how it all works, and contains a full schematic on the gen with notes. Makes good reading to ensure you fall asleep.