Even if you have the throttle body completely closed, the needles should still permit slight fuel flow.

You didn't say if you closed off fuel to the carb as I had asked...

But if you do not, you are pressurizing the line to the carb and FUEL WILL FLOW into the carb, albeit in small amounts.


Sorry CGRetired, but I beg to differ... you can try hooking up a piece of clean tubing and blowing into the carb nipple.

If the engine is properly tuned even at almost full throttle closure you get a bit of air flow, as NORMALLY the needle does not fully seal the aperture. There may be exceptions to this, but usually people fuel with the engine set to idle or there-abouts, so they can see fuel dripping from the carb if they do not clamp off the line or disconnect it.

Remember that they are effectively pumping fuel INTO the carb.