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post #1 of (permalink) Old 10-29-2002, 12:03 PM Thread Starter
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Fuel/Water Separator/Filter.....

I purchased another fuel/water separator (marine grade) and in the instructions it states that it shouldn't be used with an electric fuel pump as it could cause poor running or a lean condition. Can anyone shed some light on this?
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post #2 of (permalink) Old 10-29-2002, 12:11 PM
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Re: Fuel/Water Separator/Filter.....

:ahem: well, the fuel/water separator would disrupt the magnetic lines of flux in the electronic fuel pump, causing excessive heating, and reduced flow, resulting in coriolis backpressure, amplified by the thermal coefficient of expansion of gasoline, causing detonation in the fuel lines, and...

I mean, beats me, I have no idea... [img]images/graemlins/wink.gif[/img]
post #3 of (permalink) Old 10-30-2002, 05:46 AM Thread Starter
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Re: Fuel/Water Separator/Filter.....

I think can avoid the afore mentioned hazards by wrapping the fuel line with 25' of shore line.......

On a serious note, I'm guessing the electric fuel pump (being a "blower type of pump) can't handle the "resistance" created by the filter which might "starve" the motor of fuel. Just a guess..... I'll have to ring the manufacterer.........
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post #4 of (permalink) Old 10-30-2002, 05:49 AM Thread Starter
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Re: Fuel/Water Separator/Filter.....

BTW....On the packaging, it states the it will fit all motors, yet after purchasing and opening it up AND reading the instructions, it states that it shouldn't be used with an electric pump..... Geez, imagine that?..........
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post #5 of (permalink) Old 10-30-2002, 06:46 AM
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Re: Fuel/Water Separator/Filter.....

Hey Crow,

This just occurred to me - what if you're not supposed to use it with an electric motor, because the typical EFI pump produces TOO MUCH pressure, and would damage it?

Sounds like a call to the vendor is in order!
post #6 of (permalink) Old 10-30-2002, 06:54 AM
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Re: Fuel/Water Separator/Filter.....

The problem with water separators or collectors is that they can plug pretty easily . Electric pumps, unless they are a rotary type racing pump are unable to overcome the resistance from these filters . One good solution for this is to get a pressure sending unit compatible with gasoline and plumb it inline after the filter . With a sending unit with a turn-on pressure of 5psi, it could turn on a dash warning light to let you know of a low pressure condition , hence a plugged filter . You could use a 1/8NPT tap tee, and a 1/8" sender inline or even plumb it off the water seperator's outlet pipe fittings . Basically, the same setup as you would use for a guage . Those sending units work off the ground side, so a simple idiot light system would work fine . Hope this helps,
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post #7 of (permalink) Old 10-30-2002, 10:40 AM
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Re: Fuel/Water Separator/Filter.....

Jezzus Crow. A water/fuel seperator? For real? Most outboard boats don't even have one of those. Have you gotten water in your tank (other than from a bad station)? Is your fuel systems instact and sealed? Then it would remind me of an old saying,

"If it ain't broke, don't fix it."

Have you plumbed all four of your case and diff breathers up to the engine bay?
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post #8 of (permalink) Old 10-30-2002, 03:48 PM Thread Starter
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Re: Fuel/Water Separator/Filter.....

I've had a problem with water several times. About a year ago I replaced the original tank as there were rust particles appearing in the filters. On the way back from Zookin, not only was water visible in the filter, but some pretty funky looking crud. The crud even got past the filters and plugged up one of my idle jets making idling near impossible. Once home, I blew the jets out, replaced the filters. Presently, all is well, but I'm tired of finding getting funky gas on the road, so the fuel/water separator seemed to be the answer.
The fuel system is closed and there aren't any breaches in it. I just want a bit of preventative medicine, as well as good medicine.... [img]images/graemlins/smile.gif[/img]
I'm working on plumbing the diffs, tranny/t-case into a breather system. I don't traverse deep water, but again, I'm a proponent of crisis prevention......
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post #9 of (permalink) Old 10-30-2002, 04:07 PM
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Re: Fuel/Water Separator/Filter.....

Sorry to hear of those problems. But it is rare, especially in a good system. I doubt it will rear it's head again, unless you get bad gas again.

In that case, I can see you wanting added protection. Unfortunately, the marine one might be a little too restrictive. I doubt the larger ones on heavy machinery will be better. you would need to find one that will work with the electric pump.
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