Water in fuel indicator light 97 F-250 - Ford Powerstroke Diesel Forum
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Old 04-12-2010, 01:13 PM
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Water in fuel indicator light 97 F-250

Does anyone know for sure if the water in fuel light is supposed to come on as a check when you are cranking the engine on a 97 F-250? I recently got a load of water contaminated fuel and while I think I have eliminated the water, I want to be sure my water in fuel warning light is working. My owner's manual says it should come on while cranking. It doesn't. A close look at the schematics in the Ford EVTM manual doesn't show me why it would come on while cranking. While in the start position, the ignition switch grounds the temp warning and fuel filter light circuits, causing them to come on. I see nothing similar for the water in fuel light. If someone who has a 97 F-250 could do a quick test, I would really appreciate it.
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Old 06-21-2010, 08:10 AM
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I was wondering the same thing. Mine doesnt "flash on" while on the start position. Can anyone confirm this light flashes on, while key in start position?
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Old 06-22-2010, 08:36 AM
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water in fuel indicator while cranking

Yes, it should come on. My problem was that the water in fuel switch(not the sensor) had failed. The water in fuel sensor looks like it is basically a bolt with insulation around the threads. I don't see how it can fail. The water in fuel switch is a small (roughly a 1 inch cube) solid state device that plugs into a wire bundle near the front of the engine. If your water in fuel light doesn't come on while cranking and you have verified that the bulb is OK then I would replace the water in fuel switch. I think it cost $30 to $40 at Ford. Once you have one to look at, you should be able to find it on the engine.
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