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A fast fuel transfer pump can save a lot of time on a farm, job site, or service truck, but the pump has to match your tank, power source, fuel type, and duty cycle. The Fill-Rite FR4204H is a heavy-duty 12V DC rotary-vane pump rated for up to 20 GPM, with cast-iron construction and a 2-inch bung mount for mobile transfer tanks. Its biggest strengths are its high flow rate, rugged build, and broad petroleum-fuel compatibility. The main catch is important: this is the pump-only version, so you need to plan for the hose, nozzle, suction setup, and electrical installation separately.
Quick Verdict
Rating: Recommended with caveats
Best For: Truck-bed transfer tanks, farm equipment, construction equipment, and buyers who already have or want to select their own transfer accessories.
Bottom Line: The FR4204H gives you a rugged 20 GPM platform with useful thermal protection and a durable cast-iron housing. It makes the most sense when you specifically want the pump-only configuration and are prepared to complete the fuel and electrical installation correctly.
| Specification | Detail |
|---|---|
| Brand | Fill-Rite |
| Model | FR4204H |
| Product type | 12V DC fuel transfer pump, pump-only configuration |
| Pump design | Rotary vane, self-priming |
| Maximum flow rate | 20 GPM / 75 LPM |
| Power | 12V DC, 0.25 HP motor, up to 19A |
| Duty cycle | 30 minutes on, 30 minutes off |
| Housing | Cast iron |
| Mount | 2-inch NPT bung mount |
| Inlet / outlet | 1-inch female NPT / 1-inch female NPT |
| Suction lift | Up to 8 ft |
| Discharge head | Up to 37 ft |
| Maximum operating pressure | 16 PSI |
| Compatible fluids | Diesel, kerosene, biodiesel up to B20, gasoline up to E15, and mineral spirits |
| Thermal protection | Yes |
| Assembled size | 8.4 x 13.7 x 6.5 in. |
| Assembled weight | 20.7 lb |
| Warranty | Limited lifetime warranty |
| Package note | Pump-only model with installation components; discharge hose, dispensing nozzle, and suction pipe are not part of the pump package |
What Is the Fill-Rite FR4204H?
The FR4204H is part of Fill-Rite’s heavy-duty FR4200 series. It is designed for 12V mobile fuel-transfer systems, especially transfer tanks mounted in truck beds, trailers, farm vehicles, and similar equipment. A 2-inch NPT bung mount connects the pump to a suitable tank, while the 1-inch inlet and outlet are designed around higher-flow transfer plumbing.
Its rotary-vane system is rated for up to 20 gallons per minute under suitable conditions. That makes it more appropriate for equipment with moderate-to-large fuel tanks than small portable refueling jobs where a lower-flow pump would be enough.
Before You Buy: FR4204H is the pump-only version. Do not assume a dispensing hose, nozzle, suction pipe, or meter is included. Check your complete installation plan before ordering.
Key Takeaways
- The cast-iron housing is designed for demanding mobile and field use.
- Maximum rated flow is 20 GPM, or 75 LPM.
- The pump runs from 12V DC power and draws up to 19A.
- Its specified duty cycle is 30 minutes on followed by 30 minutes off.
- It supports diesel, kerosene, biodiesel up to B20, gasoline up to E15, and mineral spirits.
- The 2-inch NPT bung mount suits compatible mobile transfer tanks.
- Thermal motor protection helps protect against overheating, but it does not turn the pump into a continuous-duty model.
- The pump-only package gives you flexibility, but it requires more accessory planning than a complete FR4200-series kit.
Who Should Buy It?
Best For
- Truck or trailer owners building a 12V mobile transfer-tank system.
- Farm, construction, fleet, or equipment users who benefit from up to 20 GPM transfer.
- Buyers who want to choose their own hose, nozzle, suction pipe, meter, or filter setup.
Skip If
- You want a complete ready-to-dispense package in one box.
- You need continuous-duty operation rather than a 30-minute on/30-minute off cycle.
- Your fuel, tank, electrical system, or mounting arrangement falls outside the manufacturer’s specifications.
Key Features and Build Quality
Cast-Iron Construction
The main pump housing is cast iron, which is a sensible material for a unit intended for truck beds, work sites, farms, and other exposed environments. At 20.7 pounds, the FR4204H is not a lightweight portable pump. Its design is better suited to a securely mounted tank installation.
Rotary-Vane Pump Design
Fill-Rite uses rotary-vane technology in the FR4200 series to provide consistent fuel-transfer performance. The FR4204H is rated for a maximum 20 GPM flow, although actual delivery can vary with fluid type, suction conditions, hose length, fittings, power supply, and other installation factors.
Built-In Strainer and Thermal Protection
A built-in mesh strainer helps keep larger particulates from entering the pump system. The motor is also thermally protected, adding protection if operating conditions cause excessive heat.
Thermal protection should not be treated as permission to ignore the specified duty cycle. The published operating cycle is 30 minutes on and 30 minutes off.
Rotatable Junction Box
The electrical junction box can rotate 180 degrees. That gives you more flexibility when the pump is mounted close to a toolbox, bed wall, tank bracket, or another obstruction.
Fit and Compatibility
The FR4204H uses a 2-inch NPT bung mount with 1-inch female NPT inlet and outlet connections. Before buying, confirm that your tank, suction arrangement, hose, fittings, and dispensing equipment match those connections.
Fluid compatibility is also specific. Fill-Rite lists diesel, kerosene, biodiesel blends up to B20, gasoline blends up to E15, and mineral spirits for the current FR4204H specification. Do not assume that another solvent, racing fuel, aviation fuel, or higher-percentage blend is suitable just because the pump handles gasoline or diesel.
Pro Tip: Build your accessory list before ordering the pump. Matching the 1-inch connections and 2-inch bung mount at the planning stage can prevent costly adapters, flow restrictions, or a second order for missing parts.
Performance and Real-World Use
The FR4204H combines a maximum rated 20 GPM flow with an 8-foot suction lift and up to 37 feet of discharge head. Those figures make it a practical fit for mobile tanks where the pump needs to move a meaningful amount of fuel without relying on AC power.
For Farm Equipment
For tractors and other machinery with larger fuel tanks, a 20 GPM pump can reduce refueling time compared with lower-flow portable pumps. The 12V design also makes sense when the installation is centered on a truck or trailer battery system.
For Construction and Job-Site Equipment
The cast-iron housing and mobile-tank format suit job-site use where the pump may be exposed to vibration, dust, weather, and repeated fueling cycles. The built-in strainer and metal switch-stop design are useful durability features in that environment.
For Service Trucks and Mobile Tanks
The 2-inch bung mount and rotatable junction box are especially relevant for truck-bed tanks where available mounting and wiring space can be tight. The main limitation is packaging: because FR4204H is the pump-only model, the rest of the dispensing system has to be selected separately.
For Repeated Daily Refueling
Fill-Rite describes the model for daily use, but the motor still has a 30-minute on/30-minute off duty cycle. That distinction matters for fleet operators or busy sites where multiple machines may need fuel back to back.
Installation, Maintenance, and Warranty
Installation and Electrical Setup
Correct installation matters as much as the pump itself. The unit is designed for a 12V DC electrical supply and requires appropriate circuit protection, grounding, wire sizing, and connections. Fill-Rite’s H-Series instructions call for proper grounding and a 30A fuse on 12V models. Electrical work should follow the manufacturer’s instructions and applicable electrical and fire-safety codes.
Do not rely on undersized vehicle accessory wiring. The manufacturer’s H-Series guidance specifically warns against attempting to power the pump through vehicle wiring smaller than 12 AWG, such as typical cigarette-lighter wiring.
Tank and Plumbing Setup
Keep the specified 8-foot maximum suction lift and 37-foot discharge-head rating in mind when planning the system. Excessive restrictions, small fittings, long hose runs, poor electrical supply, or difficult suction conditions can reduce real-world flow below the published maximum.
Maintenance
Routine inspection should focus on leaks, damaged wiring, loose connections, worn hoses or fittings, contamination, and signs of abnormal pump operation. The built-in strainer should be serviced according to the Fill-Rite manual rather than on an invented universal schedule.
Replacement parts and rebuild components are available through Fill-Rite’s dealer and distributor network, which is useful if you plan to keep the pump in service for years.
Warranty
The current FR4204H specification lists a limited lifetime warranty. Warranty coverage has terms and exclusions, so keep your purchase documentation and follow Fill-Rite’s current registration and claim instructions rather than assuming every wear item or installation problem is covered.
Compatibility and Safety
Fuel transfer equipment handles flammable or combustible liquids, so correct installation is a safety requirement rather than an optional upgrade. Use only approved tanks, hoses, fittings, nozzles, wiring methods, and grounding practices for your application.
Do not modify the pump to transfer an unapproved liquid. Follow the Fill-Rite installation manual, local fire and electrical requirements, and any workplace rules that apply to fuel storage and dispensing. If you are not qualified to install the electrical system, have the wiring completed by an appropriate professional.
The pump’s thermal protection, strainer, and rugged housing reduce certain operating risks, but they do not replace safe fuel handling, correct grounding, proper ventilation, or inspection for leaks.
Pros and Cons
Pros
- Up to 20 GPM rated flow for larger equipment and transfer tanks.
- Heavy-duty cast-iron housing.
- 12V DC design suits mobile truck and trailer installations.
- Thermally protected motor and built-in mesh strainer.
- Rotatable junction box makes tight installations easier to plan.
Cons
- Pump-only package means major dispensing accessories must be sourced separately.
- 30-minute on/30-minute off duty cycle is not suited to uninterrupted pumping.
- Correct electrical, plumbing, grounding, and fuel compatibility checks are essential.
Is It Worth the Price?
The FR4204H sits in the heavy-duty end of the 12V transfer-pump market rather than the small portable-pump category. Much of its value comes from the cast-iron build, 20 GPM rating, serviceable design, limited lifetime warranty, and established FR4200 platform.
It offers the strongest value when you already know which hose, nozzle, suction components, and optional meter or filtration components you want. If you would rather buy a more complete package with matched accessories included, paying for another FR4200 configuration may save installation planning and separate purchases.
How It Compares to Alternatives
The closest alternatives are other versions in Fill-Rite’s FR4200 family. The FR4210H keeps the same 12V, 20 GPM platform but is sold as a version with a nozzle and a more complete dispensing setup. The FR4211H goes further by adding a mechanical meter along with the nozzle and other transfer components.
The FR4204H therefore makes the most sense when you specifically want the core pump and prefer to build the rest of the system around your own requirements. If convenience is more important than customization, compare the bundled FR4200 variants before buying.
Frequently Asked Questions
Does the Fill-Rite FR4204H include a hose and nozzle?
No. FR4204H is the pump-only FR4200-series configuration. It includes installation components, but you should plan to source the appropriate suction pipe, discharge hose, dispensing nozzle, and any optional meter or filter needed for your system.
What fuels can the FR4204H transfer?
Fill-Rite currently lists diesel, kerosene, biodiesel up to B20, gasoline up to E15, and mineral spirits. Do not use the pump for another liquid unless Fill-Rite specifically approves that fluid for this model.
Can the FR4204H really pump 20 gallons per minute?
Twenty GPM is the manufacturer’s maximum rated flow. Your actual flow can be lower because of hose length, fittings, electrical voltage, suction conditions, fluid properties, filters, nozzles, and other restrictions in the completed system.
Can the FR4204H run continuously?
No. Its published duty cycle is 30 minutes on followed by 30 minutes off. The thermal protection is an additional motor-protection feature and should not be used as a substitute for following the specified duty cycle.
What tank connection does the pump use?
The FR4204H uses a 2-inch NPT bung mount. The pump also has 1-inch female NPT inlet and outlet connections, so verify your tank and transfer plumbing before ordering accessories.
How should the FR4204H be wired?
It is a 12V DC pump that must be properly grounded and protected according to Fill-Rite’s installation instructions. The H-Series manual specifies 30A circuit protection for the 12V system and warns against using undersized vehicle accessory wiring. Follow the manual and applicable electrical codes.
What are the suction and discharge limits?
Fill-Rite specifies up to 8 feet of suction lift and up to 37 feet of discharge head for the FR4204H. Those limits should be considered when positioning the pump and planning the rest of the fuel-transfer system.
Who should choose another FR4200 model instead?
Choose another configuration if you would rather receive more dispensing hardware with the pump. For example, FR4210H is a 20 GPM 12V version sold with a nozzle setup, while FR4211H adds a meter and nozzle package.
The Bottom Line
The Fill-Rite FR4204H is a strong choice when you need a rugged 12V pump capable of up to 20 GPM and want control over the accessories used in your transfer system. Its cast-iron housing, rotary-vane design, thermal protection, built-in strainer, and limited lifetime warranty suit demanding mobile use, but the pump-only packaging and 30-minute duty cycle make it less convenient for buyers who want a complete kit or uninterrupted operation.
