1. Introduction
This manual provides instructions for the Briggs & Stratton Carburetor Primer Bulb, part number 694394. This genuine replacement part is designed for small gasoline engines equipped with a pulse prime carburetor, commonly found in Sprint, Classic, and Quattro engine models. The primer bulb facilitates engine starting by delivering a small amount of fuel to the carburetor.
Image 1.1: Briggs & Stratton Carburetor Primer Bulb 694394. This image shows the red primer bulb and its white retaining ring, ready for installation.
2. Compatibility
The Briggs & Stratton Carburetor Primer Bulb 694394 is specifically designed for engines that utilize a pulse prime carburetor. To ensure correct fitment, it is crucial to verify compatibility with your specific engine model before purchase and installation.
- Part Number Verification: Confirm that your engine requires Briggs & Stratton part number 694394.
- Engine Type: Suitable for small gasoline engines with a pulse prime carburetor, including many Sprint, Classic, and Quattro series engines.
- Consult Documentation: Refer to your engine's Operator's Manual or the Illustrated Parts List available on the official Briggs & Stratton website for precise compatibility details.
Image 2.1: Packaging for Briggs & Stratton Primer Carburetor 694394. The packaging clearly displays the part number and "Genuine Part" designation.
3. Installation
Replacing the primer bulb is a straightforward process. Always ensure the engine is cool and disconnected from any power source (e.g., spark plug wire removed) before beginning any maintenance.
- Prepare the Engine: Ensure the engine is turned off and cool. Disconnect the spark plug wire to prevent accidental starting.
- Locate the Old Primer Bulb: Identify the existing primer bulb on the carburetor.
- Remove the Old Bulb: Carefully pry out the old primer bulb. It is often held in place by a retaining ring or simply pressed into a housing. Use a small flat-head screwdriver if necessary, being careful not to damage the carburetor housing.
- Clean the Area: Wipe away any dirt or debris from the carburetor housing where the primer bulb sits.
- Install the New Bulb: Position the new Briggs & Stratton Primer Bulb 694394 into the opening. Press firmly and evenly around the edges until it is securely seated. Ensure the retaining ring (if applicable) is properly engaged.
- Reconnect Spark Plug: Reconnect the spark plug wire.
Image 3.1: Primer bulb with a centimeter scale. This image provides a size reference for the primer bulb and its retaining ring.
Image 3.2: Primer bulb with an inch scale. This image provides an alternative size reference for the primer bulb from a top-down view.
4. Operation
The primer bulb is used to manually introduce fuel into the carburetor's intake system, assisting with cold starts or after the engine has run out of fuel.
- Cold Start: Before attempting to start a cold engine, press the primer bulb 3 to 5 times. Each press should cause the bulb to fill with fuel and then return to its original shape. Do not over-prime the engine, as this can flood the carburetor.
- After Running Out of Fuel: If the engine has run out of fuel, refill the fuel tank and then press the primer bulb several times until it feels firm and fuel is visible within the bulb. This ensures the carburetor bowl is refilled.
- Starting the Engine: After priming, proceed with your engine's standard starting procedure (e.g., setting the choke, pulling the starter cord).
5. Maintenance
Regular inspection of the primer bulb can help prevent starting issues.
- Visual Inspection: Periodically check the primer bulb for any signs of cracking, hardening, or deterioration. A damaged bulb may not create proper suction or seal, leading to starting difficulties.
- Functionality Check: Ensure the bulb returns to its original shape quickly after being pressed. If it remains collapsed or feels soft, it may indicate a leak or material fatigue.
- Replacement: Replace the primer bulb immediately if any damage or malfunction is observed. Using a faulty primer bulb can hinder engine performance and starting reliability.
6. Troubleshooting
If your engine is experiencing starting problems, the primer bulb could be a contributing factor.
| Symptom | Possible Cause | Solution |
|---|---|---|
| Engine does not start after priming. | Primer bulb is cracked or not sealing properly. | Inspect the primer bulb for visible damage. Replace if necessary. |
| Primer bulb does not return to shape or feels soft. | Material fatigue or a leak in the bulb. | Replace the primer bulb. |
| Engine floods easily when priming. | Over-priming or a faulty carburetor component. | Reduce the number of primer presses. If the issue persists, inspect the carburetor. |
7. Specifications
- Part Number: 694394
- Brand: Briggs & Stratton
- Material: Plastic
- Color: Multicolor (typically red bulb with white ring)
- Quantity: 1 unit per package
- Specific Product Use: Priming fuel systems in engines with pulse carburetors, especially lawnmowers.
- GTIN/UPC: 634041139315, 024847265507
- Manufacturer: Briggs and Stratton
Image 7.1: Briggs & Stratton Genuine Parts logo. This logo signifies the authenticity of the replacement part.
8. Warranty Information
This Briggs & Stratton product comes with a limited 2-year consumer warranty. For detailed terms and conditions, please refer to the official Briggs & Stratton warranty documentation or contact their customer support.
9. Customer Support
For further assistance, technical support, or to locate authorized service centers, please visit the official Briggs & Stratton website or contact their customer service department. Always provide your engine model and serial number when seeking support.
Official Briggs & Stratton Website: www.briggsandstratton.com