Water In Fuel Sensor Leaking? - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 11-18-2006, 11:50 AM Thread Starter
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Water In Fuel Sensor Leaking?

Pretty sure this is the WIF/Water-In-Fuel Sensor but after researching someone else called it a vacuum sensor or something. Anyway, it's an 1/8" NPT Thread, goes in horizontal on the driver's side of the fuel filter housing. In front of it is a Schrader valve. This has a 1-wire connector that is a bullet style terminal. This is a plastic sensor incased in a metal body and male thread.

Anyhow...this thing started leaking. I don't know if it has to do with the fact that I was lazy and it was cold last night so I went to a drive through car wash or what. But this morning when I was about to head out on a 2 hour trip to visit my grandfather, I noticed dripping from the engine while I had it running. I crawled under the truck to see what it was, and it was certainly diesel fuel. It's never done that before. So I popped the hood and the engine cover and saw that sensor leaking between the plastic and the metal part. I pulled the sensor out and cleaned it up, put some new PTFE tape on it. I also drained the filter. I reinstalled the sensor and started the truck up. It didn't leak as bad, but it was still dripping every 5-6 seconds.

I never saw the WIF light come on, not last night in the car wash, not this morning, matter of fact it's never come on...maybe it's my religious maintenance, but either way...it never came on.

Anyhow. If this IS the water in fuel sensor...can it be temporarily plugged with an 1/8" NPT Plug? All it does is tell the stupid light when to come on right? Also...does anyone have a part number for this sensor so I can pick one up or order one this week?

Thanks.

-Jeremy-
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post #2 of 16 Old 11-18-2006, 12:18 PM
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I've noticed a little fuel in the valley of my motor. Let my know what you find out. Good luck.

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post #3 of 16 Old 11-18-2006, 06:00 PM Thread Starter
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Put a $.64 pipe plug in it for now, everything seems fine. Found the Ford part number, will get a new WIF Sensor next week.

-Jeremy-
- '96 F-250 XLT ExCab PSD 4x4 5-spd
- '98 Ranger XLT 2WD
- '83 F-250 XLT 2WD 351W
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post #4 of 16 Old 11-18-2006, 09:49 PM
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If it is the sensor that is on the drivers side top of the fuel filter housing, it is the restriction guage that turns the fuel filter light on. The WIF sensor is towards the bottom of the filter housing on the drivers side.

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post #5 of 16 Old 12-27-2006, 10:54 AM
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I just had the same problem on mine and I also just plugged it everything looks fine and no more leaks!!!!!

Later,

DEVLYN
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post #6 of 16 Old 12-28-2006, 06:14 AM
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Mine is doing the same thing. Let me know the PN# if you decide to replace it in the meantime I am going to plug it. Exactly what size plug is it?
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post #7 of 16 Old 12-28-2006, 04:52 PM
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1/8" NPT (national pipe thread)
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post #8 of 16 Old 12-29-2006, 05:21 AM
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Vacuum sensor leak

That did the trick! Thanks for the reply. Still would like the PN# for the sensor to replace it some day.

Thanks again.
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post #9 of 16 Old 01-25-2007, 05:18 PM
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Quote:
Originally Posted by SuicideAxles View Post
Pretty sure this is the WIF/Water-In-Fuel Sensor but after researching someone else called it a vacuum sensor or something. Anyway, it's an 1/8" NPT Thread, goes in horizontal on the driver's side of the fuel filter housing. In front of it is a Schrader valve. This has a 1-wire connector that is a bullet style terminal. This is a plastic sensor incased in a metal body and male thread.

Anyhow...this thing started leaking. I don't know if it has to do with the fact that I was lazy and it was cold last night so I went to a drive through car wash or what. But this morning when I was about to head out on a 2 hour trip to visit my grandfather, I noticed dripping from the engine while I had it running. I crawled under the truck to see what it was, and it was certainly diesel fuel. It's never done that before. So I popped the hood and the engine cover and saw that sensor leaking between the plastic and the metal part. I pulled the sensor out and cleaned it up, put some new PTFE tape on it. I also drained the filter. I reinstalled the sensor and started the truck up. It didn't leak as bad, but it was still dripping every 5-6 seconds.

I never saw the WIF light come on, not last night in the car wash, not this morning, matter of fact it's never come on...maybe it's my religious maintenance, but either way...it never came on.

Anyhow. If this IS the water in fuel sensor...can it be temporarily plugged with an 1/8" NPT Plug? All it does is tell the stupid light when to come on right? Also...does anyone have a part number for this sensor so I can pick one up or order one this week?

Thanks.
If I remember correctly, mine was leaking and I put a plug in it and never replaced it. It's been a while buit it sounds like the one you are talking about.

'96 F350, SRW, 4 door. Fresh air intake, SCMT, Oilguard bypass filter, aux transmission filter, new downpipe.
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post #10 of 16 Old 02-04-2010, 07:59 PM
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I have a 94.5 PSD i have a sensor on my fuel housing on the back middle of My fuel housing with a post connector would this be the same thing?

1997 F-250 4X4
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