Detailed Analysis of Bobcat Fuel Pump (Part #7256789)
1. Structural Characteristics
The Bobcat 7256789 fuel pump is an electric in-tank fuel pump designed for efficient fuel delivery in heavy-duty equipment. Its key structural features include:
Pump Type: Brushless DC electric motor (for longer lifespan and reduced wear).
Housing Material: Durable aluminum or high-grade plastic (resistant to fuel corrosion and vibration).
Filter Screen: Integrated fine mesh pre-filter to prevent debris from entering the fuel system.
Pressure Regulator: Built-in regulator to maintain consistent fuel pressure (typically ~50-60 PSI for common rail diesel systems).
Connector & Wiring: Sealed electrical connector (weatherproof and resistant to oil/fuel exposure).
Mounting Style: Direct in-tank installation (submerged in fuel for cooling and lubrication).
2. Technical Advantages
High Efficiency: Optimized flow rate (varies by model, typically 30-50 GPH) ensures sufficient fuel supply under heavy loads.
Durability: Designed for rugged environments (resistant to dust, moisture, and temperature extremes).
Precision Fuel Delivery: Maintains stable pressure for Doosan D34 engines, ensuring optimal combustion and reduced emissions.
Low Noise & Vibration: Brushless motor design minimizes operational noise compared to traditional fuel pumps.
Compatibility: Direct-fit replacement for multiple Bobcat and Doosan-powered machines.
3. Application Scenarios
This fuel pump is used in skid steers, compact track loaders, and utility vehicles operating in:
Construction sites (high dust/debris environments)
Agriculture & Landscaping (variable load conditions)
Snow removal & Road maintenance (cold-weather operation)
Industrial material handling (continuous heavy-duty cycles)
4. Compatible Equipment Models
| Machine Type | Models |
|---|
| Skid Steer Loaders | S740, S750, S770, S850 |
| All-Wheel Steer | A770 |
| Toolcat Utility | T740, T750, T770, T870 |
| Versa Handlers | V519, V723 |
| Doosan Engines | D34 (used in some Bobcat machines) |
Conclusion
The Bobcat 7256789 fuel pump is a high-performance, durable component essential for maintaining fuel system reliability in demanding conditions. Its brushless motor, corrosion-resistant housing, and precise pressure regulation make it ideal for Bobcat’s heavy-duty equipment lineup.
Common Problems & Reasons for Bobcat Fuel Pump (7256789) Failure
1. Common Failure Symptoms
Engine Cranking But Not Starting → Fuel pump not delivering fuel.
Loss of Power Under Load → Insufficient fuel pressure/volume.
Engine Stalling or Surging → Intermittent fuel supply.
Whining or Humming Noise from Fuel Tank → Pump motor struggling.
Check Engine Light (Fuel Pressure Codes) → P0087 (low pressure) or P0088 (high pressure).
2. Root Causes of Failure
| Problem | Likely Cause |
|---|
| No Fuel Delivery | - Burned-out pump motor (electrical failure)
- Clogged fuel filter/screen
- Blown fuse or relay issue |
| Low Fuel Pressure | - Worn pump internals (brushes/motor)
- Faulty pressure regulator
- Leaking fuel line or injector |
| Overheating & Early Failure | - Running on low fuel (pump not submerged)
- Contaminated fuel (water/dirt)
- Excessive voltage (bad wiring/alternator) |
| Intermittent Operation | - Corroded electrical connectors
- Damaged wiring harness
- Weak fuel pump relay |
Maintenance & Prevention Tips
1. Regular Inspection & Care
✅ Check Fuel Quality – Avoid dirty or watered-down diesel; use a fuel conditioner if needed.
✅ Keep Fuel Tank Above 1/4 Full – Prevents pump overheating (fuel cools the motor).
✅ Replace Fuel Filters – Clogged filters force the pump to work harder (follow Bobcat’s service intervals).
✅ Inspect Electrical Connections – Look for corrosion, loose wires, or damaged connectors.
2. Troubleshooting Steps Before Replacement
🔧 Test Fuel Pressure – Use a gauge (should be ~50-60 PSI for D34 engines).
🔧 Check Voltage at Pump – Should be 12V+ when ignition is on.
🔧 Listen for Pump Prime – A 2-3 second hum at startup indicates it’s working.
🔧 Swap Relay/Fuse – Rule out electrical issues before condemning the pump.
3. When to Replace the Pump
⚠️ If:
Final Recommendations
Use OEM or High-Quality Aftermarket Pumps – Rsolid
Avoid Ethanol Blends – Can degrade seals in diesel systems.
Store Machines Properly – If unused for long periods, add fuel stabilizer.
