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HomeRepair HelpMurray Mower RepairMurray Lawn mower won't start Repair
Murray Lawn mower won't start
If your Murray lawn mower won't start, begin with the parts most likely to stop ignition or fuel delivery. The first thing to check is the spark plug. If the insulator is cracked, the electrode is damaged, or the tip is carbon-fouled, replace it. A spark plug tester will tell you quickly if the plug is actually producing spark while the engine is cranking. If spark is good, the next most common cause is a clogged carburetor from stale fuel. This is a very common reason a lawn mower not starting or a push mower won't start after sitting. Try carburetor cleaner first, then rebuild it with a carburetor repair kit or replace the carburetor if needed. Old gasoline left in the carburetor float bowl can create the same no-start problem, so drain bad fuel if necessary. After that, check the start switch for continuity with a multimeter, and inspect the fuel pump, including the pulse line, diaphragm, and check valves. Enter your Murray model number on RepairClinic.com to find the exact replacement part that fits your mower.
01 - Murray Lawn Mower Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
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02 - Murray Lawn Mower Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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03 - Murray Lawn Mower Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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04 - Old or Bad Gasoline
There may be old or bad fuel in the carburetor float bowl. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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05 - Murray Lawn Mower Start Switch
To determine if the start switch is defective, use a multimeter to test it for continuity.
Highly Likely
06 - Murray Lawn Mower Fuel Pump
The fuel pump has three ports: the gas in port, the gas out port, and the pulse port. The pulse port is connected to the engine crankcase by a small rubber tube. As the engine runs, air inside the crankcase alternately pressurizes and depressurizes the air in the tube. This pressurized air moves a diaphragm inside the pump and pumps the gas. If the engine oil is overfilled, oil can enter the pulse port line, preventing it from working properly. The fuel pump also has two small check valves on the input and output ports. The check valves prevent fuel from reentering the gas tank. These check valves can fail. To determine if...
Highly Likely
Frequently Asked Questions
Why won't my Murray lawn mower start?
My Murray lawn mower has spark but won't start. What should I check next?
How do I know if the start switch is bad on my Murray lawn mower?
Can old gas keep a Murray push mower from starting?
How do I find the right Murray lawn mower part for my model?
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