You can also install soft copper iwre "twist tie" hoze clamps to help ensure the hoses are sealed to the barbs. Or, Hobby shops that sell R/C car stuff will also have miniature spring wire hoze clamps at about $0.25 each.

On one remote needle, I had to make a copper twist tie hose clamp and tie the clamp to the needle body to keep the fuel line from sliding off... There was no barb on the connection.