2014 Kubota BX1870 Tractor - Engine bogging down and stalling.

Shane Hanna · 2025-12-01T00:22:11-0500

2014 Kubota, I cleaned fuel tank, changed fuel filter, changed air filter, replaced fuel pump, added new diesel fuel (just a little to test), I am baffled at why this is happening, but I am positive someone else will know. I appreciate any suggestions, thanks in advance. It does it at idle, full throttle, seems to be worse under load, but it also seems very random. Here is a video of how it is acting:
New video Â· Sunday, Nov 30 ð¬

RjCorazza · 2025-12-01T05:46:01-0500

I believe the BX tractors have (2) fuel filters inline. Did you replace both of them? It sure sounds like a fuel delivery issue.

Tx Jim · 2025-12-01T06:06:04-0500

Many yrs ago I owned a M4900 that the engine bogged down even after changing fuel filter, cleaning water separator screen. Local Kubota dealer service manager advised me to check for clogged screen in fuel control valve in water separator housing. I removed retaining screw then removed control valve & located the tiny screen & it was clogged. Cleaned screen & bogging problem was solved.

Shawn T. W. · 2025-12-01T06:09:52-0500

Also check and see if there is a hose kinked ...

thepumpguysc · 2025-12-01T09:43:54-0500

Fuel supply issue..
Does your machine have a supply pump.??
I think I remember seeing something about a 2nd filter under the tractor..??

Shane Hanna · 2025-12-01T12:46:16-0500

RjCorazza said:
I believe the BX tractors have (2) fuel filters inline. Did you replace both of them? It sure sounds like a fuel delivery issue.

Yes, I actually upgraded to a fuel filter water separator combo like 4 years ago, so I think I am good there. Thanks.

dodge man · 2025-12-01T15:45:20-0500

Are you 100% sure you still don’t have one of those little filters somewhere? There is originally one under the tractor towards the back and one up near the injection pump. When I had a BX I also upgraded and put a Racor unit in but still had the little white one underneath.