Brandon4005
XS400 New Member
I recently got a 1978 xs400 (non running). The guy I bought it from got new carbs (MikesXs Dual Carb setup) that he put on but never ran fuel lines to. I’ve been messing around with running fuel lines but just can’t seem to get it to flow correctly. I currently have the OEM petcock which I believe is still operating properly as when I run lines from the petcock it was flow gas flow.
I first tried running keeping the one petcock nub and using a split to then run an individual line to each carb. The fuel did flow fine with this setup but I couldn’t get the fuel to flow evenly as it would just take the path of least resistance. (Tried a few variations of this with no success)
I ended up trying to do a little research and saw that there was a threaded block on the other side of the petcock that could maybe be used as a second nub to run a separate line altogether from. I ordered 2 90 degree nubs to run on each side. Again when I don’t have the lines connected to the carb itself fuel does flow, but when I connect them to the carbs I can’t get any fuel to flow. I know these petcocks are vacuum actuated, is that my problem here? And is there any work around?
Pictures attached for reference of where I currently am (4th pic is with the lines actually ran to the carbs). Any insight is much appreciated!
Couldn’t link pics for some reason but you can see pics for reference at Reddit Post:
I first tried running keeping the one petcock nub and using a split to then run an individual line to each carb. The fuel did flow fine with this setup but I couldn’t get the fuel to flow evenly as it would just take the path of least resistance. (Tried a few variations of this with no success)
I ended up trying to do a little research and saw that there was a threaded block on the other side of the petcock that could maybe be used as a second nub to run a separate line altogether from. I ordered 2 90 degree nubs to run on each side. Again when I don’t have the lines connected to the carb itself fuel does flow, but when I connect them to the carbs I can’t get any fuel to flow. I know these petcocks are vacuum actuated, is that my problem here? And is there any work around?
Pictures attached for reference of where I currently am (4th pic is with the lines actually ran to the carbs). Any insight is much appreciated!
Couldn’t link pics for some reason but you can see pics for reference at Reddit Post:
