3/8 in Hand Fuel Primer Bulb for Carbureted Marine Outboard Fuel Systems
3/8 in Hand Fuel Primer Bulb for Carbureted Marine Outboard Fuel Systems is backordered and will ship as soon as it is back in stock.
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3/8 in Hand Fuel Primer Bulb for Carbureted Marine Outboard Fuel Sy...
3/8 in Hand Fuel Primer Bulb for Carbureted Marine Outboard Fuel Systems is backordered and will ship as soon as it is back in stock.
Product Details
This hand-operated fuel primer bulb is designed for use with compatible marine and boat fuel systems that use a 3/8 in fuel hose. It is intended for low-pressure, carbureted outboard fuel systems and installs in-line between the fuel tank and engine.
Before ordering, compare the hose size, connection style, fuel-flow direction, and original primer bulb with the product shown. This replacement is not intended for high-pressure EFI or DFI fuel systems.
- In-line installation with a compatible 3/8 in fuel hose.
- Hand-operated bulb for priming the fuel line before starting.
- Integrated one-way check-valve design to help maintain fuel flow in the correct direction.
- Suitable only where the original application uses a matching hose size and compatible fuel-system configuration.
Cross-Reference Information
The original listing references the following numbers for comparison. Always verify the original part, hose diameter, fittings, and application before purchase; a number appearance alone does not confirm fitment for every engine.
| Brand or source | Reference number or description |
|---|---|
| Mercury / Mariner | 9001080A |
| Johnson / Evinrude | 50073805, 73805 |
| Application description | 3/8 in marine primer bulb or hand fuel pump |
Engine and Application Compatibility
This bulb is intended for compatible carbureted marine outboard applications using a 3/8 in fuel line. Compatibility depends on the complete fuel-system configuration, including the hose diameter, hose-barb size, clamps, fuel type, and operating pressure.
| Application | Required condition | Important limitation |
|---|---|---|
| Marine outboard fuel systems | Compatible 3/8 in fuel hose and in-line primer-bulb layout | Confirm the original bulb and fittings before installation |
| Carbureted outboards | Low-pressure fuel system requiring manual priming | Not a confirmed fit for every model, year, horsepower, or serial range |
| EFI or DFI systems | Not established for this product | Do not use in a high-pressure fuel-injection system unless the engine manufacturer specifically approves it |
Technical Specifications
- Product type
- Hand fuel primer bulb
- Installation
- In-line with the fuel hose
- Intended application
- Low-pressure, carbureted marine fuel systems
- Hose connection
- For compatible 3/8 in fuel hose; verify actual hose-barb fit before installation
- Flow control
- Integrated one-way check-valve design
- Fuel-flow direction
- Install according to the flow arrow molded on the bulb
- Fuel system limitation
- Not specified for high-pressure EFI or DFI systems
What's in the Box
- 1 × Hand fuel primer bulb
Fuel hoses, clamps, connectors, and other installation hardware are not included unless separately stated in the order.
Installation Notes
- Turn the engine off, allow it to cool, and work in a well-ventilated area away from ignition sources.
- Relieve any applicable fuel-system pressure and place an absorbent pad or suitable container beneath the fuel line.
- Before removal, note the direction of fuel flow and the orientation of the original bulb.
- Loosen the hose clamps and carefully remove the fuel hoses from the old bulb.
- Confirm that the replacement bulb and hose-barb size match the existing fuel line.
- Install the bulb with its flow arrow pointing from the fuel tank toward the engine.
- Push the fuel hoses fully onto the barbs and reposition the clamps securely behind the barbed sections.
- Squeeze the bulb several times to prime the line, following the engine manufacturer's starting procedure.
- Inspect every connection for fuel leakage before starting the engine.
- After starting, stop immediately if fuel leakage, unusual bulb behavior, or a strong fuel odor is present.
Troubleshooting and FAQ
How do I know whether this primer bulb fits my engine?
Confirm that your existing system uses a 3/8 in fuel hose, an in-line hand primer bulb, and a low-pressure carbureted fuel system. Compare the original bulb, hose barbs, clamps, flow direction, and available installation space. Do not rely on the engine brand alone to determine fitment.
Which way should the bulb be installed?
Install the bulb with the molded flow arrow pointing from the fuel tank toward the engine. An incorrectly oriented bulb may not prime the fuel line correctly.
Why does the bulb not become firm?
Check the flow direction, hose connections, clamps, fuel-line condition, tank pickup, and fuel-tank vent. An air leak, restricted pickup, damaged hose, or worn check valve can prevent the bulb from remaining firm.
What are common signs of a worn primer bulb?
Inspect for cracking, hardening, swelling, fuel leakage, surface damage, or a bulb that will not hold prime. Replace the bulb if any of these conditions are present.
Can this be used on an EFI or DFI engine?
This listing is intended for low-pressure, carbureted applications. High-pressure EFI and DFI systems have different fuel-system requirements; do not use this bulb unless the engine manufacturer specifically approves the application.
Does the package include hoses or clamps?
No. The package contains one primer bulb only. Reuse existing hoses and clamps only when they are in good condition and compatible with the replacement.
Is this an OEM part?
This is an aftermarket replacement primer bulb. The reference numbers shown are provided for comparison and are not a claim that this product is manufactured by the named engine brands.
Safety and Important Information
- Fuel is flammable. Work outdoors or in a well-ventilated area and keep the product away from sparks, flames, and hot surfaces.
- Inspect all connections for leaks before operating the engine.
- Verify hose size, fittings, flow direction, and application requirements before purchase.
- Do not use this product in a high-pressure fuel-injection system unless specifically approved by the engine manufacturer.
- Professional installation is recommended when the fuel-system configuration or compatibility is uncertain.
About Sea Sierra
- Marine replacement parts — Practical replacement components for compatible marine maintenance applications.
- Application-focused information — Compare the original part, hose size, fittings, and installation requirements before ordering.
- Replacement support — Use the product details and safety information to help select the correct part for your fuel system.
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