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Post by deejais on Jul 11, 2020 8:24:39 GMT -5
New GY6 engine out of the box. This split line is coming out of the area near the intake manifold. The old engine I threw away did not have this. I think its a vacuum line, but I have the fuel pump connected to one vacuum line already and it works fine. What would attach to it, and should I cap it?  |
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Post by FrankenMech on Jul 11, 2020 9:18:34 GMT -5
If you don't need them cap the vacuum lines.
If I remember right a 50cc only needs one vac line that either controls the petcock for gravity fed fuel systems or powers the vacuum fuel pump on a fuel tank below the carb.
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Post by GrumpyUnk on Jul 15, 2020 12:16:51 GMT -5
I thought the pumps were 'pulse' operated by the pressure developed in the crankcase as the piston oscillates. I know I have one that has a pump from the under-foot tank to the carburetor, but don't remember if it goes to the vacuum port on the intake or to a port on the crankcase... Duh.
The Y-pipe fitting shown is likely for PAIR and vapor recovery systems. If you don't have either or any emissions equipment that needs vacuum, plug that line, or place a cap on the fitting down at the intake elbow. Caps are available at auto parts stores, likely in the HELP section or possibly the windshield washer parts, etc.
tom
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Post by FrankenMech on Jul 15, 2020 14:27:43 GMT -5
The pump operates from a pulsed vacuum source, usually the intake manifold. I suppose a crankcase port could be used...
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Post by FrankenMech on Jul 15, 2020 18:56:50 GMT -5
It looks like your carb to intake manifold clamp may not be fitted properly.
How did a new engine get so dirty looking?
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Post by Mech Warrior on Jul 18, 2020 12:24:50 GMT -5
To my knowledge it appears that one line goes to the petcock and the other may go to the PAIR system.  |
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Post by deejais on Jul 30, 2020 11:32:36 GMT -5
To my knowledge it appears that one line goes to the petcock and the other may go to the PAIR system. Thanks for that photo. It's very helpful. |
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