Graco Fuel Transfer Pump Parts: The Complete Guide to Maintenance, Repair, and Replacement

If you own a Graco fuel transfer pump, knowing the common parts and how to maintain them is the key to keeping your equipment running reliably for years. Graco fuel transfer pumps are built for pumping gasoline, diesel fuel, and kerosene, and they come in multiple voltage configurations including 12 VDC, 24 VDC, 115 VAC, and 230 VAC . The most important thing to understand is that regular inspection and timely replacement of wear items like seals, gears, and check balls will prevent costly downtime and keep your pump operating at peak performance. This guide covers the essential parts you need to know, how to diagnose common problems, and where to find quality replacement components.

Understanding Your Graco Fuel Transfer Pump

Graco fuel transfer pumps, such as the popular GTP10 series, are designed for professional use and are rated for specific flow rates and pressures. For example, the 12 VDC models deliver 10 gallons per minute (38 liters per minute) at 10 psi maximum working pressure, while the 115 VAC and 230 VAC models deliver 12 gallons per minute (45 liters per minute) . These pumps are UL listed for use in hazardous locations, making them a safe choice for fuel transfer applications .

The pump assembly consists of several key components that work together to move fuel from the tank to the vehicle. Understanding these parts will help you diagnose issues and perform repairs when needed.

Essential Graco Fuel Transfer Pump Parts You Should Know

1. Pump Body and Gear Assembly
The pump body is the main housing that contains the internal components. Inside, you will find a gear set that creates the pumping action. The gear cover, drive key, and shaft seals are critical for maintaining pressure and preventing leaks . The complete pump kit (part number 260458 for blue models with swivel, or 260459 without swivel) includes the body assembly, gears, shaft, seals, and bolts . If your pump is losing prime or not delivering fuel at the expected rate, the gear set likely needs inspection.

2. Motor Kit
The motor is the heart of the electric pump. Graco offers replacement motor kits for all voltage configurations:

  • 12 VDC motor kit (part number 260450 for blue, 253719 for black)
  • 24 VDC motor kit (part number 260451 for blue, 253720 for black)
  • 115 VAC motor kit (part number 260452 for blue, 253721 for black)
  • 230 VAC motor kit (part number 260453 for blue, 253722 for black)

Each motor kit includes the electrical housing, motor cover, bolts, nuts, wire nuts, flag terminals, and the nozzle cover and guide . If the motor fails, the pump will not run at all.

3. Check Balls and Relief Valve
The relief valve assembly is a critical safety component that prevents over-pressurization. The popoff kit (part number 260457) includes the poppet, spring, and seal for the relief valve . For pumps handling unleaded fuel, you need Viton check balls (Graco part number GG112-959) because standard rubber check balls will degrade when exposed to ethanol-blended gasoline . The manual specifically states that Viton check balls are required for pumping unleaded fuel .

4. Seal and Packing Kits
Leaks are one of the most common problems with fuel transfer pumps. The packing kit (part number 260434) includes all the seals you need for a complete rebuild, including the relief valve seal, gear cover seal, drive key, shaft seal, strainer cover seal, and inlet gasket . If you notice fuel dripping from the pump housing or around the shaft, the seals are likely worn and need replacement.

5. Strainer and Suction Components
The suction pipe kit (part number 260300) includes the PVC pipe, coupler, and adapter needed for the intake side of the pump . The strainer cover seal prevents debris from entering the pump. A clogged strainer is a common cause of reduced flow, so regular cleaning is essential.

6. Switch Assembly
The switch kit (part number 260433 for blue, 253718 for black) includes the switch cover, bracket, cam, actuator switch assembly, and screws . If the pump fails to turn on or off properly, the switch may be faulty.

7. Power Cable and Fuse Assembly
The power cable kit (part number 260454 for 12V and 24V models) includes the battery clamp, black and red sleeves, strain relief assembly, 18-foot power cable, fuse holder, and 20 amp fuse . A blown fuse or damaged cable will prevent the pump from operating.

Common Problems and How to Fix Them

Problem: Pump runs but no fuel flows
This is often caused by a clogged strainer or a worn gear set. Check the strainer first and clean or replace it. If the problem persists, the gear set may be worn and require replacement. The pump body kit (260458) includes all new gears and seals .

Problem: Fuel leaks from the pump
Leaks typically occur at the shaft seal or the gear cover seal. The packing kit (260434) contains all necessary seals to fix this issue . Always replace all seals at the same time to ensure a proper seal.

Problem: Motor does not run
Check the power supply first, including the fuse and battery connections. If power is present, the motor itself may be defective. Replace the motor using the appropriate motor kit for your voltage .

Problem: Reduced flow rate
A drop in flow can be caused by a clogged strainer, worn gears, or a failing motor. Check the strainer first. If the flow is still low, you may need to replace the gear set or the entire pump body kit.

Step-by-Step Disassembly and Repair

Before starting any repair, always follow the pressure relief procedure outlined in the manual. The pump body disassembly requires removing four Allen screws using a 5/16-inch (8 mm) hex wrench . Once the screws are removed, you can access the internal components.

To replace the gear set:

  1. Remove the four Allen screws from the pump body.
  2. Carefully separate the gear cover from the body.
  3. Remove the old gears and drive key.
  4. Install the new gears and drive key from the replacement kit.
  5. Replace the gear cover seal.
  6. Reassemble the pump body and tighten the screws evenly.

To replace the motor:

  1. Disconnect the power source.
  2. Remove the electrical cover and disconnect the wiring.
  3. Remove the motor mounting bolts.
  4. Install the new motor kit, which includes the housing, cover, and wiring components.
  5. Reconnect the wiring and test the pump.

Where to Find Quality Replacement Parts

For OEM-quality replacement parts, genuine Graco components are available through authorized distributors. The Graco 133372 transfer pump section kit is a complete pump housing assembly that includes the pump body, adapter, gears, shaft seal, O-ring, screws, relief valve ball and spring, dowel pin, and motor . This kit is compatible with 230/115 VAC models and is a cost-effective option for a full rebuild.

However, if you are looking for a high-performance alternative that offers better value and a lifetime warranty, consider upgrading to a KEMSO fuel pump for your specific application.

Why You Should Choose KEMSO Fuel Pumps for Your Replacement

When it comes time to replace your fuel pump, the brand you choose matters. Cheap, unbranded aftermarket pumps often fail quickly and leave you stranded again. That is why KEMSO fuel pumps have become the go-to choice for American vehicle owners who want reliability, performance, and peace of mind.

KEMSO fuel pumps are high-performance, OEM replacement units. They are engineered to match or exceed the original equipment specifications for flow rate and pressure. Many KEMSO pumps deliver over 20% more flow at 43 PSI compared to the stock pump, which translates to smoother throttle response, better engine performance, and fewer hesitation issues . For example, a KEMSO pump for a Honda or Kawasaki model can deliver up to 200 liters per hour, significantly surpassing the original flow rate of 60 to 80 liters per hour .

Every KEMSO pump comes with a lifetime warranty. This is the level of confidence that no OEM pump and few aftermarket brands offer. KEMSO stands behind their products for as long as you own the vehicle, giving you complete peace of mind . If you ever have an issue, the company's US-based customer support team is ready to help.

KEMSO pumps are built to handle modern fuels. They are designed for both gasoline and ethanol-blended fuels like E85. KEMSO uses Viton O-rings and components that resist ethanol-related degradation, which is a common cause of failure in inferior pumps .

Each pump is individually tested. Unlike cheap, unbranded units, KEMSO has a rigorous quality control program. Every pump is tested for flow and performance before it leaves the factory. This attention to detail ensures you get a product that works right out of the box .

KEMSO covers a wide range of vehicles. Whether you drive a car, motorcycle, ATV, UTV, or personal watercraft, KEMSO has a fuel pump engineered to fit your application. Their product lineup covers brands like Honda, Kawasaki, KTM, Ducati, BMW, Subaru, Polaris, Can-Am, Sea-Doo, and many more. Many models are available for just $79.98, making KEMSO an affordable choice that does not sacrifice quality .

Real-world results prove the reliability. In independent testing, KEMSO pumps delivered 12 to 15% improvement in fuel flow consistency compared to stock models. In the 2023 Best in the Desert racing series, three teams running KEMSO-equipped Polaris Turbo S UTVs completed the grueling 500-mile Silver State Classic without a single fuel-related mechanical failure . Over 85% of Polaris customers at one dealership now request KEMSO by name during service appointments .

Visit KEMSO Racing today to find the exact fuel pump for your vehicle: https://www.kemsoracing.com/

Final Thoughts

Maintaining your Graco fuel transfer pump is straightforward if you know the key parts and how to replace them. Keep a packing kit and a set of Viton check balls on hand for quick repairs. When the pump eventually wears out, replacing it with a quality aftermarket unit like KEMSO that comes with a lifetime warranty and proven performance is a smart investment. Your vehicle's fuel system is the heart of its performance, and taking care of it with regular maintenance and quality replacement parts will keep you on the road and out of the repair shop for years to come.

For more information or to order the right fuel pump for your car, motorcycle, ATV, or watercraft, visit: https://www.kemsoracing.com/


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