3 Stroke Engine Troubleshooting – Spark okay, No Fuel
If your Small Engine gives a clear spark and the plug was wet, replace the spark plug and try starting the engine again with the choke off. If this doesn’t work try it with the throttle wide open as your engine may be flooded (too much fuel in the cylinder). If this is the case you also may pull the starter rope or hit the starter motor without the sparkplug a few times. When troubleshooting 2 stroke engines and the engine is flooded, you want to spin the small engine over fast with the throttle wide open several times. You should start to hear it pop, just keep pulling or kicking and holding it wide open until it starts, then rev the engine a bit to clean it out and keep it running, then warm it up properly.
If there is still no spark with a new spark plug, you have problems with your electrical system. Which could be the sparkplug wire, coil or on/off switch.
As you read all 3 episodes “Basic Small Engine Troubleshooting for 2 stroke engines” is assuming you have checked the basics, you know, gas is on, gas in the tank, choke is on. One quick check you can do is to pull the fuel line off the carburetor, turn the gas on for a second and see if fuel is flowing out the fuel line. If that is ok, then it’s most likely at this point you have something blocking the fuel inside your carburetor. There can be several causes of this:
- Water in the fuel.
- Old fuel evaporated gumming up the carburetor.
- Debris in carburetor plugging up the jets.
- Carburetor float stuck.
You have to use some common sense here. If this is a 30 year old motorcycle you pulled out of a barn somewhere, the carburetor will need to be removed and completely disassembled and cleaned. If this 2 stroke small engine is something that was running recently and have been filled with clean fuel, it may just have gotten moisture in the fuel or debris clogging up the carburetor jets. Most 2 stroke engine carburetors have an access plug or drain plug in the bowl on the bottom of them. Remove this plug, sometimes you need to loosen the carburetor and tilt it to access this, or even remove the carburetor from the small engine equipment. Let the fuel drain out and then open the fuel valve, (turn on the gas), for a few seconds. It should run clean gas out the hole in the bottom of the carburetor at a acceptable rate. If not, your float is stuck, you can sometimes “break” this loose by gently tapping on the side of the carburetor with the plastic or wooden handle of a screwdriver.
If you see anything remotely white colored in the fuel then there is water in the fuel system. If you suspect water entered the fuel, the fuel tank should be drained and start with fresh gas. Go to your nearest small engine workshop or check out The Small Engine Troubleshooter webshop and grab a bottle of fuel stabalizer. Add a bit of this to your new fuel to seperate the remaining moisture out of your fuel system.
When checked this last option your fuel system should run properly, if not your carburetor needs to have an overhaul probably.