sphere wrote:
I was informed when I returned home from work that the gas cap was left off the Can-Am side by side ATV, and naturally it poured rain for hours. The gas tank opening sits partially recessed under the truck bed at maybe 45 degree angle, has no valve to prevent unintended debris/liquid from getting in when open, is approximately 2’ in diameter. The tank has roughly a half gallon of fuel in it currently. It’s hart to know if rain got in or how much but there’s certainly potential and I don’t want to foul up the engine and parts. Wife says it was raining hard from the opposite side (rain always comes from the south here, 9 of 10 times) and that she drove it maybe 1 mile since before realizing the cap was off. Looking at the structures above there isn’t anything I can see that would suggest heavy rain runoff would fall directly down into the opening so direct rainfall would likely be the only way water could have gotten in.
I’m inclined to fill the tank to dilute whatever may have made it in there and assume there isn’t much to worry about. But then again I’m an idiot so there’s that.
Thoughts?
Fuel pickup's in tanks are at the bottom, Gas floats on water. It would not take long before water coming in would get to bottom of tank. How long after rain did she drive it?
Everyone who is saying drain tank, I assume missed that she drove it. So now you are looking at the entire path, hoses, filters, the whole thing.
SO What if I do nothing.. Ice engines work by putting gas usually as some kind of spray or mist, into a cylinder, as cylinder is being compressed, when cylinder is nearly fully compressed, a spark is initiated, this causes the gas to burn, and the combustion gasses expand, pushing cylinder down.
Now if I spray water in there well it wont ignite for one thing so now power (maybe some gas gets in so reduced combustion). But even worse water is an incompressible liquid. Exhaust ports for fumes are at top of cylinder, water wont leave, as you run it the water builds in the cylinder, and eventually engine breaks.
Now more than likely (assuming she drove it 30 min or more after rains) and she did not experience any hesitation or rough running, (I think 1 mile of running was probably 5 min or so) water would have made it from bottom of tank into engine (guessing here, could probably do math and figure it out for sure, but I don't think you get 5 min from whats in filter and lines).
3 options I think.
Low risk, High work -- Drain the entire fuel system hoses, filters, engine, carburator?, tank.. dry out, rebuild, and fill. (zero chance of further damage)
Med risk, Low work -- Drain tank -- If she ran engine 5 min and after water had time to settle, its in the lines, this option is good for well I did something, but I think in reality, to late to really solve anything if water got in
High risk, no work -- Drive it like you stole it.
Just thought of another Med Risk, low work solution, go get some
K100 Fuel Treatment and add to tank, it bonds with/breaks up water in a tank.
great lots word, what are you saying.
In my best guess, if it was long enough after rain, and the engine was on long enough, any water in there is in they system. I don't think you have enough water in there to cause a hydro lock and blow up the engine. (assuming she did not notice any rough running / loss of power) You probably got minmal to no water in the system. I see 2 options, depending on risk tollerance, finances and mechanic skills.
I would either tear it all apart and empty all the fuel from everywhere (or pay someone to) . Or get some K100 add it to tank and then run engine, under no load (Idle it) for a 30 min or so to flush the k100 into all parts of system and get what ever water is in there out.
given my assumptions and general attitude about things being overhyped and feared, I would add the K100 and let it run say 1/4 tank through at idle. Probably continue to use k100 treatment for a couple tanks (water-rid is another, there are many products that do this) (not sure how much of a bottle goes into a small ATV tank, so maybe only 1 bottle needed).
Now if you tell me she did notice engine not running well.. yup full tear down.
side note, they sell the water remover because in tanks that sit, condensation can build up and add small amounts of water to tanks over time, this reduces / eliminates that water.
Good Luck
EDIT -- sorry just reread saw its a canam not ATV.. so 1 mile happened faster, but bigger engine.. Don't think it changes anything I said. Well probably a mechanic trip instead of DYI, but other than that. all the same.
Just Triing
Triathlete since 9:56:39 AM EST Aug 20, 2006.
Be kind English is my 2nd language. My primary language is Dave it's a unique evolution of English.