Scepter Marine Primer Bulb 07813 | 1-1/4 in. Hose Barb

Scepter Marine Primer Bulb — 07813

The Scepter 07813 is a 1-1/4-inch marine fuel primer bulb designed for larger-diameter outboard and inboard/outboard fuel-line assemblies. Its dual internal check valves draw fuel toward the engine and prevent backflow when the line is at rest. Construction is gasoline- and solvent-resistant and rated for use with ethanol-blended fuels, including E10 marine fuel blends.

Specifications

• Part Number: 07813
• Hose Barb Size: 1-1/4 in. (fits 1-1/4 in. ID fuel hose)
• Internal Design: Dual check valves, high-flow priming
• Fuel Compatibility: Gasoline, ethanol-blended fuels (E10)
• Construction: Gasoline- and solvent-resistant materials

Compatible Applications

• Larger outboard portable and fixed-tank fuel systems using 1-1/4 in. ID fuel hose
• Inboard/outboard (I/O) fuel-line assemblies requiring a 1-1/4 in. primer bulb
• Custom marine fuel-line builds where a larger-diameter primer station is required
• Replacement of hard, cracked, or failed primer bulbs in existing 1-1/4 in. fuel circuits

Fitment — Verify Before Ordering

• Confirm your fuel hose inside diameter is 1-1/4 in. — this bulb is not interchangeable with smaller sizes such as the Scepter 07494 (5/16 in.)
• Scepter produces visually similar primer bulbs across multiple hose diameters — always measure the fuel hose ID, not the hose OD
• Confirm existing fittings and tank connectors are compatible with your engine and fuel tank
• Verify the primer bulb flow direction arrow points toward the engine after installation

When to Replace

• Bulb has become hard, cracked, or permanently collapsed and will not return to shape
• Bulb squeezes but will not firm up during priming
• Fuel drains back toward the tank between uses
• External fuel leakage is visible at the bulb body or hose connections
• Internal check valves no longer hold prime after repeated squeezing
• Hose-barb connections are damaged, cracked, or weeping fuel

Installation Notes

• Confirm hose ID is 1-1/4 in. before installation
• Install with the fuel-flow arrow pointing toward the engine
• Push the fuel hose fully onto each barb until seated against the bulb body
• Secure each hose end with an appropriately sized marine fuel-line clamp — see #20 Stainless Hose Clamp (1-1/4–1-3/4 in.) for a compatible option
• Route the bulb away from exhaust heat sources and abrasion points
• Prime the system fully and inspect all connections for leaks before starting the engine

Related Products

• Scepter Marine Primer Bulb 07494 — 5/16 in. Hose Barb
• #20 Stainless Steel Hose Clamp — 1-1/4–1-3/4 in.

Parts Desk Insights

Best Use Case: This is the right bulb when you’re replacing a failed primer on a larger-diameter fuel line — typically found on higher-horsepower outboards or inboard/outboard setups with larger-bore fuel delivery systems. If your current bulb goes soft, fails to hold prime, or shows cracks in the rubber, this is a straightforward direct replacement provided you’ve confirmed the 1-1/4 in. hose ID.

Common Issue: The most frequent ordering error with primer bulbs is selecting by appearance or engine size rather than measuring the fuel hose inside diameter. Scepter’s primer bulb range spans 1/4 in. through 1-1/4 in. and the bodies look nearly identical. A bulb that’s too small won’t seal on the barb; one that’s too large will be loose and leak. Measure the ID of the hose you’re replacing before ordering. If the existing bulb has no size markings, cut the hose end square and use a caliper or ruler across the inside opening.