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Discussion Starter #1
We inherited a Jacobson’s green 4 mower,
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with a Kubota d722 engine, we are a bit stuck with the fuel delivery system. We would appreciate any help below are some photographs and an explanation of the current fuel set up. The diesel tank has two fuel pipes coming out of the bottom of it, one on opposite side of the tank, one is the traditional system where the pipe goes to the fuel filter and then onto the fuel pump. The other pipe goes to the end of the spill rail and exits the end of the spill rail and enters into the fuel pump, is this a normal set up? Normally one end of the spill rail is blanked and the overflow pipe goes from the non-blanked end back in to the top of the fuel tank. any help would be greatly appreciated, you can just about see on the photo the fuel pipe entering the spill rail it has a sliver clip. Bottom photo spill pipe entering back into the fuel pump.
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That's a normal setup on Kubota engines.

You'll have the injection pump return and the injectors return that it's the rail on the side of the injectors. All of these returns just tied together and should go back to the tank.
 

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Welcome to MTF Cannyjimblue. ?

What is the actual problem you are having, in any?
 

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Discussion Starter #4
Cheers, problem it won’t start, one of the injectors is leaking and we are going to remove it, we are having problems removing the spill rail it appears to be stuck on, we have removed the retaining nuts but it doesn’t want to come off...tap it will a hammer, soak it with wd40!! Back to the delivery system, when you remove the spill pipe at the end of the spill rail, the black one entering the fuel pump, diesel is coming out under a low pressure,... the way you can stop it is by clamping the line otherwise it would eventually empty the diesel tank. Are you suggesting that once the engine starts the diesel will be forced from fuel pump along the small black pipe across the spill rail and back up the other fuel pipe and into the tank, but why is this pipe entering the bottom of the tank and not the top?
 
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