Fuel vent return etc Line Routing Diagram 2 stroke 300 1994 - Polaris ATV Forum
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post #1 of 9 (permalink) Old 12-13-2012, 01:09 PM Thread Starter
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Need diagram for routing lines in/out of carb (fuel drain oil vac) 2 stroke 300 1994

I've been searching for a diagram that shows routing of all lines in or out of carb for my 1994 300 2 stroke 4x4. On one of the lines there is a plastic fitting on line which i think may be some sort of a vaccume or one way valve, want to ensure its placed/oriented correctly.

I searched on here a lot, found a lot of people asking this (or similar questions), but haven't found a good diagram.

Can anyone help?

Last edited by laterongc; 12-20-2012 at 05:38 AM.
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post #2 of 9 (permalink) Old 12-16-2012, 12:49 AM Thread Starter
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bump for help
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post #3 of 9 (permalink) Old 12-19-2012, 09:39 PM Thread Starter
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anyone ?
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post #4 of 9 (permalink) Old 12-20-2012, 04:52 AM
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Not really sure what you're asking? So far as I know there is only one vent line out of the tank and you can run it anywhere you want that's out of the way. It's a "vent" into the atmosphere. There is no "return" line to anything on a carbed machine that I'm aware of.
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post #5 of 9 (permalink) Old 12-20-2012, 05:44 AM Thread Starter
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thanks for replying. perhaps wording of question wasn't the best (i attempted to reword/edit first post to make more clear). I'm simply trying to identify what all of the fittings are going into and out of the carb so I can see if mine is setup correctly and/or what i need to fix.

the prior owner wanted to premix and removed and blocked some of the lines, i'm trying to put back to stock.

also, there is a plastic fitting of some sort (maybe a vac / one way valve) on what may be a drain line (?) and i'm trying to figure out if that is setup correctly
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post #6 of 9 (permalink) Old 12-20-2012, 12:56 PM
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OK, I understand where you're coming from now. You probably need to find a repair manual for that machine to get the details on how the oiling system works and more importantly how to make sure it's adjusted correctly if your going to try to hook it all back up. Otherwise, you'd have to look at the "engine mounting", "oil tank" and "oil pump" microfiche pages individually to get an idea of how it all goes together. And don't forget the Throttle cable attachment to the oil pump.
If its been disconnected for a while, I'd be concerned about dirt and obstructions in the system and if there was some problem with components that caused the PO to unhook it to start with.
I think at this point, if it were mine, I'd just make sure everything was sealed up good where its unhooked. Clean the fuel tank out good and use good quality premix oil in it and ride it like you stole it. Unless you're prepared to spend some substantial money and time to go completely through the system I'd be worried about it not oiling sufficiently and ruining the engine or oiling too much and fouling plugs.
I'm sorry for going off on a tangent and not really answering your original question, but I just don't think it would be worth the time, money and risk to worry about it if its been disconnected for a while. If you mix your own you know that the ratio is correct and barring any other problems it will run good for a long time.
Good luck.
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post #7 of 9 (permalink) Old 01-08-2013, 05:46 AM Thread Starter
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Can anyone help with carb line routing???
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post #8 of 9 (permalink) Old 06-06-2013, 10:24 PM
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Ya that plastic deal is a one way valve. That comes off the bowl iirc then the other overflow goes into the 'T' just before that valve.

I will post a pic for you tmo

95 polaris xplorer 4x4 400 2 stroke
94 polaris 300 2x4 2 stroke
93 7.3 n/a f250
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post #9 of 9 (permalink) Old 06-07-2013, 09:08 AM Thread Starter
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that would be great. thanks.
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