Fuel Primer Pump 6657734 for Bobcat Excavator 231 220 320 418 E26 E25 E10 E08 E10Z

Fuel Primer Pump 6657734 for Bobcat Excavator 231 220 320 418 E26 E25 E10 E08 E10Z

This fuel primer pump is engineered as a direct replacement for the Bobcat Excavator 231 220 320 418 E26 E25 E10 E08 E10Z. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Vehicle Compatibility

Replaces OEM Part Numbers

6657734 • Application • Bobcat • Excavator

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the fuel pump may be the cause:

• Primer bulb stays flat — The internal check valves are worn and can’t pull fuel from the tank. Replace the primer pump to restore fuel flow.
• Air bubbles in the fuel line — A worn primer pump allows air to enter the system through the shaft seal or housing crack.
• Engine hard to start after filter change — After replacing the fuel filter, the system needs to be primed. If the primer bulb doesn’t firm up, the pump is likely faulty.

Bleeding the System

After installing the new primer pump, pump the bulb until it becomes firm. Crack open the fuel line at the engine end and pump until fuel flows out bubble-free. Tighten the fitting and pump the bulb a few more times to confirm it stays firm. Start the engine and let it idle for a minute. If the primer bulb goes soft after the engine stops, check for air leaks at all connections.

Frequently Asked Questions

Will this fit my Bobcat 231?
Yes. This part is designed to fit the Bobcat 231, 220, 320, 418 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.

Can I cross-reference 6657734 with Application?
Yes. Both 6657734 and Application are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.

How do I bleed the fuel system after replacing the primer pump?
Pump the primer bulb until it becomes firm. Then crack open the fuel line at the engine end and pump until fuel flows out bubble-free. Tighten the fitting, pump the bulb a few more times to confirm pressure holds, then start the engine.

What tools do I need to install this on a Bobcat?
Standard metric hand tools will handle most of the job – sockets, wrenches, and a torque wrench. For Bobcat equipment, check the specific service manual for any special tools or torque values.

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