Mower dies after running for 20-30 minutes

Bought a new fuel pump today. Installed it, cranked it without starting fluid finally. Thought I had it fixed. Ran like a champ for an hour. Stopped for supper. Went back out and cut for 45 more minutes without any issues. Then I’m a couple loops from done when I thought I heard it miss a little. Then again. I switch tanks and it stays running, other than a bit of stumbling as it switched over. But it then it really starts to stumble and I have to choke it to get back to the shop. Barely made it, but it didn’t quite die. Just hitting enough to stay running, but not enough to bring the deck on or go up a hill. If I took the choke off, i had to immediately pull it back on the keep it running. So it’s definitely fuel related, and changing the fuel pump made a big difference, but didn’t fully solve the problem.
 
not sure if this has been asked, did you go through the carb? maybe time for a rebuild or a new one?
 
I don't recall if it's been covered, or if another action you've taken can negate this, but have you checked inside your rubber fuel lines for a torn flap of rubber, or some sort of debris? Had a buddy chase a fuel delivery problem and it ended up being that one of the times that he crammed the rubber line back onto a hard line, the hard line cut a small flap of rubber that would act like a baffle and cut off fuel flow. pull the rubber line off and look in, and you wouldn't notice it. he just happened to inspect very closely and found it.

It's clearly a fuel delivery issue and it's erratic. It really sounds to me like there's some sort of debris, or something loose or something to that effect that is making it inconsistent.
 
mbalbritton said:
I don't recall if it's been covered, or if another action you've taken can negate this, but have you checked inside your rubber fuel lines for a torn flap of rubber, or some sort of debris? Had a buddy chase a fuel delivery problem and it ended up being that one of the times that he crammed the rubber line back onto a hard line, the hard line cut a small flap of rubber that would act like a baffle and cut off fuel flow. pull the rubber line off and look in, and you wouldn't notice it. he just happened to inspect very closely and found it.

It's clearly a fuel delivery issue and it's erratic. It really sounds to me like there's some sort of debris, or something loose or something to that effect that is making it inconsistent.
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Agree with this but if you go to the trouble of looking at them just replace.
 
Jeff B said:
not sure if this has been asked, did you go through the carb? maybe time for a rebuild or a new one?
Click to expand...
mbalbritton said:
I don't recall if it's been covered, or if another action you've taken can negate this, but have you checked inside your rubber fuel lines for a torn flap of rubber, or some sort of debris? Had a buddy chase a fuel delivery problem and it ended up being that one of the times that he crammed the rubber line back onto a hard line, the hard line cut a small flap of rubber that would act like a baffle and cut off fuel flow. pull the rubber line off and look in, and you wouldn't notice it. he just happened to inspect very closely and found it.

It's clearly a fuel delivery issue and it's erratic. It really sounds to me like there's some sort of debris, or something loose or something to that effect that is making it inconsistent.
Click to expand...
R Q said:
Agree with this but if you go to the trouble of looking at them just replace.
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Carb is 100% cleaned (and was clean as a whistle when I took it off), all fuel and vacuum lines are replaced also, with 300psi fuel injection style line. I replaced the pulse line with that line also, so that's the only other culprit, but I would think it would have caused an issue sooner than later instead of no issue after the first hour.
 
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