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M-ZT 52 Stops running when hot!

#1

L

littlegman

I have a Husqvarna M-ZT52 with the Kawasaki FS651V motor. I have had it about 5 years and has served me well, about a month ago while mowing my 2 acre lot, it would quit running about 1/2 way threw and would not start until it sat there about an hour. It looked like the fuel filter was empty so I figured the fuel pump was going. so I installed new fuel pump and filter but is still doing the same thing. I know its hot here in Tennessee but no different than other year but never had this problem before, any suggestions ?


#2

S

slomo

Pull fuel line off AT carb inlet. See what you get when cranking the engine.

Even better, crank/pump into a glass jar and look for water.

Most likely fuel tank is plugged with grass, bugs, dirt dobbers and leaves. Tank output knecks down and trash plugs this up. Dead tank cap gasket adding to the mix.


#3

L

littlegman

slomo said:
Pull fuel line off AT carb inlet. See what you get when cranking the engine.

Even better, crank/pump into a glass jar and look for water.

Most likely fuel tank is plugged with grass, bugs, dirt dobbers and leaves. Tank output knecks down and trash plugs this up. Dead tank cap gasket adding to the mix.
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Thanks for the suggestions, I will definately check them out.


#4

R

Rivets

Get yourself an inline spark tester and the next time it happens install the tester and check for spark. I suspect you will find no spark. You have either a hot short ot hot open, which means the coil will need to be replaced.


#5

S

slomo

Taryl made a video explaining the coil tester types. He said and I agree, the light bulb type does not give the full picture of coil performance. Taryl said to get the Briggs type or even better the PET-4000. He had a coil that would fire at low revs then crap out at mid and high revs. I've seen the same thing several times. Reason why I bought a PET-4000.
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#6

R

Rivets

I see I no need for the average DIY guy to purchase one of the expensive testers, which he will use as once or twice. I’ve used the simple neon tester for ever and have not had any problems. Do have one in my box, but I would be lying if i told you the last time I used it.


#7

A

Auto Doc's

For both coils to fail at the same time is highly unlikely. Usually, a reduction in power is quickly noticed, but not a total shutdown.

I would study the fuel system closer. Trash in the tank getting sucked into the pickup tube is fairly common. Bugs, dirt and grass clippings get into fuel cans easier than people realize.

A common issue I run across at about this age is the fuel pump pulse line getting cracks in it. When that happens the fuel pump quits working because the line gets hot and swells just enough so the crankcase pulses will not operate the fuel pump.

A spark tester is nice but use only the ones you can adjust the air gap on by hand. Ebay has them for just a few bucks each. Do not get the one with the bulb in them, they are unreliable.

The other item to check is the main power fuse to make sure it is not getting hot or fitting in the fuse holder loose.

The next item to check is under the upper engine cover. Mice love to nest up inside them and grass clipping along with dirt collect and choke down the cooling air fins.

Hope this helps you.


#8

A

Auto Doc's

For both coils to fail at the same time is highly unlikely. Usually, a reduction in power is quickly noticed, but not a total shutdown.

I would study the fuel system closer. Trash in the tank getting sucked into the pickup tube is fairly common. Bugs, dirt and grass clippings get into fuel cans easier than people realize.

A common issue I run across at about this age is the fuel pump pulse line getting cracks in it. When that happens the fuel pump quits working because the line gets hot and swells just enough so the crankcase pulses will not operate the fuel pump.

A spark tester is nice but use only the ones you can adjust the air gap on by hand. Ebay has them for just a few bucks each. Do not get the one with the bulb in them, they are unreliable.

The other item to check is the main power fuse to make sure it is not getting hot or fitting in the fuse holder loose.

The next item to check is under the upper engine cover. Mice love to nest up inside them and grass clipping along with dirt collect and choke down the cooling air fins.

Hope this helps you.


#9

S

slomo

This is Taryl's video where he talks about coil testers. I've seen this on about five or six coils. This is why I preach about the wide gap types as the superior tool.

Fast forward to 4:08 and ends at 7:03.



#10

Tiger Small Engine

Tiger Small Engine

Auto Doc's said:
For both coils to fail at the same time is highly unlikely. Usually, a reduction in power is quickly noticed, but not a total shutdown.

I would study the fuel system closer. Trash in the tank getting sucked into the pickup tube is fairly common. Bugs, dirt and grass clippings get into fuel cans easier than people realize.

A common issue I run across at about this age is the fuel pump pulse line getting cracks in it. When that happens the fuel pump quits working because the line gets hot and swells just enough so the crankcase pulses will not operate the fuel pump.

A spark tester is nice but use only the ones you can adjust the air gap on by hand. Ebay has them for just a few bucks each. Do not get the one with the bulb in them, they are unreliable.

The other item to check is the main power fuse to make sure it is not getting hot or fitting in the fuse holder loose.

The next item to check is under the upper engine cover. Mice love to nest up inside them and grass clipping along with dirt collect and choke down the cooling air fins.

Hope this helps you.
Click to expand...
Does the engine die suddenly like you turned the key off (electrical), or kind of chug a bit and come to a halt (fuel)?


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