3 port / 4 port Fuel Petcock Valve.

maciejp · 09-06-2017, 09:10 AM

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?

rks · 09-06-2017, 06:13 PM

I would think the 4th port is used for a second cylinder/carburetor.

09-06-2017, 06:13 PM	#2
rks Join Date: Dec 2013 Location: Western New York Posts: 454	I would think the 4th port is used for a second cylinder/carburetor. __________________ 2011 Jonway 150cc..16,109 breakdown free miles, and counting
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