Product Overview

This high-precision Diesel Fuel Pump Plunger & Barrel Assembly (Models P300, P304, P305, P309) is a critical component for maintaining optimal fuel injection pressure in heavy-duty diesel engines. Manufactured in Shandong, China, with a monthly supply capacity of 100,000 pieces, we are a reliable partner for global distributors, repair shops, and construction machinery fleets. We export worldwide, serving major markets in North America, Europe, Southeast Asia, the Middle East, and South America, ensuring fast and efficient logistics from Qingdao and Tianjin ports.

Key Features & Benefits

• Precision Engineering: Manufactured to exacting tolerances to ensure consistent fuel metering and high injection pressure for optimal combustion efficiency.
• Superior Durability: Constructed from hardened alloy steel with a wear-resistant surface treatment, extending service life even under heavy load conditions.
• Direct Fitment: Designed as a direct OEM replacement for P300, P304, P305, and P309 series pumps, minimizing installation time and downtime.
• Enhanced Performance: Restores engine power, reduces fuel consumption, and lowers exhaust emissions by maintaining the correct fuel delivery curve.
• Cost-Effective Solution: Offers a high-quality alternative to original manufacturer parts without compromising on performance or reliability.

Technical Specifications

OEM Cross-Reference

This plunger and barrel assembly is a direct cross-reference for the following OEM part numbers:

• P300
• P304
• P305
• P309

Note: These numbers refer to standard industry sizes for plunger and barrel sets. Please verify your pump model (e.g., Bosch, Denso, Delphi) and the specific plunger diameter to ensure compatibility.

Compatibility

This assembly is designed for use in a wide range of diesel engines used in:

• Construction Machinery: Excavators, Bulldozers, Loaders
• Agricultural Equipment: Tractors, Harvesters
• Industrial Engines: Generators, Pumps, Compressors
• Truck & Bus Engines: Medium to Heavy-Duty applications

Please confirm your engine make, model, and pump type (e.g., in-line pump, VE pump) before purchasing. Contact our sales team for specific fitment verification.

Global Supply & Distribution

We are a dedicated exporter with a robust global supply chain. Our logistics team ensures timely delivery to major industrial hubs worldwide.

• Shipping Ports: Qingdao / Tianjin, China
• Major Markets: North America, South America, Europe, Middle East, Africa, Southeast Asia, and Oceania.
• Delivery Speed: Express (3-7 days), Air Freight (5-10 days), Sea Freight (15-35 days depending on destination).
• Customs Compliance: We provide all necessary export documentation (Commercial Invoice, Packing List, Bill of Lading/AWB, Certificate of Origin) for smooth customs clearance.

Quality Assurance

• Manufacturing Standards: Produced in an ISO 9001 certified facility using advanced CNC machining and grinding processes.
• Testing: Each unit undergoes strict dimensional inspection, surface finish analysis, and leak/pressure testing to ensure zero defects.
• Warranty: Backed by a 10-month warranty against manufacturing defects in materials and workmanship.
• Material: High-grade alloy steel, heat-treated for maximum hardness and wear resistance.

FAQ

Q1: How do I know if the P300/P304/P305/P309 set is the correct fit for my pump?
A: The P300, P304, P305, and P309 designations typically refer to specific plunger diameters or series. You must measure the diameter of your existing plunger (e.g., 9mm, 10mm, 11mm) or check the markings on your current barrel. If your part is labeled with one of these numbers, it is a direct fit. For unmarked pumps, please contact us with your pump model and engine details for cross-referencing.

Q2: What is the installation process for this plunger and barrel?
A: Installation requires specialized diesel injection service tools and knowledge. The process involves removing the old element, thoroughly cleaning the pump housing, lubricating the new barrel with clean diesel fuel, and carefully pressing it into place. The plunger must be aligned correctly with the control sleeve. We strongly recommend installation by a qualified diesel mechanic to prevent damage and ensure proper timing.

Q3: How should I store these plunger and barrel sets?
A: These precision parts are coated with anti-rust oil and packaged in sealed plastic. They should be stored in a cool, dry environment away from dust and moisture. Do not remove the protective packaging until immediately before installation. Avoid touching the precision-ground surfaces with bare hands, as skin oils can cause corrosion and performance issues.