Product Overview

The fuel quantity control valve, OEM number A6420740484, regulates how much diesel fuel the high-pressure pump delivers into the common rail fuel system, controlling rail pressure to match engine demand. It operates constantly under high fuel pressure and repeated electrical cycling, so its internal components wear over time, which makes it a replacement item in the fuel system category.

A faulty fuel quantity control valve can cause incorrect rail pressure, rough running, and starting problems, so a properly functioning replacement matters. GSK Auto manufactures this control valve to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm the OEM number match before shipping.

Replacement OEM Numbers

(Note: We were unable to confirm the exact vehicle application for OEM A6420740484 from available records. Please confirm the correct part number and fitment with your supplier or parts catalog before publishing this listing.)

What Is a Fuel Quantity Control Valve?

Function: The fuel quantity control valve regulates the volume of diesel fuel the high-pressure pump feeds into the common rail, controlling fuel rail pressure to match the engine's current demand.

Working Principle: The engine control unit sends an electrical signal to the valve, adjusting how much fuel the high-pressure pump's internal plunger elements deliver to the common rail. By metering fuel intake rather than only regulating outflow, the valve helps the pump work efficiently while keeping rail pressure at the level the engine needs.

Importance: Correct rail pressure is essential to proper fuel atomization and combustion in a common rail diesel engine. A malfunctioning valve can cause rail pressure to run too high or too low, affecting starting, idle quality, and overall engine performance.

Common Failures & Signs: Check engine light with a fuel rail pressure or fuel metering trouble code. Hard starting or failure to start. Rough or unstable idle. Loss of power or poor acceleration. Excessive fuel consumption. Engine going into limp mode due to incorrect rail pressure.

Key Features

OEM-standard fitment - matches factory mounting and electrical connection for the OEM A6420740484 application.

Precision metering - built for accurate fuel delivery control.

Durable construction - built to withstand constant high-pressure fuel exposure.

Direct replacement - installs in place of the original valve, matched by OEM number.

Tested before shipment - every unit checked for proper function before packing.

Benefits

Importers - covers fuel quantity control valve demand from a single sourcing partner.

Wholesalers - a steady replacement item in the diesel fuel system category.

Repair Shops - tested units reduce comeback risk on a fuel system repair.

Distributors - private label packaging available for building a branded catalog.

Packaging & Shipping

Standard export cartons. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This control valve is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm the OEM number match before you order.

Call to Action

Sourcing fuel quantity control valves by OEM number? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.