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How to Store Equipment Away for Long Term, Like Winter

Joseph Coupal - Tuesday, December 13, 2011

As 2011 draws to a close many of our customers will be storing their STIHL products for the season. Fuel-related problems are among most common issues that STIHL customers have.

Now Let's Talk About Gasoline

The gasoline we buy at the pump is not the same as what we bought 10 years ago. Gasoline is a complex chemical soup that must meet standards set by the EPA regarding the pollution created when the fuel is used in an internal combustion engine. Nearly all the fuel sold today has at least 10% ethanol added. The primary use of gasoline today is for licensed vehicles used on public roads, like cars and trucks. Today the majority of these vehicles are fuel injected with a computerized engine management system that tunes and adjusts the engine to the fuel as the vehicle is being operated. The fuel companies blend this fuel to meet EPA standards for these vehicles.

Today's gasoline is even blended differently by region and at different times of the year to help with cold and hot starting in your car or truck. It is expected that gasoline delivered to a gas station will be sold and used within two or three weeks.

Most small engines manufactured today, for lawn and garden applications as well as small outboards and recreational vehicles, still use carburetors to mix the fuel with the air for the engine to run. The challenge for small engine manufacturers has been to build their products to operate properly on gasoline blends that keep changing. This has lead to such things as materials compatibility. Here is an example: take an engine that is a few years old and ran fine last season, but now will not start. When the unit is evaluated by a service technician at the dealership, they may find that the fuel line was found to be hard and brittle and had crumbled away, or it may have become soft and spongy and simply collapsed so no fuel can flow through it.

In some cases the carburetor itself may be damaged by the fuel, clogging jets or damaging rubber or polymer components that the fuel comes into contact with. They may swell or shrink, causing problems that prevent the machine from running correctly. It is easy to blame some of these problems on the ethanol that is mandated by the EPA to be added to most fuels, but there may be other additives in the fuel that could be a cause of these problems as well, especially in older machines.

Available Options

So what should you do to make sure your small engine will start when you want it to? There are some options available. They may require spending more money on fuel, or more time in preparing the machine for off-season storage, but the cost of not doing these things will be down time and a repair bill to correct the problems.

STIHL continues to make changes to the polymers and the carburetors used on current products to help prevent this sort of thing from happening. We do have some recommendations to help prevent starting problems for anyone with a small air cooled engine equipped with a carburetor, regardless of how old it is.

The most important thing you can do is buy name brand (89 or higher) octane fuel. The reason is that name brand fuel (Shell, EXXON, BP, CITGO, etc.) is blended more consistently and should be fresher and of a higher quality than fuel bought at a retailer with no brand on the pump.

Only buy enough fuel to last you a month at a time. The shelf life of today's gasoline is not as long as it was in years past. Fuel does "go bad" over time and will change color and eventually have a sour odor. This can happen much faster if the fuel container is open to the atmosphere, as in some older gas cans that do not seal out the air.

Some older gas cans have a little plastic vent that you would open to allow the fuel to pour out, and often it will break off and the oxygen in the air can get inside the gas can and start a process called "oxidation" that will rapidly degrade the fuel. Always use a clean fuel container and consider buying a new one that has a positive sealing dispensing cap and an automatic vent.

In high humidity areas, the ethanol additive in the gasoline will rapidly absorb moisture from the air and "phase separation" can occur. This will cause the water and ethanol to settle at the bottom of the container. When the can is tipped up to fill the tank, the water and ethanol will flow into your machine's fuel tank possibly causing a non-start condition. In a worst case scenario, this can actually ruin the carburetor or even cause internal damage to the engine.

Do not use a "winter"-blended gasoline you bought in January in June, as it may cause lean running, vapor lock, hard-starting and could also lead to internal engine damage.

Another suggestion that you might consider is to add a fuel stabilizer, such as STABIL. Be sure whatever brand you buy does not have any alcohol in it. A fuel stabilizer will not fix old gasoline but it does help lock down the chemistry of fresh gasoline so if it does sit in your gas can for a month or two, it should still burn properly when you use it. But remember that adding a fuel stabilizer does not make your gasoline last forever, just longer than it would without a stabilizer added. Some two-cycle engine oils have stabilizers as part of their chemistry, which makes it convenient to have a stabilizer in the mix.

Use a dedicated two-cycle fuel can. If you have a two-stroke engine such as a chain saw, leaf blower, or trimmer, use a fuel can just for two-cycle mix, and label it clearly. We suggest using the best quality oil from the manufacturer of your particular machine, and put the oil in the can before you add the gasoline so that it mixes better and there is no chance of forgetting to add it later.

Another option is to buy pre-packaged fuel for your two-stroke equipment. STIHL markets MotoMix® which is a 92 octane fuel with synthetic oil already added at a 50:1 ratio, and there is no alcohol of any kind present. Additionally this fuel will remain stable and useable for up to two years after the seal on the container is broken as long as the cap remains tightly sealed. While this option is more expensive up front, the payoff will be no downtime or repair bills down the road. This may be a good idea for someone that uses their equipment only occasionally, like a homeowner, fire department, rescue squad or farmer.

Prepare it for long term storage. Finally, no matter what gasoline you use, the most important thing to do when a machine is going to sit for any length of time, say over three or four weeks, is to actually run it out of fuel. Carefully drain the fuel out of the tank if it is not near empty, and save that fuel or dispose of it properly. Now start the engine and let it run at idle until the engine runs out of gas and stops. Don't rev the machine, just let it idle. This will do more than anything else to help mitigate starting problems the next time the machine is put into service. There will always be a little gasoline left in the carburetor, so this is why it would be best if the gasoline had some stabilizer in it, or for a two-stroke, a product like MotoMix®.

Remember, selection of fuel and proper mixing is your responsibility. Use a name-branded fuel and two-cycle mix, and follow the information above. Your machine should be ready when you are. If you have questions, contact us by calling 774-987-9399 to speak with our experienced technicians.

Leaf Blower Repair

Joseph Coupal - Tuesday, July 26, 2011

Of course it is only July, but soon enough you are going to have to get out the leaf blower. Leaf blowers propel leaves and other lawn debris by creating winds of up to 180 miles per hour. Whether you're using a back-pack, engine- driven model, or a motor-driven hand-held unit, these small machines make life in Massachusetts much easier in the fall.

Often times, after seasonal storage, we take out our small engine machines to find that they just won’t start.  Sometimes, they were failing at the end of last season, but we tucked in the garage in hopes that when we took them out again they would work.

J&J Small Engine Clinic, Inc. Specializes in Service and Repair of small engines.  We believe in complete and thorough repairs done right the First Time.


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