Tighten with wrench. Kerosene in pump barrel Pump valve is defective. Replace pump valve. Pump will not function Leather washer too dry. Scrape washer and lubricate with oil.
Pressure comes from container Pressure valve is defective.
Screw on gauge open. Vaporizer valve defective. Replace Pump valve. Light is dim Not to full Pressure is too low. Nipple is blocked.