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06kfx440

99 Polaris Xplorer 400. Vapor lock?

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So I’ve rebuilt this quad and the only issue is fuel delivery. The filter fills up then runs out of fuel then dies. I’m thinking that vapor lock is the cause. And here’s my reasoning. The fuel lines are supposed to be 3/8 are 5/16 on there and it looks to have a huge filter on there. I did blow out all the lines and checked the petcock as well as the screens in the tank. Sonic cleaned the carb and replaced all the jets and needle. Blew out the vent lines too. Any one else have thought?

 

 

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It’s possible about the fuel line thickness but I don’t think it’s likely.  I would remove the fuel filter and run a direct line to the carb without the filter. Just to see how it runs.   The filter is directional so it should go on the line on the right direction, have you checked that also ?

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Yes. When I was shooting air thru it it’s clear all the way to the carb. The carb is clear also. I took the cap off the tank just to rule that out too


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I would pull the gas line off and replace with a direct line from tank to the carb w out the filter.  See what it does.   

It’s good to see you back on the forum brother ! @06kfx440 hope your feeling well.  

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It’s the same thing that happens with the filter. Runs great then dies. Ill show you guys what I’m talking about in a few minutes.

It’s awesome to be back. The quads took up some time. I have something else I’m working on too that will be custom and awesome.


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It’s the same thing that happens with the filter. Runs great then dies. Ill show you guys what I’m talking about in a few minutes.

It’s awesome to be back. The quads took up some time. I have something else I’m working on too that will be custom and awesome.

I’ve been doing okay. Got a lot things under control. I’m coming out to L.I.C next week. Have a few things to do down there. Let’s meet up and have a beer.


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I love finding new things that break. Lol. The magnets on the flywheel came off. But it’s a simple fix. Gorilla glue and clamps


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Yeah. Smaller lines and filter fixed it. But now it’s a ping at low idle and goes away when you rev it. It’s all new besides the dome. I don’t suspect piston slap. Give me a text frank. New phone.


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