John Deere LT 150 mower will not start

Oddjob said:
If it won’t start up with starter fluid sprayed into the combustion chamber then you do not have a fuel delivery issue and replacing the carb is not likely to solve the problem. Maybe you need a new carb anyway, but you would get to the ultimate solution faster by pulling the kill wire off the coil and then trying to start the engine. If it starts, you would then know that the spark is grounding out and you could look for the switch or wire that is grounding the spark. (Always make sure you haven’t left the pto engaged as that grounds out the spark via the safety switch.) If it still doesn’t start with the kill wire off then you know it is either bad compression or bad ignition timing. Bad compression could be caused by out of tolerance valve lash or worn pistons. Timing is set via the flywheel and a woodruff key. Engines that have fuel, air, compression, and spark delivered on time will run. Simple as that. Eliminate possible suspects and move to the next, you’ll find the cause of your non start condition.
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I got it started but it would not throttle up and after while it died out. Trying to start it again it would backfire and the carburetor is flooding.
 
slomo said:
Fuel for just one of the four you need.

1.Air
2.Spark AT the correct time
3.Fuel
4.Enough compression to run.

Where exactly did you spray starting fluid at or into?small burst into carburetor.p
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slomo said:
Was this new pump tested? New doesn't mean new anymore. Do you have an old cracked pulse hose? Possibly not making a seal? Maybe NO pulse to the pump so she can't pump?
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I wasn’t the one that replaced the fuel pump so not sure if it was tested. Here’s an update. I replaced the carburetor. The mower started right up HOWEVER it will not throttle up.
 

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ZKaren said:
I wasn’t the one that replaced the fuel pump so not sure if it was tested. Here’s an update. I replaced the carburetor. The mower started right up HOWEVER it will not throttle up.
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Wrong type of spark tester. Recommend an open gap type that can stress the coil out. Weak coils can/might fire at low revs. At mid and high rpms, can/might fail on you not making spark.

Here is one for $1.29 shipped to your door.

 
ZKaren said:
Someone did put an aftermarket carburetor on it. But this carburetor doesn’t have the fuel solenoid there are no wires coming in to hook up.
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Might of bought the wrong carb for your engine??

If you have spark at the correct time, compression and air, and she still doesn't fire on carb spray fogged into the carb, look at your flywheel key.

Using last years gas and water? Untreated fuel from last year in the tank. Think you said new gas on page one.
 
slomo said:
Wrong type of spark tester. Recommend an open gap type that can stress the coil out. Weak coils can/might fire at low revs. At mid and high rpms, can/might fail on you not making spark.

Here is one for $1.29 shipped to your door.

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Thanks. I ordered it.
 
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