CT Jay
Bronze Member
This at first seems pretty basic problem & solution......but....
BX25 - 130 hours. Couple of weeks ago (approx 10 hours time) engine suddenly started running rough, hesitating, and nearly stalling out, particularly going uphill......and after babying throttle for a short while, engine would run smoothly again, but only for a while until same problem....over and over.
Thought I was running low on fuel. Took only about 3 gal's. Problem not solved.
Thought it was air in fuel line. Followed procedure in manual to bleed air from fuel line (key to on position for 30 sec's listening to pump clicking away, to pump fuel and push out air, before then cranking starter). Problem not solved.
Thought it might be bad fuel, perhaps water in fuel. Manual said to purge water periodically, referring to some kind of bleed valve somewhere unspecified, but couldn't find it. Checked my parts manual. Couldn't find fuel drain-purge valve. Checked my shop service manual. No reference to this mysterious phantom purge valve.
Now puzzled and worried, because I had my 50 hour service (at 75 hours) and I know they changed the fuel filter because I watched the job.
Went back to the manuals, and learned that there's TWO fuel filters on BX25, and perhaps all BX series too! Filter I didn't know about is under the tractor frame, just in front of hydro transmission. Fuel pathway as follows - - Tank - filter #1 - pump - filter #2 (under hood next to engine block) - etc.
I realized then that in my 50 (75) hour service, they didn't do the 1st filter that's under the tractor! Looked underneath frame, saw it was filled with unhealthy looking brown fuel that didn't seem right. Bit of a tussle to get the old filter off (hemostats to clamp fuel lines on both sides so I wouldn't take a diesel shower lying on my back right under the filter) and awkward location for releasing hose clamps and bracket that holds filter in place .... but after an annoying 20 min's on my back under the machine, plus crawling out a few times to get tools I didn't think I'd need for the job, got new filter finally in place, and everything reconnected.
Did the 30 second air purge again....then cranked the starter.....first a cough or two, then strong startup. Problem solved. Have put approx 10 hours on machine since the new filter went in, and now running solid and not a bit of hesitation or roughness.
Moral of story - - be sure to change the first filter under the frame! It's the first place in the fuel pathway where gunk will clog the flow and fuel-starve the machine! Won't help a bit if you only change filter #2 if #1 is clogged!
BX25 - 130 hours. Couple of weeks ago (approx 10 hours time) engine suddenly started running rough, hesitating, and nearly stalling out, particularly going uphill......and after babying throttle for a short while, engine would run smoothly again, but only for a while until same problem....over and over.
Thought I was running low on fuel. Took only about 3 gal's. Problem not solved.
Thought it was air in fuel line. Followed procedure in manual to bleed air from fuel line (key to on position for 30 sec's listening to pump clicking away, to pump fuel and push out air, before then cranking starter). Problem not solved.
Thought it might be bad fuel, perhaps water in fuel. Manual said to purge water periodically, referring to some kind of bleed valve somewhere unspecified, but couldn't find it. Checked my parts manual. Couldn't find fuel drain-purge valve. Checked my shop service manual. No reference to this mysterious phantom purge valve.
Now puzzled and worried, because I had my 50 hour service (at 75 hours) and I know they changed the fuel filter because I watched the job.
Went back to the manuals, and learned that there's TWO fuel filters on BX25, and perhaps all BX series too! Filter I didn't know about is under the tractor frame, just in front of hydro transmission. Fuel pathway as follows - - Tank - filter #1 - pump - filter #2 (under hood next to engine block) - etc.
I realized then that in my 50 (75) hour service, they didn't do the 1st filter that's under the tractor! Looked underneath frame, saw it was filled with unhealthy looking brown fuel that didn't seem right. Bit of a tussle to get the old filter off (hemostats to clamp fuel lines on both sides so I wouldn't take a diesel shower lying on my back right under the filter) and awkward location for releasing hose clamps and bracket that holds filter in place .... but after an annoying 20 min's on my back under the machine, plus crawling out a few times to get tools I didn't think I'd need for the job, got new filter finally in place, and everything reconnected.
Did the 30 second air purge again....then cranked the starter.....first a cough or two, then strong startup. Problem solved. Have put approx 10 hours on machine since the new filter went in, and now running solid and not a bit of hesitation or roughness.
Moral of story - - be sure to change the first filter under the frame! It's the first place in the fuel pathway where gunk will clog the flow and fuel-starve the machine! Won't help a bit if you only change filter #2 if #1 is clogged!
