Why Is Your Outboard Primer Bulb Not Working? Symptoms & Fixes
Why Is Your Outboard Primer Bulb Not Working? Symptoms & Fixes A fully functioning marine fuel system relies on a simple component to get started: the outboard primer bulb. This hand-operated inline pump draws fuel from the vessel's tank and forces it into the engine's vapor separator tank or carburetor, priming the line before ignition. When the primer bulb stays soft, collapses, or fails to draw gas, the engine struggles to crank or stalls shortly after starting. Diagnosing these issues early protects your outboard motor fuel pump from running dry and incurring mechanical damage. Common Symptoms of a Bad Primer Bulb Identifying primer bulb failure early prevents frustrating crank failures at the dock. Common warning signs include: ● The Bulb Stays Soft or Squishy: Squeezing the bulb repeatedly produces no resistance, indicating fuel is not building pressure within the line. ● The Bulb Sucks Flat or Collapses: The bulb flattens during operation or priming and stays s...