Further to my previous post. Can anyone tell me if there's a definitive way for testing the fuel sender unit whilst still in situ in the tank (2002 11550GS)
Many Thanks
Many Thanks
Fuel gauge testing
- Thread starter Spud
- Start date
Fill the tank 1 liter at a time and not the change on the display.
You know how much you have put in, note the number of bars showing.
You know how much you have put in, note the number of bars showing.
Ahh, and then ia saw your other post....
What previous post?
I’m not searching for it…….
First clean the tank connector. The slightest amount of corrosion can make small resistance values which the tank gauge has hard to calculate.
At the fuel tank connector:
Pin 1 brown (ground -ve battery)
Pin 3 yellow gauge resistor
Pin 4 white switch
With the float down. (Empty tank)
the value between Pins 1 and 4 is short circuit
The resistance value between pins 1 and 3 is approx 70 ohms
With the float off the bottom.
The value between pins 1 and 4 is open circuit ( switch is open)
The resistance value will vary on position of float.
With the float fully up ( full tank)
The value between pins 1 and 4 still open circuit
The value between pins 1 and 3 approximately 3 ohms.
So your float gauge should vary between 3 ohms (full tank) to 70 ohms (empty tank) approximately.
I’m not searching for it…….
First clean the tank connector. The slightest amount of corrosion can make small resistance values which the tank gauge has hard to calculate.
At the fuel tank connector:
Pin 1 brown (ground -ve battery)
Pin 3 yellow gauge resistor
Pin 4 white switch
With the float down. (Empty tank)
the value between Pins 1 and 4 is short circuit
The resistance value between pins 1 and 3 is approx 70 ohms
With the float off the bottom.
The value between pins 1 and 4 is open circuit ( switch is open)
The resistance value will vary on position of float.
With the float fully up ( full tank)
The value between pins 1 and 4 still open circuit
The value between pins 1 and 3 approximately 3 ohms.
So your float gauge should vary between 3 ohms (full tank) to 70 ohms (empty tank) approximately.
Brilliant. Thank you ....
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