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Old 01-11-2017, 02:58 PM   #31
Cole
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Default Re: Water in Fuel Light WIF warning is on.

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Originally Posted by Aqua Puttana View Post
I didn't know that this question was left hanging.

To my knowledge, all MB WIF sensors are installed or integral to the OEM style fuel filter. The NCV3 fuel filters that are more expensive than others have an integral non-replaceable WIF sensor.

vic
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FWIW, I found that my *new to me* 08 had he wrong fitting on the top of the factory fuel filter. So it wasn't firmly attached. Looks like someone changed out the filter at some point with a later style and didn't bother to change the fitting.

I replaced the filter and the fitting. Problem solved. (That one anyway)
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Old 01-16-2017, 08:36 PM   #32
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Default Re: Water in Fuel Light WIF warning is on.

Does it come on in a heavy rain? Its happen to me twice I shut it down and waited until the rain let up and when I restarted it .....bingo light was gone, five months ago same condition pouring monsoon type rain light came on again.pulled over shut down and restart no light waiting on the next rain storm.I realize the dealer missed an opp to relive me of some cash.Maybe the next time I'm sure there a light waiting to come on somewhere in my future.It seems it part of the there (M/B) game plan i.e.

Last edited by buddyma; 01-16-2017 at 08:45 PM. Reason: correction
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Old 01-16-2017, 08:40 PM   #33
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Default Re: Water in Fuel Light WIF warning is on.

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Does it come on in a heavy rain?
Not sure if you were addressing me. I'm in Colorado so there is no such thing as "heavy rain"
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Old 01-17-2017, 12:37 PM   #34
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Default Re: Water in Fuel Light WIF warning is on.

Its a condition that I get in heavy amounts of rain that falls from the sky.Beening from the Mile High City you get it in the form of that white stuff.Not to confuse the white stuff with that green stuff that been sold in your state.Thanks for the reply.If anyone else gets this condition please let me know.
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Old 01-17-2017, 12:47 PM   #35
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Default Re: Water in Fuel Light WIF warning is on.

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Originally Posted by buddyma View Post
Does it come on in a heavy rain? Its happen to me twice I shut it down and waited until the rain let up and when I restarted it .....bingo light was gone, five months ago same condition pouring monsoon type rain light came on again.pulled over shut down and restart no light waiting on the next rain storm.I realize the dealer missed an opp to relive me of some cash.Maybe the next time I'm sure there a light waiting to come on somewhere in my future.It seems it part of the there (M/B) game plan i.e.
That almost screams of a harness or connector letting water get in across the monitoring circuit. The circuit doesn't care whether the water is trapped in the filter or not.

I would carefully inspect all the harnesses for wear points and make certain that electrical connectors are intact (seals in place?) and properly seated.

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Old 01-20-2017, 12:14 PM   #36
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Default Re: Water in Fuel Light WIF warning is on.

Thanks I'll check the wiring and the connectors,Now that winter has come I've that that I get a lot of cold air int the area of the radio it appears I'll have get the under the dash to locate the leak,I used a bright light on the firewall but didn't see it looking from under the dash.Oh well maybe my new ford well be builted better.

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Old 04-19-2017, 02:13 PM   #37
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Default Re: Water in Fuel Light WIF warning is on.

From Chevron
https://www.chevron.com/-/media/chev...ech-review.pdf

***************
Is the color of diesel fuel an indication of its quality?
The color of a diesel fuel is not related to its quality. As long as the fuel meets specifications,
it will perform well in your engine. The natural color of diesel fuels has traditionally varied
from colorless to amber. As refinery processing of diesel fuel increased to remove sulfur,
the color tends to get lighter and the diesel can change color. When it changes color, the
diesel is typically light in tone and can be green, orange, or pink. Sometimes it might
show a slight fluorescence when held up to light. Such a change in color does not affect
the quality of the fuel.

(vic comment - Cloudiness can indicate fuel quality issues.)



Does diesel fuel plug filters?

A plugged filter can be caused by several reasons. For example, if summer diesel is used
during cold weather, low temperature can cause wax crystallization, which can lead to
filter plugging. Dirt in the fuel or excessive microbial growth can also cause filter plugging.
The latter are “housekeeping” issues and are not directly related to the fuel itself.
Under some circumstances, a fuel with poor thermal stability can plug a filter. When the
fuel is exposed to the hot surfaces of the injectors, it forms particulates. If the fuel system
is designed to return a significant proportion of the fuel to the fuel tank, the particulates
are also returned. When the fuel is recycled, the fuel filter collects some of the particulates.
Over time, particulate buildup plugs the filter. This problem has been observed for
engines that were operating at high load and, therefore, engines that were operating at
higher than average temperatures.

*****************

Anyone who wants to increase their knowledge of diesel should review the Chevron PDF. There's lots of good information there.

vic
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16 ounces of unnecessary prevention can be worth a pound of manure.

Last edited by Aqua Puttana; 03-28-2018 at 11:32 PM.
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Old 07-03-2017, 11:28 AM   #38
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Default Re: Water in Fuel Light WIF warning is on.

Folks that are worried about water in the fuel can get a Baja filter.

Slows down fueling a bit , but way faster than replacing a MB fuel filter, by the side of the road.

Usually under $20. or so, here is one , there are plenty to chose from.

https://www.amazon.com/Mr-Funnel-AF3...9SYJAXZ8GJ7YDM
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Old 07-03-2017, 12:36 PM   #39
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Default Re: Water in Fuel Light WIF warning is on.

My water in fuel light issue turned out to be a bad sensor.

The local Mercedes dealer had 6-7 of them in stock. Dealers donít stock parts they arenít replacing often
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Old 07-03-2017, 12:49 PM   #40
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Default Re: Water in Fuel Light WIF warning is on.

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Originally Posted by Cole View Post
My water in fuel light issue turned out to be a bad sensor.

The local Mercedes dealer had 6-7 of them in stock. Dealers donít stock parts they arenít replacing often
Not that anyone asked...

Sensor failures and harness problems can give a false warning. My course would be to at least use the water drain feature to get a fuel sample into a clear container for visual inspection. To just assume that the warning is a bad sensor can have some serious negative consequences.

vic
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Anyone can hold the helm when the sea is calm. Publilius Syrus
"There are only 10 types of people in the world: Those who understand binary, and those who don't." HaWiiLuVeR
16 ounces of unnecessary prevention can be worth a pound of manure.
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