Product Overview

This high-quality diesel fuel pump oil return screw (feed valve) is a direct replacement for Isuzu HP3 and HP4 fuel injection pumps. Manufactured to strict OEM specifications, part number 8-98074955-0 (also known as 8980749550) ensures reliable fuel pressure regulation and return flow in heavy-duty diesel engines. We ship globally to major markets including North America, Europe, Southeast Asia, the Middle East, and Africa, with fast delivery to industrial hubs and ports worldwide.

Key Features & Benefits

• Precision Engineering: Machined to exact OEM tolerances for a perfect seal and consistent fuel pressure.
• Durable Construction: Manufactured from hardened steel to withstand high-pressure fuel system cycles and resist wear.
• Direct Fitment: Plug-and-play replacement for the original Isuzu HP3/HP4 pump return valve assembly.
• Reliable Performance: Prevents fuel system pressure loss and ensures proper fuel return to the tank.
• Cost-Effective Solution: OEM-quality part at a competitive price point for fleet maintenance and repair shops.

Technical Specifications

OEM Cross-Reference

This component directly replaces the following OEM part numbers:

• Isuzu: 8-98074955-0
• Isuzu: 8980749550

Compatibility

• Fuel Pump Models: Isuzu HP3, Isuzu HP4, and compatible high-pressure common rail pumps.
• Engine Applications: Fits Isuzu diesel engines equipped with HP3/HP4 injection systems (including 4HK1, 6HK1, 4JJ1, 6UZ1 series).
• Vehicle Fitment: Suitable for Isuzu trucks, excavators, and industrial machinery using these pump systems.

Global Supply & Distribution

We provide fast and reliable shipping to industrial centers worldwide. Our logistics network supports delivery to North America (Los Angeles, Houston, Chicago), Europe (Rotterdam, Hamburg, Felixstowe), Asia-Pacific (Singapore, Shanghai, Sydney), the Middle East (Dubai, Jebel Ali), and Africa (Durban, Mombasa). Standard delivery time is 3-7 working days via DHL, TNT, UPS, EMS, or FEDEX. We have extensive export experience and ensure all customs documentation is properly completed for smooth international transactions.

Quality Assurance

• Manufacturing Standards: Produced in ISO-certified facilities with strict quality control processes.
• Testing: Each return valve is pressure-tested to ensure leak-proof operation and correct flow characteristics.
• Warranty: Backed by a 6-month warranty against manufacturing defects.
• Customer Support: 24-hour customer service available for technical inquiries and order support.

FAQ

Q: How do I know if this return valve fits my Isuzu HP3/HP4 pump?
A: This valve is a direct replacement for the OEM part number 8-98074955-0. Check your pump’s identification plate or existing part number. It fits all standard Isuzu HP3 and HP4 fuel injection pumps. If your pump uses a different return valve design, please verify the thread size and sealing surface match.

Q: What are the symptoms of a faulty fuel return valve?
A: Common symptoms include hard starting, excessive fuel pressure in the rail, fuel leaking from the pump return line, or engine stalling. A worn or stuck return valve can cause the HP3/HP4 pump to over-pressurize, leading to injector damage. Replacing this valve during pump service is recommended preventive maintenance.

Q: Can I install this valve myself, or do I need special tools?
A: Installation is straightforward for a qualified diesel mechanic. The valve screws into the pump housing and requires a standard socket or wrench. Ensure the sealing surfaces are clean and the valve is torqued to the pump manufacturer’s specification (typically 20-30 Nm). No special tools are required beyond standard hand tools. Always relieve fuel system pressure before removal.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .