It's the same with a furnace. It only quits when you need it.

 

Seems to me this is a key in resolving your issue. With your block heater unplugged for a while (or all day or even overnight) i.e. when the engine is cold, slide under your truck on your back just behind the front driver's wheel and touch the area just above and to the side of the oil filter (towards the front of the vehicle) You'll see a cord going into your engine block there ... that's the block heater cord. The area you touch should also be cold.

Then, plug in your block heater, wait for about 15 minutes or so (longer if you wish), then go through the same procedure (touching the same area). If your block heater is working, the area will feel warm to the touch. If its not working, it'll still be cold. That way you'll know whether your block heater is working or not. Next, you need to carefully look at your entire block heater cord to determine if it is the cord that is bad (it was on mine) or if you need a new block heating element ... or both. Of course, this assumes your power supply (via extension cord) to the block heater cord is working correctly.

 

On mine you don't even have to go touching the oil filter housing...if it has been plugged in a couple of hours, you can literally touch the cord near the front bumper (I always notice it when I'm unplugging) and it will be warm to the touch. Not hot, but warmer than ambient temps.

 

In winter my outside temps get down to about 32 degrees.My truck is in my garage, about 52 degrees.
Do I need to plug in my block heater?
Or is there really no needed benefit to it?
Thank you.

 

I never plug in unless it's below zero.
The fire department and ambulance services keep their rigs plugged in year around, but then they have to go from zero to hero with no warmups.
My personal opinion is that you should not need to plug in ever at those temps.

 

 

I am looking for info on a 2000 f250 7.3 I am trying to replace the water in fuel sensor module. did it several years back but don't remember the location. last time I took the complete glow plug wiring harness apart, don't want to do that again. It was either in the valley of the motor or it was under the fuse box. can someone give me the location so I don't have to take everything apart. Thanks

 

Water in fuel sensor is in the bottom of the fuel bowl. The connector is on the back of the fuel bowl down in the valley. Unplug it and and leave it. It's not needed.

 

No , Water in fuel sensor module it's square and plugs into the glow plug harness

 

HD Rider is correct, I don't know what you are looking for.

 

Yes HD rider is correct about the water in fuel sensor. However I am seeking info on the water in fuel sensor MODULE it takes the signal from the sensor and distributes it to the glow plug wiring harness and to the light in the dash. when it malfunctions you get false reading (whether the sensor is plugged up or not) and the ending shuts down.

 

that's a new one on me.

 

I had this same problem the first time. No one would give me info so I ended up opening the entire wiring harness. I guess this time I should mark where it is.

 

There is another thread "7.3 water in fuel module wiring info" You can see a pic in that thread

 

I think you're looking for a module on an IDI.