Hi Normk and Jeff, I already consider possibility of pushing the fuel into the manifold chamber but the possibility is unlikely. Air is lighter than fuel and what will happen is the air will bubble up towards the opening of the primer instead of pushing the fuel through the jet into the manifold chamber. Victa primer bulb is not a check valve or a one way valve so the air the air will go straight through the primer bulb center hole. This only works as a check valve when you push it with your finger because because you block the hole. This is an easy way to dislodge the needle just in case it stick in. Jeff, to use the used Victa primer to push the air is way too small to produce air pressure. You need at least 5psi of air pressure to dislodge the needle. The needle is guaranteed to dislodge with the Tecumseh primer even inside the assembly. This will save you from dismantling the carburetor assembly.