BX1800 Issues

   #1  

PearlWhiteGT

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New Holland T1510
My dad owns an older Kubota BX1800 with a Diesel engine and has been having some issues with it. It starts and runs fine but after about 30 - 45 mins of mowing it starts to sputter and then dies like it's out of fuel (which it's not). If he lets it sit for a good while it will crank back up and run for a while till it shuts down again. He's replaced the fuel pump, fuel filter, flushed the tank and lines and still no help. Seems to only happen after running for a good while. Any idea what is going on?
 
   #2  

thepumpguysc

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It’s possible that the “gas” cap is plugged.. it has to b vented..
next time it happens and before it shuts off, reach up and loosen the cap.. if it sucks in or runs right, u found the problem.
 
  
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#3  
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PearlWhiteGT

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At this moment anything is possible. Will definitely give that a try though. Anything else to check for if that isn’t the problem?
 
   #4  

Roadworthy

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I think the pump guy gave you the solution. Wait to see if the problem recurs and go from there.
 
   #5  

dodge man

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Two other possibilities. First is there is a small electric fuel lift pump. It almost looks like a metal fuel filter, it’s near the back of them tractor. Is this running? You should here it running if you turn the key but don’t start the tractor, kind of a clicking noise. The main injection pump will pull fuel on its own but it really needs the lift pump to run correctly.

Second, there are two fuel filters, one near the back underneath, another near the main injection pump. Did both get changed?
 
   #6  

JWR

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There have been numerous threads like this on the same kind of sysmptoms. Do a search on TBN and read some of them. They included a leaf in the tank that kept covering the fuel outlet at times, a bottle cap doing that same thing, a gob of sludge in the lines not getting flushed, I think a few heating issues, etc. Certainly as the guys say above it may be a fuel cap whose vent is not open & as fuel is used it creates a vacuum in the tank and eventually wins over the fuel pump. Unscruw the cap and run with it loose and it will never hapen if that is the problem. Or as they say unscrew it when the problem begins to show.
Who knows many possibilities. Process of elimination.
 
  
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#7  
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PearlWhiteGT

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New Holland T1510
Two other possibilities. First is there is a small electric fuel lift pump. It almost looks like a metal fuel filter, it’s near the back of them tractor. Is this running? You should here it running if you turn the key but don’t start the tractor, kind of a clicking noise. The main injection pump will pull fuel on its own but it really needs the lift pump to run correctly.

Second, there are two fuel filters, one near the back underneath, another near the main injection pump. Did both get changed?

Thanks, and yes both filters did get changed. Will definitely check the small electric fuel lift pump but if any of these were the issue why would it run for a good 45 mins under load then start to have issues?
 
   #8  

Grandad4

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It sure sounds like a fuel delivery issue, but thinking out of the box, those darn "safety" interlocks are another common source of engine cut-off problems. Just another possibility.
 
   #9  

dodge man

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It would run because the main injection pump has enough suction to pull fuel from the tank, then maybe you head up a hill or something and it won’t pull enough fuel. Not saying that is it but it’s an easy check, just turn the key on without a start and listen. It’s also been known to happen that the small lift pump is fine but the wiring gets pulled off.
 
   #10  

Henro

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If all else fails, you can hook up a temporary gravity feed of fuel, from a gallon jug your hang somewhere, like on your ROPS, and hook into the system using tubing, so that it feeds the injector pump directly, or maybe feeds fuel through the last filter before the pump.

If the tractor operates normally when your gravity feeling from your temporary hook up, then you know it’s a fuel supply problem. If it doesn’t, then chances are real good it’s a problem somewhere after the point where you hook your temporary fuel feed into the normal system.
 
 
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