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Garden Tractors Discussion Forum

Kobota G4200 fuel pump

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nathanialbumpo

01-31-2019 15:39:25




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I picked up a kobota G4200 with a diesel engine a couple of years ago. For two years it ran great, put it away for the winter and the following spring I went to start it up, it ran for 10 seconds and died. Turns out it was getting fuel. Checked all the lines fuel ran freely but pump wasn't running. Took the pump out and put 12 volts to it no reaction, so I order new pump. Install new pump turn key pump won't pump, tried jumping directly from the battery to the pump nothing happen. pulled new pump out, put 12 volts directly to pump doesn't do anything. It appears to be a diaphragm pump, does it need a electrical source the pulsate or did I just buy a bad pump.

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nathanialbumpo

02-06-2019 05:56:30




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 01-31-2019 15:39:25  
OK new pump is installed, I got fuel to the bleed valve on top of the fuel pump but nothing coming out tubes going to injectors. Right now I have the injectors tubes completely off and I am not seeing any fuel at top of pump. Is there another vent I should be opening to get fuel into pump. I turned the engine over a number of times but nothing comes out. There is some kind of a drain valve at the bottom of the pump but it is locked up pretty tight and I can't get it to budge.

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Ed will

02-04-2019 09:52:25




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 01-31-2019 15:39:25  
Hi, I just bought a Kubota 12V gas/diesel fuel pump from Ebay. It cost $15 and $5 shipping. Took 10 days. 2 wires and mtg bracket. Works perfectly.



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Mule Meat

02-03-2019 00:41:11




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 01-31-2019 15:39:25  
Those pumps only produce about 1 to 5 PSI of pressure.

Just about any universal small engine electric fuel pump will work on them.
If your pump came with the box attached to it. Did you open it up to check for a bad connection?



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kencombs

02-01-2019 11:17:21




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 01-31-2019 15:39:25  
Should have two wires, + an -. When both hooked to a battery it should pump.



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nathanialbumpo

02-01-2019 12:34:28




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 Re: Kobota G4200 fuel pump in reply to kencombs, 02-01-2019 11:17:21  
Looks like they sent me a bad pump.



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nathanialbumpo

02-07-2019 04:45:05




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 02-01-2019 12:34:28  
OK my pump is working, I have fuel to the injector pump, I have both lines off going too the fuel injectors.
No fuel is coming out of pump, BAD PUMP? Other than what I am doing is there any other way to test pump?



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kencombs

02-08-2019 16:38:21




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 Re: Kobota G4200 fuel pump in reply to nathanialbumpo, 02-07-2019 04:45:05  
Let's recap:

Your boost pump runs?
is there fuel at the input to the injector pump?
with the lines off the injector, does any fuel come out, When then engine cranks?
Have you bled the lines?



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nathanialbumpo

02-08-2019 16:56:44




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 Re: Kobota G4200 fuel pump in reply to kencombs, 02-08-2019 16:38:21  
Well I did all that, checked all that, then went to YouTube and watched a guy repair the injector pump. After seeing how it was suppose to work I figured it had to be the problem. Both plungers were stuck, cleaned and lubed everything and 40 minutes later It was purring. The original fuel pump was bad, the replacement I bought was bad, the last one cost me $20 and works nicely.



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