"Water in Fuel" Flickers After 1st Biodiesel Fill-up - Ford Powerstroke Diesel Forum

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post #1 of 7 Old 03-10-2014, 09:57 AM Thread Starter
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"Water in Fuel" Flickers After 1st Biodiesel Fill-up

Hey Board,

After talking to some folks here and doing other research, I decided to run biodiesel in my 1996 7.3l Powerstroke. Yesterday I went to a nearby Propel Biofuels station on two quarter full tanks of petro, and filled them both with B75 from their pump.

I drove five miles or so with no issues, stopped for a couple hours, then drove four or five more miles. Engine ran the same, but towards the end of the second leg the "water in fuel" light flickered on briefly as I climbed a hill. This was maybe a quarter mile from home, and it blinked again and then seemed to go on steady when I stopped in the driveway.

Any thoughts on this? I know the bio has a solvent quality that can break down gunk. Could water have been released from somewhere, or maybe the sensor got clogged?

I think I was at the bottom of the pump's tank, too, if that makes a difference. It seemed to slow a lot at the end of the second tank.

This fuel is supposed to be a quality product, so hopefully it's not truly water in the fuel tank, but a false reading of some kind.

Thanks!

- DC
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post #2 of 7 Old 03-10-2014, 04:11 PM
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its not water. water "sensor" doesn't really sense for water, it senses for obstruction so yeah the biodiesel is cleaning up your system. It would be easier to tell what was going on with a fuel pressure gauge but just make sure you have a filter ready.

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post #3 of 7 Old 03-10-2014, 07:29 PM Thread Starter
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Ok, thanks for the reply. I called Propel and they said that station has been kept above half full, and that they have other filters for dealing with water as a stopgap anyway, so it sounds like the fuel is probably fine.

I'll just keep running it through and keep an eye on the filter.
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post #4 of 7 Old 03-11-2014, 04:51 AM
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I would do one simple thing...

I would open the fuel bowl drain with the Key on. Engine off. cycle a few times to be sure the pump is running.

Water is a possibility. Eliminate it with the drain. Just as a precaution.

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post #5 of 7 Old 03-15-2014, 07:50 AM
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Only problem there is its a mechanical pump unless you have done an e fuel swap....but then the bowl would be gone anyway. But I see what veggin is getting at

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post #6 of 7 Old 04-16-2014, 10:44 AM Thread Starter
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Well the light kept up intermittently and was getting worse. I finally drained the bowl, which was so easy I can't believe I didn't do it sooner. I did it with the key off, but plenty came out. What drained out appears to have some water in it -- maybe a tablespoon or two -- so it seems the sensor was doing its job after all. (The tub was already dirty, so not all that gunk came out.)



So now of course I'm worried how badly I could have corroded something by waiting. =\
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post #7 of 7 Old 04-18-2014, 03:29 AM
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The owner's manual recommends periodic draining of the fuel bowl for this very reason.
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