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I am rebuilding a 1977 GS750 that I purchased from a Sheriff's sale for $100. The fuel valve/petcock requires a vacume line. There was none when I got the bike. Where does the fuel valve get the vacume? The three lines coming from the carbs I believe to be breathers and not vacume. Am I wrong? There was no air box and I have gone to individuel filters. Could the vacume have come from the air box? I would appreciate any help I can get. Thanks in advance.
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There should be a total of EIGHT rubber lines on your carbs.
For the moment, we will ignore the four overflow tubes connected to the bottoms of the carbs.
There will be a fuel line that goes to a "T" in the middle.
There will be two vent lines that are connected to carbs 2 and 4. (they are numbered from left to right. #1 is under your clutch hand, #4 is under your throttle hand)
The one that looks like a vent line and is connected to #3 is your vacuum source for the petcock.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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Thaks for the info. I'm new here and appreciate the help. I look forward to being a part of this forum.Comment
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The fuel line on the petcock is 5/16" inside diameter. The vacuum line is 1/4" inside diameter. the 1/4" vacuum line on the petcock connects to the #3 carb as said. The connection nipple is on the left, forward side of #3 carb.
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