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Can I vent the Fuel line instead of the tank???

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    Can I vent the Fuel line instead of the tank???

    This may sound weird but the air locking of the fuel line has me boggled. I am thinking of running a T in the line after the petcock with a fuel line up to the bars above the tank and adding a loop to keep shit out of it to vent the line. In theory this should work to get the trapped air out all the time without spilling gas everywhere. Anyone see a reason it won't work. Like the float bowl level check using fuel lines. or the old skool tank side fuel gauges. Gas will only travel up until it hits the level in the tank but vent the damn line?? let me know if I'm nuts. if not I'm going to try it tonight.

    #2
    have you extracted the tall petcock screen for a good cleaning and flushed out the tank ?

    you shouldn't need an extra vent, find the problem, use compressed air to blow through the tank vent in the filler cap.
    Last edited by squirrelman; 08-10-2022, 04:38 PM.
    "It's only getting worse."


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      #3
      Originally Posted by squirrelman View Post
      have you extracted the tall petcock screen for a good cleaning and flushed out the tank ?

      you shouldn't need an extra vent, find the problem, use compressed air to blow through the tank vent in the filler cap.
      Tabk vent is clear. Air flows and no hiss or improvement when opening cap. Pump flows over fsm amount per minute. Petcock sprays gas when tested for flow. It absolutely rediculous that it air locks. You go 10 miles or 100 miles before it happens.

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        #4
        If you can't find the source of the air lock then maybe it isn't air lock at all.

        If you were looking for a support group you're barking up the wrong tree. This place is fulla enablers dude. - Shooter77us

        The bitterness of low quality lingers long after the thrill of a low price has gone. - RacerX450

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          #5
          Sounds like the problem I was having. I replaced some older fuel lines, pump and cleared out tank vent. When I say cleared out tank vent I really cleared it out. Actually blew the black plastic part right off the cap on accident. Put it back together and no more problems. When it would die on me I would pull over, open the cap (never hissed) and 5 min later it would start up and run 15 min or so and do it again.
          One other thing I did was remove the ground on the rear brake resevoir bracket and really cleaned it up and reinstalled.
          Good luck. Keep us posted.

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            #6
            I would say chase down the issue and don't T the line. The system works as designed. Im all for modding for performance or simplicity or even looks, but modification as to avoid fixing a problem just doesn't sit right with me.
            Don't spend money and buy, spend time and learn.

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              #7
              Originally Posted by 6 View Post
              I would say chase down the issue and don't T the line. The system works as designed. Im all for modding for performance or simplicity or even looks, but modification as to avoid fixing a problem just doesn't sit right with me.
              I agree but it's driving me nuts. You ride along fine for 10 miles to over 100 miles and the fuel filter is full of fuel and happy, then it acts up and you look down and it is empty and the bike acts like you need reserve only you don't. Pull over and no fuel flow. then you pull the fuel line and it explodes with gas all over your hands as you try to reconnect it. IF you close the petcock to prevent the spill it doesn't fix the issue, nor does opening the tank. I blew air with my mouth into the vent and it wasn't restricted at all easy to blow through it, hit it with compressed air too just to be sure. I'm changing the last fuel line that is still oem original with clear line to watch the flow better, just need to get to the store for some more as I don't have any left the right size.

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                #8
                Originally Posted by squirrelman View Post
                have you extracted the tall petcock screen for a good cleaning and flushed out the tank ?

                you shouldn't need an extra vent, find the problem, use compressed air to blow through the tank vent in the filler cap.
                No screen on the petcock, it wouldn't fit. Inline filter to catch crap. that being said I can shine a light into the tank and see the petcock is clear and it flows like mad when you test it without hooking up to the pump.

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                  #9
                  Originally Posted by ParcNHawk View Post
                  If you can't find the source of the air lock then maybe it isn't air lock at all.
                  Right, so what is it????LOL I call it air lock because the second you let air in, it flows like hell again.

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                    #10
                    Originally Posted by Maritime View Post

                    Right, so what is it????LOL I call it air lock because the second you let air in, it flows like hell again.
                    Have to tried riding with the gas cap loose ?
                    Maybe bad gas cap

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                      #11
                      Originally Posted by rcthirty View Post

                      Have to tried riding with the gas cap loose ?
                      Maybe bad gas cap
                      Yep, didn't help.

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                        #12
                        When I find the issue it's gonna be something small and stupid I am sure of it.

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                          #13
                          Originally Posted by Maritime View Post

                          No screen on the petcock, it wouldn't fit. Inline filter to catch crap. that being said I can shine a light into the tank and see the petcock is clear and it flows like mad when you test it without hooking up to the pump.
                          Is it the line to the pump that isn't getting fuel, or from the pump to the carbs?
                          Don't spend money and buy, spend time and learn.

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                            #14
                            That line could be pulling closed?
                            Isn't the stock line covered by a spring to prevent that?

                            Could that line be leaking at the pump inlet and drawing in air without causing an outward fuel leak?

                            If you were looking for a support group you're barking up the wrong tree. This place is fulla enablers dude. - Shooter77us

                            The bitterness of low quality lingers long after the thrill of a low price has gone. - RacerX450

                            Comment


                              #15
                              Originally Posted by 6 View Post

                              Is it the line to the pump that isn't getting fuel, or from the pump to the carbs?
                              Line to pump which is all new heavy NAPA line.

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