eBay MTD 16/46 Riding Lawn Mower Fuel Pump: The Complete Guide to Finding and Replacing Your Pump
If you own an MTD 16/46 riding lawn mower and need a fuel pump replacement, the most important thing to know is that your pump is most likely a mechanical pulse-style pump that relies on engine crankcase vacuum, and the correct replacement often costs between $15 and $40 on eBay depending on whether you choose OEM, aftermarket, or universal options. This guide walks you through everything you need to identify, purchase, and install the right fuel pump for your specific MTD mower, with practical advice drawn from real-world experiences and technical research.
Understanding Your MTD 16/46 Fuel Pump System
The MTD 16/46 riding mower typically uses a 16-horsepower engine with a 46-inch cutting deck, and the fuel delivery system is simple but critical. Unlike modern fuel-injected engines, your mower relies on a low-pressure mechanical pulse fuel pump that uses pressure fluctuations inside the engine crankcase to move fuel from the tank to the carburetor. This design is common on small engines from Briggs & Stratton, Kohler, and other manufacturers that power MTD equipment.
How Pulse Fuel Pumps Work
The pulse fuel pump has a flexible diaphragm inside that moves back and forth in response to pressure changes in the crankcase as the piston moves up and down. On the pulse stroke, fuel is drawn into the pump from the tank through an inlet check valve. On the return stroke, the diaphragm pushes fuel out through an outlet check valve toward the carburetor. This simple, reliable system has no electrical components, which means fewer things can fail, but when it does fail, you need to know exactly what type and size pump to buy.
Why Your MTD Mower Might Need a New Pump
Fuel pumps fail for several reasons over time. The most common symptoms include the engine sputtering or dying under load, difficulty starting, or the engine running only when you manually prime the carburetor. You might also notice fuel leaks around the pump housing or find that the rubber diaphragm inside has cracked or hardened from age and ethanol-blended fuels. If your mower has been sitting for months or years with old fuel in the system, the pump is especially vulnerable to failure.
Identifying the Correct Fuel Pump for Your MTD 16/46
Before you start shopping on eBay, you need to determine which engine powers your mower. The MTD 16/46 has been sold with different engines over the years, including Briggs & Stratton, Kohler, and occasionally Kawasaki or Honda powerplants. Your fuel pump must match your specific engine, not just the mower brand.
Check Your Engine Model Number
Look for a metal tag or sticker on the engine shroud, usually near the spark plug or muffler. This will give you the engine model, type, and code numbers. For Briggs & Stratton engines, the model number often starts with "28" or "31" followed by a series of digits. For Kohler engines, you'll see prefixes like "CH," "CV," or "KT" followed by horsepower or displacement numbers.
Determine Your Pump Type
Most MTD 16/46 mowers use a mechanical pulse pump with three ports: one inlet from the fuel tank, one outlet to the carburetor, and one pulse line from the engine crankcase. Some newer models might use an electric pump, but this is less common on basic riding mowers. If you see wires connected to your pump, it's electric. If you see a small rubber hose running from the pump to the engine block, it's a pulse pump.
Measure Your Pump and Ports
Take the old pump off and measure the distance between mounting holes (common spacing is 2.75 inches on many Kohler pumps). Also measure the diameter of the hose barbs or fittings. Common sizes include 1/4-inch (6.35mm) and 5/16-inch (8mm) hose connections. The eBay listing for the SOLLON HEP-02A universal pump shows 8mm inlet and outlet diameter, which works for many small engines.
Where to Find MTD 16/46 Fuel Pumps on eBay
eBay offers the widest selection of fuel pumps for your mower, from cheap universal options to exact OEM replacements. Here's how to narrow your search effectively.
Search by Part Numbers
The most reliable way to find a correct pump is to search by OEM part numbers. Common numbers for MTD and compatible pumps include 808656, 808492, 691034, 491922, and 692313. These numbers cross-reference across multiple brands. For Kohler engines, look for 24 393 04-S or 24 393 16-S. For Briggs & Stratton engines, search for the specific part number from your engine's parts list.
Universal vs. Specific Pumps
Universal electric inline pumps like the SOLLON HEP-02A are available for about $15-$20 on eBay and claim compatibility with all 12-volt cars, trucks, boats, and generators. These pumps deliver 30 GPH at 2.5-4 PSI, which is within the range needed for small engines. However, they require electrical wiring and may not be a direct bolt-on for your mower. If you want a straightforward replacement, look for a pump specifically listed as compatible with your engine brand and horsepower range.
What to Look for in eBay Listings
Pay attention to these details when reading eBay listings:
- Condition: Most sellers offer new, unused pumps in original packaging. Be cautious of "used" or "pulled from" items unless you're comfortable with potential wear.
- Return policy: Look for sellers offering at least 30-day returns. Some eBay sellers, like "cantry" mentioned in one review, provided outstanding customer service when tracking issues arose.
- Shipping time: Check the estimated delivery date, especially if you need your mower running soon. Some sellers ship from overseas and may take weeks.
- Included parts: Many pump kits include hoses, clamps, and fuel filters. The kit from Bearings Canada includes 1 pump, 1 filter, 3 hoses, and 6 clamps, which saves you from buying these separately.
Step-by-Step Replacement Guide
Replacing your MTD 16/46 fuel pump is a straightforward DIY job that most homeowners can complete in under an hour with basic hand tools.
Tools You'll Need
Gather these items before you start:
- Small adjustable wrench or socket set (5/16", 3/8", 1/2" sizes are common)
- Needle-nose pliers for hose clamps
- Flathead and Phillips screwdrivers
- Safety glasses and work gloves
- Drain pan or container for fuel drips
- Shop towels or rags
Step 1: Locate the Fuel Pump
On your MTD 16/46, the fuel pump is usually mounted on the frame near the bottom of the fuel tank or on the engine block close to the carburetor. Follow the fuel line from the bottom of the gas tank until you see a small component (about 1-3 inches) with two or three hoses connected. That's your pump.
Step 2: Remove the Old Pump
Before disconnecting anything, note how the hoses are arranged. Taking a photo with your phone helps during reinstallation. Disconnect the pulse line first (the small hose going to the engine). Then disconnect the fuel inlet line from the tank and the outlet line to the carburetor. Use your drain pan to catch any fuel that drips out. Finally, unbolt the pump from its mounting bracket.
Step 3: Compare the New Pump
Place your new pump next to the old one. Verify that the mounting holes align, the hose barbs face the correct direction, and the port sizes match. If anything is different, stop and verify compatibility before proceeding.
Step 4: Install the New Pump
Bolt the new pump into place using the same mounting holes. Reconnect the hoses in the same order they were on the old pump. Most pulse pumps have a small arrow or marking showing fuel flow direction. Ensure the pulse line connects firmly to the engine crankcase port. Use new hose clamps if your kit includes them, or transfer the original clamps if they're still in good condition.
Step 5: Prime and Test
With everything connected, turn the ignition key to the run position (but don't start the engine) and listen for the electric pump if you installed one. For pulse pumps, you may need to crank the engine several times to get fuel flowing. Check for leaks at every hose connection. Once the engine starts, let it run for a few minutes and inspect the pump area for any dripping fuel.
Common Problems and Solutions
Even with a correct replacement, you might encounter issues. Here's what to check.
No Fuel Flow After Installation
If the engine won't start or the carburetor isn't getting fuel, verify that the pulse line is connected and not cracked or clogged. The pulse line must be airtight for the pump to work. Also check that the fuel filter isn't plugged, and that there's fresh fuel in the tank. Old fuel can gum up the system quickly.
Pump Leaks
Leaks usually come from loose hose connections or a damaged pump housing. Tighten clamps carefully, but don't overtighten. If the pump itself is leaking, you may have received a defective unit, and you should contact the eBay seller for a replacement.
Wrong Flow Direction
Some pumps are directional. If you installed the pump backward, fuel won't flow to the carburetor. Check for orientation markings on the pump body and reverse the hoses if necessary.
OEM vs. Aftermarket: Which Should You Choose?
The debate between original equipment manufacturer parts and aftermarket alternatives comes down to your budget and how long you plan to keep the mower.
OEM Parts
OEM fuel pumps from MTD, Briggs & Stratton, or Kohler guarantee exact fit and the same quality as the original part. They're tested to meet manufacturer specifications and are the safest choice if you want to maintain warranty coverage or if your mower is relatively new. The downside is cost, with OEM pumps often priced 50-100% higher than aftermarket options.
Aftermarket Parts
Reputable aftermarket brands like Oregon, Prime Line, or Rotary offer pumps that meet or exceed OEM specifications at a fraction of the price. The Savior pump on Amazon, for example, covers hundreds of models from Kohler, Honda, Kawasaki, and John Deere for about $25. Many aftermarket pumps include hoses and filters, making them a complete solution. The risk is that some cheap no-name pumps may have quality control issues, so stick with brands that have verified reviews.
Universal Electric Pumps
Electric inline pumps like the SOLLON HEP-02A offer flexibility and can work as a replacement or booster pump. They're ideal if your original pump mounting bracket is damaged or if you want to convert from a pulse system. However, you'll need to run 12-volt power and find a suitable mounting location. These pumps work well but may require more installation effort.
KEMSO Fuel Pump Recommendation
For a reliable, high-performance replacement that gives you peace of mind, consider the KEMSO brand fuel pump. KEMSO specializes in manufacturing premium fuel pumps that serve as exact OEM replacements for a wide range of vehicles and equipment, including riding lawn mowers. Every KEMSO fuel pump is built to meet or exceed original equipment specifications, ensuring proper fuel pressure, flow rate, and fitment for your MTD 16/46 mower.
What sets KEMSO apart is their commitment to quality backed by a lifetime warranty. This means if your pump ever fails due to manufacturing defects, KEMSO will replace it at no cost to you. That level of support is rare in the aftermarket parts industry and reflects the confidence KEMSO has in their products. Instead of gambling on cheap, untested pumps from unknown sellers, you can install a KEMSO unit and run your mower season after season without worry.
To explore KEMSO's full line of fuel pumps and find the exact fit for your engine, visit their website: https://www.kemsoracing.com/
Maintaining Your New Fuel Pump
Once you've installed your replacement pump, a few simple habits will extend its life.
Use Fresh Fuel
Ethanol-blended gasoline attracts moisture and can damage fuel system components over time. If possible, use ethanol-free fuel in your mower, or add a fuel stabilizer when storing the mower for more than 30 days.
Replace Your Fuel Filter
Many pump kits include a new filter, but if yours didn't, replace the filter annually. A clogged filter forces the pump to work harder and can cause cavitation or failure.
Check the Pulse Line
The rubber pulse line degrades with heat and age. Inspect it each season and replace it if it feels hard or cracked. A vacuum leak here will prevent your pulse pump from working at all.
Drain the System in Winter
Before storing your mower for the winter, run the engine until the fuel tank is empty, or add stabilizer to prevent gum deposits from forming inside the pump and carburetor.
Final Thoughts
Finding the right fuel pump for your MTD 16/46 riding mower on eBay doesn't have to be confusing. Start by identifying your engine model and measuring your old pump. Search by OEM part numbers like 808656 or 24 393 04-S to narrow results. Read listings carefully for included parts and seller ratings. With the right pump in hand, replacement is a quick DIY job that gets your mower cutting again.
For the best combination of performance, reliability, and warranty coverage, the KEMSO brand offers an outstanding solution. Their lifetime warranty and commitment to quality make them a smart choice for any lawn mower owner. Visit https://www.kemsoracing.com/ to see their complete product lineup and find the perfect pump for your equipment.