- WHATSIZE FUEL TANK VENT NEEED MOTORCYCLE HOW TO
- WHATSIZE FUEL TANK VENT NEEED MOTORCYCLE MANUAL
- WHATSIZE FUEL TANK VENT NEEED MOTORCYCLE ZIP
This was a solution offered up by BMW when some owners complained that the tanks were prematurely running low on fuel and the pumps were whining because fuel was being dumped away from the fuel pump.Hey yeah, no problem! Well to start, I know it's not the petcock because I replaced it with the manual petcock from Eagle Mike a few months back.
WHATSIZE FUEL TANK VENT NEEED MOTORCYCLE ZIP
The extension could even dump toward the rear left-side of the tank by using hose of sufficient length then securing it to one of the vent pipes with a zip tie.
A submersible fuel hose could be clamped to it then routed downward. The basket-hose system channels air from the fuel stream before it can enter the pump.Ĭoncerning the fuel return streaming from the pipe-adapt to it. By its construction, the fuel sock prevents air from entering the pump and causing malfunction. The basket-vent hose-vent pipe scheme was obviated when the system was converted to a 43mm diameter pump using a fuel sock. If you believe your enjoyment of this moto is being hampered by an ancestral curse, connect it. Some owners have left the fuel basket unconnected to that short, barbed pipe without any ill effect on performance. Chances are the return pipe was plugged and cutting it was the solution. You have a neglected relic that has undergone 16th century diagnosis and treatment technique during its lifespan.
WHATSIZE FUEL TANK VENT NEEED MOTORCYCLE HOW TO
I've been doing that - what I need now is someone who knows how to replace that valve while I have the tank off and drained for maintenance. Does anyone have any experience with this? If so, I'll start another thread - the issue has come up several times in the past few years, and for me it's not a dribble anymore, but a stream - it only took a couple hours to drain 2.5 gallons of fuel through the outlet, whereas there should actually be no fuel coming out of there at all.īTW please refrain from discussing workarounds such as clamping off or plugging the hose. Unfortunately it's not shown in that cutaway, and if you look at the tank from below where the valve's nipple protrudes, it appears to be welded in there. I got the valve from Bike Bandit and it's supposed to be the replacement for the OEM part shown. While we're on the topic of tanks, I ordered one of these stop valves to prevent fuel from streaming out the hose when I pulled it off the tank, as discussed in this thread: There is no direct connection between the overflow drain pipe and that return supply hose.ĭoes the knobby connector have a function I do not understand? It's where the return fuel exits. This set-up puts the tube below fuel level, if my tank get pressurized because of heat, would this not just force fuel out of my drain and start a nice siphon effect? No. Why does this vent need to go to the nipple on the pump suction? To prevent cavitation at the pump inlet. If it is missing, returning fuel just pours out the spigot into the tank. This hose connection is to prevent cavitation and improve fuel flow. The hose to which MarcoK75c refers is normally connected between that spigot you see pointing upwards and the filter basket surrounding the fuel pump. The pipe you point out in the first post is one of these vent lines. You can also see the two vent lines, one of which is attached to that cylindrical collector, the other of which is attached to the gas cap mounting ring. You can see the fuel return line routing behind the collector unit and leading to a small spigot. The pipe you refer to is evident on the inverted top section of the cut-away tank and more clearly illustrated in the detail photo. The following annotated version of the above picture was kindly provided by Laitch later in this thread, around post 55: Carefully examine the pictures below of a cut-away K100 tank:
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