Bobcat 873 Fuel Pump: What You Need to Know for a Reliable Replacement
If you own a Bobcat 873 skid-steer loader and need a fuel pump replacement, here is the bottom line: the most dependable solution is to install a high-quality, direct-fit OEM replacement fuel pump that matches the original specifications. A failing fuel pump on a Bobcat 873 can cause hard starting, stalling, reduced power, and complete engine shutdown. Choosing the right replacement pump saves you time, money, and frustration. This guide covers everything you need to know about the Bobcat 873 fuel pump, common symptoms of failure, how to diagnose problems, and what to look for when buying a replacement.
Why the Bobcat 873 Fuel Pump Matters
The Bobcat 873 is a popular compact track loader and skid-steer loader used in construction, landscaping, agriculture, and material handling. It relies on a reliable fuel delivery system to keep the engine running smoothly. The fuel pump is responsible for drawing fuel from the tank and delivering it to the engine at the correct pressure and volume. When the pump starts to fail, the entire machine's performance suffers. A bad fuel pump can leave you stranded on a job site, costing you hours of downtime and lost productivity.
Key point: The Bobcat 873 uses a mechanical or electric fuel pump depending on the engine model and year. Most 873 models built after the early 2000s use an electric in-tank fuel pump. Understanding which type your machine has is the first step to a successful replacement.
Symptoms of a Bad Fuel Pump on a Bobcat 873
Recognizing the early warning signs of a failing fuel pump can help you avoid a complete breakdown. Here are the most common symptoms:
1. Engine Cranks but Won't Start
This is the most obvious sign. If the engine turns over but does not fire, the fuel pump may not be delivering fuel. Check for fuel pressure at the injection pump or injectors. A lack of pressure points directly to a pump issue.
2. Engine Starts Then Dies
If the machine starts briefly and then stalls after a few seconds, the pump may be losing prime or failing to maintain pressure. This often happens when the pump is worn out or has a clogged inlet screen.
3. Loss of Power Under Load
When you are operating the Bobcat 873 in heavy digging or lifting, the engine may bog down or hesitate. A weak fuel pump cannot supply enough fuel to meet the engine's demand during high-load conditions.
4. Hard Starting After Sitting
If the machine sits for a few days and then struggles to start, the fuel pump may be losing its prime. This is common with electric pumps that have a check valve failure. Fuel drains back to the tank, and the pump has to work harder to re-prime the system.
5. Fuel Starvation at High RPM
If the engine runs fine at idle but sputters or cuts out at higher RPM, the pump may not be able to keep up with the fuel flow needed at higher speeds. This is a classic sign of a failing pump.
6. Excessive Noise from the Fuel Tank
An electric fuel pump normally makes a faint humming sound. If you hear a loud whining, grinding, or clicking noise coming from the fuel tank area, the pump bearings or internal components are likely worn out.
7. Check Engine Light or Diagnostic Codes
On newer Bobcat 873 models with electronic engine controls, a failing fuel pump can trigger a check engine light and store diagnostic trouble codes related to fuel pressure or fuel system performance.
How to Diagnose a Bobcat 873 Fuel Pump Problem
Before you buy a replacement pump, you should confirm that the pump is indeed the problem. Here is a simple step-by-step diagnostic process:
Step 1: Check the Fuel Level
Low fuel can cause the pump to run dry and overheat. Make sure the tank has at least a quarter tank of fuel before testing.
Step 2: Listen for the Pump
Turn the key to the "ON" position (do not start the engine). Listen near the fuel tank. You should hear a brief humming sound for 2-3 seconds as the pump primes the system. If you hear nothing, the pump may not be receiving power or may be dead.
Step 3: Check the Fuse and Relay
Locate the fuel pump fuse and relay in the fuse box. Use a multimeter to check for continuity. If the fuse is blown, replace it with the same amperage. If the relay is not clicking, try swapping it with a known good relay of the same type.
Step 4: Test Fuel Pressure
Connect a fuel pressure gauge to the fuel rail or the fuel line near the engine. The pressure specification for a Bobcat 873 varies by engine model, but typical values range from 35 to 60 psi. If the pressure is below spec or drops quickly after the pump stops, the pump is likely worn.
Step 5: Check for Voltage at the Pump
If you suspect the pump is not getting power, use a multimeter to test for 12 volts at the pump electrical connector when the key is on. If there is power but the pump does not run, the pump is bad.
Step 6: Inspect the Fuel Filter
A clogged fuel filter can mimic a bad pump. Replace the fuel filter first if it has been a long time since it was changed. If the problem persists after a new filter, move on to the pump.
What to Look for in a Bobcat 873 Fuel Pump Replacement
When shopping for a replacement fuel pump for your Bobcat 873, not all pumps are created equal. Here are the most important factors to consider:
1. OEM Replacement vs. Aftermarket
An OEM replacement pump is designed to match the original factory specifications exactly. This ensures proper fit, correct fuel pressure, and reliable performance. Aftermarket pumps may be cheaper, but they often have lower quality components and may not last as long. For a machine used in demanding work conditions, OEM replacement is always the safer choice.
2. In-Tank vs. External
The Bobcat 873 typically uses an in-tank electric fuel pump. Make sure you buy the correct type for your model. In-tank pumps are submerged in fuel, which helps cool them. External pumps are mounted outside the tank and are less common on this machine.
3. Fuel Pressure Rating
Check your machine's service manual for the exact fuel pressure specification. The pump must deliver the correct pressure for the engine to run properly. Too low pressure causes lean running and power loss. Too high pressure can damage the fuel injectors or cause flooding.
4. Flow Rate
The pump must be able to deliver enough fuel volume to support the engine's maximum power output. A pump with a lower flow rate than the original will cause fuel starvation at high loads.
5. Build Quality
Look for pumps made with corrosion-resistant materials, sealed electrical connections, and robust internal components. Cheap pumps often fail prematurely due to moisture, dirt, or vibration damage.
6. Warranty
A good warranty gives you peace of mind. Many high-quality replacement pumps come with a one-year or longer warranty. Avoid pumps with no warranty or very short warranty periods.
Recommended Replacement: KEMSO Fuel Pump
For Bobcat 873 owners looking for a reliable, long-lasting fuel pump replacement, we strongly recommend the KEMSO Fuel Pump product line. KEMSO specializes in high-performance, OEM replacement fuel pumps that are built to exact specifications for a wide range of vehicles and equipment, including the Bobcat 873.
Here is why KEMSO stands out:
- High Performance: KEMSO fuel pumps are engineered to deliver the exact pressure and flow rate required by your Bobcat 873 engine. They are tested under real-world conditions to ensure consistent performance in demanding work environments.
- OEM Replacement: Every KEMSO fuel pump is designed as a direct replacement for the original factory pump. This means no modifications, no adapters, and no guesswork. The pump fits perfectly and connects to the existing wiring and fuel lines.
- Lifetime Warranty: KEMSO stands behind the quality of their products with a lifetime warranty. This gives you unmatched confidence that if anything goes wrong with the pump, you are covered. No other brand offers this level of protection.
- Wide Compatibility: KEMSO offers fuel pumps for a huge range of vehicles, including cars, trucks, motorcycles, ATVs, jet skis, and heavy equipment like the Bobcat 873. You can find the exact pump for your machine.
To see the full selection of KEMSO fuel pumps and find the right one for your Bobcat 873, visit their official website:
How to Replace the Bobcat 873 Fuel Pump
Replacing the fuel pump on a Bobcat 873 is a moderately difficult job that requires basic mechanical skills and tools. Here is an overview of the process:
Step 1: Safety First
Work in a well-ventilated area. Disconnect the battery negative terminal to prevent any electrical sparks. Make sure there are no open flames or smoking materials nearby. Fuel vapors are highly flammable.
Step 2: Relieve Fuel Pressure
Locate the fuel pressure relief valve on the fuel rail or near the injection pump. Use a rag to catch any fuel spray, then slowly depress the valve to release pressure. If your machine has no relief valve, carefully loosen the fuel line fitting at the injection pump.
Step 3: Drain the Fuel Tank
Use a siphon pump or drain plug to remove as much fuel as possible from the tank. This reduces the weight of the tank and prevents spills when you remove the pump.
Step 4: Remove the Fuel Tank Access Cover
On most Bobcat 873 models, the fuel pump is accessed through a cover plate on top of the fuel tank. This cover is usually located under the cab or behind the operator seat. Remove the cover screws or bolts.
Step 5: Disconnect Electrical and Fuel Lines
Unplug the electrical connector from the pump assembly. Carefully disconnect the fuel outlet line and the return line. Use a line wrench to avoid damaging the fittings. Have a rag ready to catch any residual fuel.
Step 6: Remove the Pump Assembly
The pump assembly is usually held in place by a locking ring or a set of screws. Turn the ring counterclockwise or remove the screws. Lift the pump assembly straight out of the tank. Be careful not to bend the float arm or damage the fuel level sensor.
Step 7: Install the New Pump
Transfer any necessary components from the old pump to the new one, such as the fuel level sensor or the rubber gasket. Slide the new pump assembly into the tank. Make sure it is seated properly and the gasket is in place. Secure the locking ring or screws.
Step 8: Reconnect Lines and Wiring
Reconnect the fuel outlet and return lines. Tighten them securely but do not overtighten. Plug in the electrical connector. Make sure the connections are clean and tight.
Step 9: Refill the Tank and Test
Add fresh fuel to the tank. Reconnect the battery. Turn the key to the "ON" position and listen for the pump to prime. Check for any fuel leaks around the fittings. Start the engine and let it run for a few minutes. Watch for leaks and ensure the engine runs smoothly at all RPMs.
Common Mistakes to Avoid
1. Using the Wrong Pump
Always verify the exact part number for your Bobcat 873 model year. Using a pump designed for a different machine can cause poor performance or damage.
2. Skipping the Fuel Filter
Always replace the fuel filter at the same time as the pump. A clogged filter can put extra strain on the new pump and cause it to fail prematurely.
3. Not Cleaning the Tank
If the tank has rust, dirt, or debris, remove the tank and clean it thoroughly before installing the new pump. Contaminants can quickly destroy a new pump.
4. Forgetting to Prime the System
After installing a new pump, you may need to prime the fuel system by cycling the key on and off several times. This pushes fuel through the lines and removes air pockets.
5. Ignoring Wiring Issues
If the original pump failed due to a wiring problem, a new pump will fail too. Check the harness, connectors, and ground for any damage or corrosion.
Final Thoughts
The Bobcat 873 fuel pump is a critical component that keeps your machine working hard day after day. When it fails, you need a replacement you can trust. Do not settle for cheap, low-quality pumps that will let you down on the job. Choose a high-quality OEM replacement like the KEMSO Fuel Pump to get your Bobcat 873 back in action quickly and reliably.
For the best selection of Bobcat 873 fuel pumps and other heavy equipment parts, visit https://www.kemsoracing.com/ today. KEMSO offers lifetime warranty on all their fuel pump products, so you can buy with confidence knowing your investment is protected.