Fuel Filter light turned on?

Tiny
BETH-2844
  • MEMBER
  • 2007 MITSUBISHI SHOGUN
  • 4WD
  • AUTOMATIC
  • 133,000 MILES
Hi,

The fuel filter light came on, so I emptied the fuel filter of any water, the light came back on 2 days later. I performed the above again, however the light came back on just after a day. Fuel filter has been replaced and after a day and a half the light has come back on. Could this just be a faulty sensor or is there an underlying issue?
Sunday, December 4th, 2022 AT 2:24 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

This vehicle isn't offered in the US, so I have little information on it. However, I will try my best to help.

Based on your description, I believe this has a diesel engine. Is that correct? Also, are you located in an area that has cold temperatures that tend to warm up throughout the day?

As far as a sensor, does it have one that attaches to the filter? See pic below, if so, disconnect the sensor wiring. It should have two wires. Connect a multimeter to it for testing continuity and attach one pin to each connector pin. You will see a specific amount of resistance. Move the level float on the sensor to see if there is a change in the resistance. If there is no change, chances are the sensor is bad. If there is a change, confirm there is power and ground to the sensor on the engine wiring connector.

I suspect you should find a 5v reference signal to the power side. The sensor will change the resistance which signals the ECM when there is a concern.

Please understand, I'm not familiar with this specific vehicle. The information I provided is a general rule that I follow when testing this type of sensor.

Let me know if it helps.

Take care,

Joe

See pic below.
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Sunday, December 4th, 2022 AT 8:08 PM
Tiny
BETH-2844
  • MEMBER
  • 2 POSTS
Hi,

Thank you for your response.

It is a dowel engine yes and I am located in an area that is cold and tends to warm up through the day.

I will perform what you have suggested and see if this helps.

Thank you.
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Monday, December 5th, 2022 AT 12:52 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

I had a feeling. The temperature changes can create condensation. Let me know what you find.

Take care,

Joe
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Monday, December 5th, 2022 AT 2:21 PM

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