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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4 > Fuel quality
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Thread: Fuel quality Reply to Thread
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Topic Review (Newest First)
04-27-2011 03:23 PM
RichH Maximum recommended change for a Racor is ~1 YEAR. This is due to the cellulosic filter media being 'digested' by any water in the fuel, which can greatly 'soften' & weaken the filter material. ..... or sooner if the vac/pressure gage show a 'noticeable' increase.
04-27-2011 02:49 PM
hellosailor Down, using Stabil won't affect the filters. You still change the filters either by the clock, or by the vacuum gauge (if you have one) showing that they are clogging up.
04-26-2011 04:55 PM
downeast450 Hello,

I am being over cautious, I guess. I did skip the pump out two seasons ago and had no problems. This year I moved the Racor and had things disconnected anyway. I have not been using the 2 year dose of Stabil. How often do you replace filters?

Down
04-26-2011 01:56 PM
hellosailor down, if you added the Stabil when the gasoline was new, and you used the "two year" dose of it per the label, you'll probably find your A4 quite happy to run on it when it is just one year old. I don't know what Stabil does, but I've noticed that it does it very well.
04-26-2011 10:03 AM
downeast450 That wonderful stuff that was a cheap solvent around the shop, ran lawn mowers and pickup trucks is now almost as dear as any other chemical we buy by the gallon. I "store" 20 gallons of gasoline in my boat's tank over the winter. I guess it is 18 gallons of gasoline and 2 gallons of alcohol here in Maine now. A full tank of old gasoline, even using Stabil, is what is waiting for my A-4 in the spring. I purchased a 12 volt fuel pump at the auto supply store ($15.00) and fuel line and fittings that allow me to pump that "old" gas out to put into my "old" 65' Chevy pickup. It takes me a little work to hook things up but it has become part of the spring fit out process. I am replacing filters anyway. The boat is on the hard and wide open. The wires for the pump are outside the boat and connected to the truck's battery. If I am concerned about the condition of the gasoline I can "rinse" the tank with an additional 5 or 10 gallons of gasoline, treated with MEK if necessary, that my "old" 283 Chevy will consume happily. It is gasoline I would buy anyway so it isn't "lost". It lets me start each season with fresh gasoline for the new filters. So far so good. It helps eliminate some concerns about dirty fuel.

Down
12-13-2010 07:31 PM
hellosailor cb, don't be shy. Tell us what kind of fuel it is, how many thousand gallons you've got, why you don't know what it is or where it came from...You know, give us the big picture and you'll probably get better answers.

Put a tablespoon of "fuel" in a black plastic lawn leaf bag, opened up all the way. Tie a knot in the big, keeping it fully inflated. Let it sit out in the hot sun for six hours from ten to four.

Now, touch a flame to the bag. If it goes BOOM and then there's this horrible ringing in your ears and scalded feeling on your face, the fuel is still good. For something, at least. (Same test works for gasoline and diesel alike.)

There are other tests, but none quite so simple.
12-13-2010 06:46 AM
HDChopper If you have an older eng designed for leaded gas it wont hurt to add lead additives IMO ... if older eng it would be best to overhaul the head for unleaded gas using stellite seats ect...

It wouldn't hurt to go to the local airport and get some av gas 101 or 110 oct. what ever thay got and run through it once in a while ....yes I know it's very pricy,
12-04-2010 04:43 PM
Piratesoul buy your gas at a gas station if your marina doesn't sell a lot
check your gas in the sediment bowel
use sta bil and an ethanol treatment additive
run engine for at least 30mins every week in drive
change fuel filter and clean sediment bowel every time you change the oil
12-03-2010 05:21 PM
pdqaltair
Quote:
Originally Posted by RichH View Post
Nice/useful posts on gasoline assays ....
Totally totally agree on the issue with 'gasoline caps'
I could have added that fuel additives are a different matter: biocides, cold-flow agents, and detergents really can work, as long as we understand they are for prevention, not cure-alls.

Also, gasoline additives for extended storage (Stabil and some other brands containing polyisobutlyeneamine functionality) (nitrogen, often smelling vaguely of ammonia, if you are alert) are proven to be effective.
12-03-2010 01:07 PM
RichH Nice/useful posts on gasoline assays ....
Totally totally agree on the issue with 'gasoline caps'
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