What is it?

[Noiseydiesel]

Behind the alternator next to the fuel filter above the engine.
1994 7.3 turbo in an F350 dually

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[Garbage_Mechan]

If it is about 1 inch by 1 inch, has no mounting tab or bracket and has a wire connector then it is the water in fuel module.

 

[Noiseydiesel]

Thank you. Next time I get the camera out I will have another one.

 

[Va_Mike]

Not to hijack this ... but I have been researching this part for a couple days trying to figure out what it is. The 1990 f250 I am trying to get running has the water in fuel light on, but this module from what I can tell it has a circuit board that is sealed in with some kind of clear epoxy. All the clear has melted out. What could cause this?

 

[chillman88]

Not to hijack this ... but I have been researching this part for a couple days trying to figure out what it is. The 1990 f250 I am trying to get running has the water in fuel light on, but this module from what I can tell it has a circuit board that is sealed in with some kind of clear epoxy. All the clear has melted out. What could cause this?

This module is some kind of amplifier for the water in fuel light. If its melted I would assume it probably overheated for some reason and probably needs to be replaced for the light to function properly. Personally I just removed mine because it was all cut up.

 

[Garbage_Mechan]

I have had IDI fleet and personal trucks since 1990. In all that time I have had the water in fuel light come on legitimately maybe twice. Granted CA has less issues with water in fuel than most states.
If you are meticulous, fix it. If you don’t mind a tiny gamble don’t fix it. On my personal rigs the sensor was not installed on the first filter change since I use the Baldwin filter with no bowl or sensor port. No issue yet.

 

[Macrobb]

Just remove the module for now, and make sure it didn't short out the power to the fuel shut off solenoid on the IP, or the truck will never run.

 

[Garbage_Mechan]

Yes I should have mentioned that. Not fixing it includes removing the defective module and cleaning up the mess so things don’t short out.

 

[Va_Mike]

I'm going to remove it then. This truck is set up with the large Baldwin water separator aft under the bed and has a standard no bowl Baldwin separator in the normal location under the hood. So I'm not really worried about water making it to the motor. Plus diesel fuel in my area never sits in a tank long at a station due to the amount of truck traffic here so not real worried about getting water at the station either.

 

[Macrobb]

I'm going to remove it then. This truck is set up with the large Baldwin water separator aft under the bed and has a standard no bowl Baldwin separator in the normal location under the hood. So I'm not really worried about water making it to the motor. Plus diesel fuel in my area never sits in a tank long at a station due to the amount of truck traffic here so not real worried about getting water at the station either.

Also, these trucks are a lot less likely to have issues if you do get water into it. Generally speaking what happens is the engine just sputters and dies(with sufficient water) and you have to bleed it out. None of this "Oh, I got a few drops of water in there... need to replace HPFP+lines+injectors at 10K+!"

I've had my sensor disconnected for a long long time, mainly because I got the "one piece" style replacement filters which are cheaper without the sensor.