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Finale to Water-In-Gas story: Fuel filter.
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Posted by RayF (more from RayF) on Wed, 21 May 2008 11:20:08 Share Post by Email
In Reply to: Gee. Can't I use this vodka I bought?, RayF, Tue, 6 May 2008 16:36:01
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I was kinda lying when I reported above that the car ran "okay" after draining tank, adding lots of isopropyl alcohol and draining that out, then adding fresh gas.

It "ran" in the sense that it would start, sometimes stayed running at idle, and could be kept running if raced and once up to speed would hold running and not stall.

But it kept missing, badly, and that was a royal pain. It didn't clear even after several days driving and even more fresh gas, so I finally tackled the fuel filter.

IF you get lots of water into your gas tank, changing the fuel filter as Zig told me is vital. It sits horizontal, and is about the size of a coffee can, and the entire lower half of it can fill with water and it won't want to come out even if you pump the tank dry, or even with my strong flush of neat alcohol. It just sits there, in a trap, the lowest part of a system that flows past above it.

Or rather, it just sits there, waiting to mix with the good gas coming from the tank and passing thru the upper part of the filter. And then wreaks havoc in the combustion chambers.

The filter was new within a month so I resisted changing it. When I got time I took it out, lowered it into an oil drain pan, then out from under the car, I shook it till about all the gas and water I could get out of it drained into that pan. Then I put my mouth to it and blew till I stopped seeing much mist blow out the other end.

THEN I took an old vacuum cleaner and stuck its hose over the outlet and ran it sucking clean air thru the filter for about 20 minutes. By then it seems I had at last purged about all the water out of the filter.

I really needed the car then so I reinstalled it and the car immediately started and ran as right as it did before I started all this foolishness by pouring in the free gas with the water in it.

Since then I have burned about 10 gallons out of the 20 gallons of partly-watered gas I drained out of it, after separating it off the water in the bottom of the cans. That gas had a healthy mix of isopropyl alcohol in it but it has run flawless on it.

I separated off a total of about 5 quarts of water out of gas that was in the car, not counting whatever was still left in the filter.

One lesson I learned was, drygas hardly TOUCHES any real quantity of water in gasoline. It may mix with it in theory but in practise the water just sits at the bottom of things.

Second lesson was, NEVER trust free gasoline, but do dare to use it if you first run it into see-thru containers where you can see any water, then separate the gas from the water. I had watched as the gas I got ran thru a clear poly hose and didn't see anything wrong with it, and it smelled fairly fresh, not old and stinky.

So if anyone ever suspects or knows that there's water in their gas, first, DRAIN your tank (I did it as I've said by using my fuel pump, triggered by grounding the fuel pump relay's violet wire) and then CHANGE your fuel filter.

posted by 71.241.217...
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