Question about Garden
MTD Yard machine Model 13AO772H755, Briggs 15.5 42 inch deck
Tracking down fuel problems.
NOTE:The MTD Yard machine Model 13AO772H755, Briggs 15.5 hp engine does not have a fuel pump.Ignore all references to the fuel pump.However the rest of the fuel pathway should be checked just the same.Watch the video.
I knew this mower was in top running condition. There were no engine misses, no backfires. It was not abnormally hard to start. The carburetor was clean, the coils were good, the plugs and fuel filter were recently changed. Lifting the hood, I noticed the fuel filter was nearly empty. It should be ½ full, or more. I pulled the hose off the tank side of the fuel pump and saw there was no fuel flow.
Gas should gravity flow from the tank to the fuel pump, if the tank has a good supply of fuel. I wiped the hose off and blew air back into the fuel tank. It helps to take the gas tank lid off first. After I got a good flow of air going back into the tank (you can hear the bubbles) the fuel began to gravity flow back through the hose at a decent clip. This fixed the problem. There is likely silt build up in the tank and it settles at the output port blocking the flow of fuel.
The problem repeated itself several times last summer. Back at the shop, I used compressed air (turned down to 20 psi) to blow the line clear. The problem reoccurred this spring. I used the same method to clear the line.
NOTE: Connect a volt meter across the two battery posts. If battery voltage drops below 9 volts when cranking or while the engine is running, the fuel cut off solenoid will not function. That means the engine will not start or will die soon after starting. So check your battery voltage before, during, and after cranking. If the battery voltage is good before but drops below 9 volts while cranking this is generally a sign the battery has one or more bad cells. Replace the battery. If the battery is in fact good, and the voltage is still dropping, you may have a bad starter motor which is drawing too much amperage.
If you find this fuel checkup does not solve the problem, repost your question with updated info and I will walk you through the next step. Tracking down a spark problem; yes, your problem could involve the coil or any part of the ignition/spark system. (Not as likely as fuel)
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Posted on Apr 15, 2015
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Posted on Jan 02, 2017
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