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#4497018 - 08/24/17 02:04 PM Mistakenly put diesel fuel into a gas lawn mower
handyman Offline


Registered: 02/15/05
Posts: 300
Loc: TX
My neighbor mistakenly put diesel fuel into a new Kubota riding lawn mower that would normally require gasoline. We drain the fuel tank and replaced the fuel filter. I shot starter fluid down the carb and it smoked the yard. It would not continue to run. The fuel filter did not look like it was getting any gas. He had to leave on a trip and we are going to work on it this weekend. Any suggestions on fixing this issue.
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#4497028 - 08/24/17 02:11 PM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
demarpaint Offline


Registered: 07/03/05
Posts: 29407
Loc: NY
Flush out the fuel tank, drop the carb bowl and empty it. Then disconnect the fuel line from the carb and flush the carb out with some carb cleaner. Put it together add some fresh gas, change or clean the spark plug and give it a try. You might need a bit of ether/starting fluid to get it running.
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#4497038 - 08/24/17 02:16 PM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
NHGUY Offline


Registered: 10/09/11
Posts: 4991
Loc: USA
Change the plug,its going to have a big ball of carbon on it.

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#4497051 - 08/24/17 02:29 PM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
mk378 Online   content


Registered: 09/27/15
Posts: 1338
Loc: USA
You'll have to clear the fuel line and the carb. Most of the time there is a nut on the bottom of the carb bowl, loosen it holding a container underneath and let it drain. Remove the spark plugs, you will need to clean them, and with the plugs out the engine will spin faster in the next step. Disconnect the fuel hose input to the carb and hold it on a container, turn the key and crank until clean gas (that you have poured into the tank) comes out. Then tighten the nut, reattach the line, crank to fill up the bowl, reinstall plugs, and start.


Edited by mk378 (08/24/17 02:30 PM)

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#4497113 - 08/24/17 03:46 PM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
mk378 described the way I would attack the issue.
Attach a label close to the filler "Gas only"


Edited by bioburner (08/24/17 03:48 PM)
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#4497348 - 08/24/17 09:21 PM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
CourierDriver Offline


Registered: 12/27/09
Posts: 4827
Loc: Tn.
My best answer,,,,don't do thattttttttttttttt anymore. thumbsup True story:Buddy of mine goes for a ride on his motorcycle,,stops, fills it up, not paying attention puts diesel in it,,,,why,,,I do not know,,,starts the engine and gets about 10 feet....after he gets it to the shop the next day, the bill was 150 to fix the mess..lol


Edited by CourierDriver (08/24/17 09:24 PM)
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#4497445 - 08/25/17 02:07 AM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: demarpaint]
Garak Offline


Registered: 12/05/09
Posts: 24074
Loc: Regina, Saskatchewan, Canada
Originally Posted By: demarpaint
Flush out the fuel tank, drop the carb bowl and empty it. Then disconnect the fuel line from the carb and flush the carb out with some carb cleaner. Put it together add some fresh gas, change or clean the spark plug and give it a try. You might need a bit of ether/starting fluid to get it running.

This. That's pretty much what I did some years ago when my younger brother put diesel in the gasoline rototiller. wink It smoked a bit, of course, too, until things were normal again.
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#4497616 - 08/25/17 09:25 AM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
ironman_gq Offline


Registered: 04/30/14
Posts: 604
Loc: MN
Shouldn't have done any real damage, just get it flushed out and change the spark plug. Might smoke a bit if it ran at all with the diesel until any in the muffler gets burned off.

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#4497641 - 08/25/17 10:12 AM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: ironman_gq]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4066
Loc: Storrs, Connecticut
Originally Posted By: ironman_gq
Shouldn't have done any real damage, just get it flushed out and change the spark plug. Might smoke a bit if it ran at all with the diesel until any in the muffler gets burned off.


This.

Diesel in a gas engine just makes a mess of the fuel system but won't cause any real damage. Gas in a diesel is where you get damage.
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#4501228 - 08/29/17 11:44 AM Re: Mistakenly put diesel fuel into a gas lawn mower [Re: handyman]
handyman Offline


Registered: 02/15/05
Posts: 300
Loc: TX
Well, I talked with his wife. He is going to have the Kubota dealer work on it. They say it is fuel injected and needs a special flush to clean it out. 250 bucks and they can get to it in a week or so.

I offered to work on it for him but I think he just wants the dealership to work on it.

Some people are just not mechanically inclined.
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