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MF 1450 runs great fro 10 - 15 minutes then dies


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#1 Kope OFFLINE  

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Posted July 13, 2016 - 07:36 PM

Hi everyone,

I'm looking for some advise as it has me stumped.

My M/F 1450 tractor starts and runs great for the first 10-15 minutes then without notice will just stall abruptly.

After that, it will start and run but needs to have the choke on to keep it running for the next few minutes.

 

Eventually it will completely stall.  If I let it sit for a few minutes it starts right up and runs fine for a short period (1 or 2 minutes).

 

The following has been done within the last month.

- Professionally rebuilt motor & carb. fuel pump.

- New fuel lines/pump/filter and vented gas cap.

- New ignition coil, plug and wire. 

- Gas lines appear to be free and clear of the motor and have been wrapped in heat protected sheathing.

 

Any ideas on what to check next?

 

Thanks in advance for everyone's help/advise.

 

Kope

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#2 dthomp17 OFFLINE  

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Posted July 13, 2016 - 07:43 PM

I had a similar problem with a cub cadet 1650 and the problem was a clogged fuel filter. Very similar symptoms to what you've described.


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#3 rustyoldjunk OFFLINE  

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Posted July 13, 2016 - 07:51 PM

Does sound like a clog or maybe vapor lock ?


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#4 Kope OFFLINE  

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Posted July 13, 2016 - 07:58 PM

Thanks guys,
New fuel filter and vented gas cap.
Even ran with the cap off and put the old gas cap on and did the same thing both times.

Fuel line has been insulated as well.
I'll check the filter one more time just to be sure.
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#5 secondtry ONLINE  

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Posted July 13, 2016 - 08:12 PM

   After it stalls for the second time will it still turn over normally? is the float bowl empty? is there fuel in the line to the carb? If choking helps it sounds like a fuel problem. Do you have a way to squirt a shot of gas into the carb throat safely. I have had engines act similarly and kept them running by hand choking them. Don


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#6 case1man OFFLINE  

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Posted July 13, 2016 - 08:44 PM

Had a problem like that once had some trash in the tank. After it sat awhile the suction of the fuel pump would release the trash.


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#7 Kope OFFLINE  

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Posted July 13, 2016 - 08:47 PM

It will turn over and start as normal after sitting for a minute or two.
I'll check the gas line for fuel next time I have it out.
I agree about fuel being the probable cause of the issue.
Just seems strange to have this happen after a fresh and complete rebuild.

#8 Sawdust OFFLINE  

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Posted July 13, 2016 - 08:56 PM

Any rebuild is a good thing but necessarily can leave you with a problem. Like mentioned it sounds like your fuel bowl is going empty. It could be hanging up. Like mentioned also try carefully shooting gas into the carb when it wants to die.

Edited by Sawdust, July 13, 2016 - 08:58 PM.


#9 New.Canadian.DB.Owner OFFLINE  

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Posted July 13, 2016 - 09:07 PM

http://gardentractor...vapour-locking/


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#10 EricFromPa OFFLINE  

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Posted July 13, 2016 - 09:14 PM

Sounds like she's vapor locking.After it stalls take the fuel cap off and look in the tank.If you see any bubbles coming up out of the pepcock then you'll know for sure.

 

Do you have the big heat shield installed on the muffler?It Needs to be installed if it isn't.

And add a piece of pipe to the end of the muffler and cut a 1 1/2" hole in your grill for the pipe to stick out like they did with the Snapper 1650.That way it doesn't blow soot all over the grill and blows the hot exhaust Out from under the hood instead of deflecting the exhaust and heat off of the grill and back at the engine. 

 

That will fix the vapor locking if that's what's going on.

 

massey.jpg   1650snapperpics001.jpg~original.jpg

 

My Snapper LT16 had a exhaust deflector plate on it and it was bent in.That thing vapor locked so hard that the clear lens on the gas cap blew apart.

 

I removed the deflector and all was good.Awesome running tractor it was.This is one with that stupid deflector still installed.

 

27634_huge.jpg

 

 

Beautiful looking MF 1450 you got there.I'm envious :rocker2: :worshippy1: :worshippy1: .


Edited by EricFromPa, July 13, 2016 - 09:28 PM.

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#11 boyscout862 ONLINE  

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Posted July 13, 2016 - 09:53 PM

I would disconnect the fuel line at the pump and let the fuel run out of it(into a clean container) for 5 minutes. If the flow tapers off, the problem is between the pump and the tank. You may have to jack up the back of the tractor for this to work. Other wise the problem is in the pump or carb. Try the Kohler Manual for its "Trouble Shooting Guide". Good Luck, Rick

 

BTW New defective is possible.


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#12 Marty'70 OFFLINE  

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Posted July 13, 2016 - 10:25 PM

I would disconnect the fuel line at the pump and let the fuel run out of it(into a clean container) for 5 minutes. If the flow tapers off, the problem is between the pump and the tank. You may have to jack up the back of the tractor for this to work. Other wise the problem is in the pump or carb. Try the Kohler Manual for its "Trouble Shooting Guide". Good Luck, Rick

BTW New defective is possible.

Had a farm tractor did what you're describing. Found a piece of junk that was on the bottom of the tank. Would float over to the pick up then stall out. After pressure evened out it would float away and start backup and run for a few more mine and all over again...

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#13 crittersf1 OFFLINE  

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Posted July 14, 2016 - 08:18 AM

Sounds like trash in the tank to me



#14 ducky ONLINE  

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Posted July 14, 2016 - 08:30 AM

Sure sound like a fuel supply issue.  Do as boyscout said and see if it will stay running if you squirt gas into the carb just to eliminate anything else.


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#15 Greasy6020 OFFLINE  

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Posted July 14, 2016 - 12:15 PM

Had a farm tractor did what you're describing. Found a piece of junk that was on the bottom of the tank. Would float over to the pick up then stall out. After pressure evened out it would float away and start backup and run for a few more mine and all over again...

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Had the same thing happen to me too, almost finished raking hay and the tractor died. Tractor sat all winter, runs perfect now, junk must have dissolved.

I'm also in the crap in fuel tank camp.




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