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Old 09-06-2017, 10:10 AM   #1
maciejp   maciejp is offline
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3 port / 4 port Fuel Petcock Valve.

What is the difference between the 3 port valve fuel pump (one is IN and is OUT and one is vacuum). The 4 port is tagged as Vent. When I hooked up the petcock, It sprayed out gas. So does it go into the gas tank vent hose? What is the normal purpose for this 4th port?

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Old 09-06-2017, 07:13 PM   #2
rks   rks is offline
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Location: Western New York
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I would think the 4th port is used for a second cylinder/carburetor.
2011 Jonway 150cc..13,453 breakdown free miles, and counting

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fuel pump petcock

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