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Hot!Strange fuel problem with 33r877

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Steve p
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2020/08/26 20:21:36 (permalink)
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Strange fuel problem with 33r877

I have a JD d110 with a 33r877 that has been sitting for several years. Replaced the battery, cleaned the carb and put in fresh gas and now it will crank right up.

It runs for a few minutes the starts surging getting worse and worse until it dies. The fuel filter looked pretty bad so I replaced that and the fuel pump and no change.

Here is the part I can’t figure out- after replacing the pump I figured out that if I disconnect the pulse line from the pump it will run like a champ for a minute or so until it runs out of gas in the carb. It goes back to surging immediately when I reconnect the pulse line.

I can’t find any clogs or blockages in any of the lines so I have three thoughts
1- vacuum leak somewhere
2- something floating in the tank clogging the pickup while the engine is running then floating back to the bottom
3- something going on in the crankcase

Any ideas on this one? My next step as far as I can tell is pulling the tank which seems like a pain in the neck, or rigging up a gravity feed fuel tank on the hood and bypassing the pump.

Thanks for reading through all that and I would be grateful for any suggestions

4 Replies Related Threads

    AVB
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    Re: Strange fuel problem with 33r877 2020/08/27 11:54:31 (permalink)
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    IF you have already check the main jet for a loose fitting o-ring and replace the bowl gasket set provided it has the Nikki carburetor.
    post edited by AVB - 2020/08/27 11:57:17
    Steve p
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    Re: Strange fuel problem with 33r877 2020/08/27 13:52:44 (permalink)
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    Thanks I’ll check that when I get home from work. Would the loose oring be letting too much fuel through and causing the issue that way? I still can’t figure out why disconnecting the pulse line (basically shutting off the fuel pump) fixes the problem.
    AVB
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    Re: Strange fuel problem with 33r877 2020/08/28 07:09:05 (permalink)
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    Steve p
    Thanks I’ll check that when I get home from work. Would the loose oring be letting too much fuel through and causing the issue that way? I still can’t figure out why disconnecting the pulse line (basically shutting off the fuel pump) fixes the problem.

    Yes with the Nikki that JD indicates to you have the fuel transfer o-ring tends to leak. But with Nikki fuel bowl gasket even a new gasket can leak if there is defect in it. Two years ago I got in a batch of ten where every one of them was bad in the same place. It is one of the reasons I have a 10x loupe for inspecting them,\. I also use it to inspect the needle valve tip for ringing which causes problems.
    Mikel1
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    Re: Strange fuel problem with 33r877 2020/09/03 22:45:44 (permalink)
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    Also have a d110, you get it figured out? I do know that pulse line of fuel pump has very little push/pull while running
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