Fuel SolenoidĪ fuel solenoid is an electromagnetic valve that simply opens as you turn on and run the mower engine. Carburetors do wear out and I replace lots of them. Sometimes it’s better to just go ahead and replace the whole unit. OEM – Carburetors aren’t expensive or difficult to fit. Mower won’t start Runs rough Blowing black smoke Starts then dies Surging Lacks power Only runs with choke Gas leaking into the oil Blowing white smoke engine revving up and down by itself Mower only runs on choke” Mower blows white smoke. If that is the case your symptom will fit one of the following descriptions: Carburetor Fault FindingĪt this point, it’s assumed that you have run the Gas Shot Test and Choke System Check, and they both confirmed a fueling fault. If any of these sound familiar, you are in the right place.
You’ll find a link to the gas stabilizer I use here on the “Small engine repair tools” page. You can use it all season, I only use it at the end of the season and when winterizing. It can be used in all gas-powered kit including 2 stroke engines. I use a product called Sta-bil gas treatment, 1 ounce treats up to 2.5 gallons, it prevents gumming and cleans the fuel system. To prevent this from happening I use a gas stabilizer at the end of the season, mixed with the gas, it’ll keep it fresh for up to 2 years, so next spring it’s pull and mow. The result is gumming and rust – it’s a carb killer. The ethanol blend attracts moisture and the alcohol content in the gas evaporates. Typically, the small engine is put away for winter with the gas still in the tank. How Does it Happen?Įthanol fuel is blended with regular gas, that’s not a problem for cars, but it is for small engines. Cleaning usually solves the problem, but if it’s bad, don’t waste your time cleaning, just go ahead and change out the carburetor. A good cleaning and fresh gas fix most carburetor issues.īasically, it’s old stale gas that turns to a sticky gel, it clogs up the tiny passages of the finely balanced carburetor. The videos walk you through the whole process – removing, stripping, cleaning, reassembly and refitting. It’s all covered here in this post or you can check out the “Carburetor bowl draining video” and also “Carburetor cleaning video”. Very often, 5 minutes spent simply draining the gas bowl fix carburetor problems. There are many components in the fuel system that can cause issues but by far the most common fault – Carburetor contamination. Although this guide covers a tractor mower carburetor repair, it will work for all small engine four-stroke engines, they all run very similar gas systems. This guide will help you diagnose and fix your fault quickly. Air filter – Can block causing no start or poor running with black smoke.Refueling can – Often the source of the dirt.Intake manifold – Leak, causing engine surging.Fuel solenoid – Fail, stopping fuel flow (Not fitted to all mowers).Carburetor – Block, under fuel and over fuel causing no start or poor running.Pump – Fail causing a no start (Not fitted to all mowers).Fuel filter – Block or slow fuel flow to the engine.Lines – Leak at connection points and on occasion can block stopping fuel flow.
Cap – Cap allows the tank to breath, when the cap vent fails it seals the tank stopping fuel flow.
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