Wife was in Bangkok on the weekend and had to drive through a couple of flooded areas, when she got back home to Surat Thani she informed me that a light she didnt recognize had come on  when she was near Chumporn but as it was well after midnight I said we could check it in the morning. In the morning we started the car but the light didnt come on after several minutes of the car running so she showed me the light in the book, it was water in the fuel light. Not being up on car mechanics I was hoping someone in here could help with information on whether we need to have a mechanic check the car out to see if this could be a problem, many thanks for anyone that can clue me in on what to do.

hmm ... only thing I can think of, since not on again the following day, maybe driving through the water, and night air, with more water splashed up in the fuel tank underneath, cooled it enough to cause a bit of condensation in the tank, which the sensor noticed.  

Diesel or petrol engine ?

If it's petrol it doesn't cost much to a computer plug in diagnosis check. 

If it's diesel have the diesel fuel filter cleaned. 

2 hours ago, degrub said:

Diesel or petrol engine ?

ita a diesel engine, Nissan Navara Calibre Sportech

This one? 

 

There's a water trap lurking under the hood somewhere, it needs draining.

 

The manual will tell you where and how.

 

You might also want to replace the fuel filter.

 

1 hour ago, Kwasaki said:

If it's petrol it doesn't cost much to a computer plug in diagnosis check. 

If it's diesel have the diesel fuel filter cleaned. 

thanks mate

 

33 minutes ago, Crossy said:

This one? 

 

There's a water trap lurking under the hood somewhere, it needs draining.

 

The manual will tell you where and how.

 

You might also want to replace the fuel filter.

 

Not all need replacing just cleaning.

My Isuzu you can clean don't about Nissan. 

 

Could have been water on he sensor, or sensor wiring,, giving a false reading.  Sensor go wet when driving through floods, and dried out by the next day.

if you are really bothered, you could drain all petrol out of your tank and replace with new.  Water will be at the bottom of the tank, so should drain out first.

Look or any evidence of water in the fuel filters

6 minutes ago, Robin said:

Could have been water on he sensor, or sensor wiring,, giving a false reading.  Sensor go wet when driving through floods, and dried out by the next day.

if you are really bothered, you could drain all petrol out of your tank and replace with new.  Water will be at the bottom of the tank, so should drain out first.

Look or any evidence of water in the fuel filters

The OP  did say his fuel is diesel.