Used Diesel Exhaust Fluid (DEF) Tanks, Pumps, Injectors & Brackets

Used DEF / AdBlue tanks, pumps, injectors & system components

Diesel Exhaust Fluid (DEF), often known as AdBlue in Europe, is a key part of the exhaust aftertreatment system on modern Euro 5 and Euro 6 trucks. DEF tanks, pumps, injectors and valves store and meter the fluid into the exhaust stream so that the SCR catalyst can reduce harmful NOx emissions and keep the vehicle compliant with emissions regulations. When any part of the DEF circuit fails, the truck can quickly lose power or enter a derate mode.

In this category we offer used OEM DEF / AdBlue tanks, pumps, injectors, valves, heaters and brackets removed from complete donor vehicles. Stock typically includes DEF tanks and tank brackets for DAF, MAN, Mercedes-Benz and Volvo trucks, AdBlue pumps and pump covers, heater coolant valves, dosing injectors and associated hardware.

What you will find in the DEF Systems category

Stock in the Diesel Exhaust Fluid (DEF) Systems category changes as new donor trucks arrive, but it typically includes:

• DEF / AdBlue tanks in common capacities, complete with level sender opening and mounting points;
• DEF pumps and dosing modules with electrical connectors and hose connections intact;
• DEF injectors / dosing valves that meter fluid into the exhaust upstream of the SCR catalyst;
• tank and line heaters, coolant valves and temperature sensors used to prevent DEF from freezing and to keep it within the correct operating range;
• DEF tank brackets, guards and covers including chassis-side brackets, pump covers and protective shrouds;
• associated pipes and hoses for DEF supply and return circuits where they are listed together with the main components.

Each listing includes clear photos, OE/OEM part numbers where available and donor vehicle details, so you can compare tank shape, bracket style, connector type and hose routing with the DEF components fitted to your own truck.

Truck brands & typical applications

Most DEF system parts in this category are taken from mainstream European heavy trucks, including:

• DAF XF and CF tractors and rigids with Euro 5 and Euro 6 SCR systems;
• MAN TGS and TGX long-haul, distribution and construction trucks;
• Mercedes-Benz Actros MP3, MP4 and MP5 tractors and rigids;
• Volvo FH and FM long-distance and regional haulage trucks;
• other brands such as Scania, Iveco and Renault when suitable donor vehicles are available.

Because these are genuine OEM components removed from complete vehicles, each DEF tank, pump or injector usually matches a specific chassis layout, exhaust configuration and emission standard, which is important for correct fit and reliable operation.

Why DEF & AdBlue system components matter

A healthy DEF system is essential for everyday operation of a modern HGV:

• Emissions compliance – correctly metered DEF allows the SCR catalyst to reduce NOx emissions to the level required by Euro 5 and Euro 6 standards;
• Power and drivability – many trucks will limit torque or speed if the DEF system is not operating correctly or if fluid level cannot be measured;
• Fuel efficiency & uptime – a stable, leak-free DEF circuit helps avoid repeated warning lights, derates and unscheduled workshop visits;
• Protection of expensive components – working DEF hardware helps prevent contamination and crystallisation inside the SCR catalyst and exhaust system.

Typical reasons to replace DEF tanks, pumps & injectors

Common reasons to order parts from this category include:

• dashboard warnings and fault codes related to the DEF tank level, pump pressure or dosing performance;
• fluid leaks from cracked tanks, damaged hoses, fittings or injector bodies;
• frozen or contaminated DEF leading to pump damage, blocked lines or crystallised deposits around the injector;
• physical damage to tanks, brackets or covers after accident damage, off-road use or contact with curbs and loading bay structures;
• replacing non-original, modified or failed parts with correct OEM DEF components matched to your truck brand and engine.

How to choose the correct DEF / AdBlue component

To minimise fitting issues and avoid repeat failures, please check the following details before ordering:

• truck brand, model and generation – for example DAF XF106, MAN TGX Euro 6, Mercedes Actros MP4, Volvo FH4;
• engine type and emission standard – Euro 5 and Euro 6 trucks often use different DEF tank sizes, pumps and dosing modules;
• tank capacity and mounting position – left/right chassis side, ahead of or behind the rear axle, and relationship to the diesel tank;
• connector and hose layout – electrical plugs, heater connectors and DEF line routing must match your existing installation;
• sensor and heater options – some tanks and pumps integrate level sensors, temperature probes and heaters that must be compatible with the truck’s wiring and ECU;
• OEM part numbers stamped or printed on your original DEF tank, pump, injector or bracket, matched against the references shown in the product description.

If you are unsure, you can contact us with your VIN or registration number and clear photos of your existing DEF components and mounting area. Our team can help you confirm compatibility before you place an order. For general guidance, see How to Find the Right Part and Compatibility & VIN Policy.

Used OEM DEF components from dismantled trucks

VRA Truckparts specialises in used OEM truck parts sourced from carefully selected donor vehicles. Trucks are inspected and documented before dismantling so that exhaust aftertreatment and DEF systems can be assessed. During dismantling, our technicians remove DEF tanks, pumps, injectors and brackets, check housings, connectors and mounting points for visible damage and reject units that do not meet our standards.

Usable components are drained, cleaned externally, labelled with OEM references where available and stored under cover in our warehouse ready for dispatch. To learn more about how we work, please visit Our Dismantling & Quality Process, Warranty & Part Condition, Trucks We Dismantle and Sustainability & Recycling.

Related air intake, fuel & emissions categories

If you are repairing or upgrading the emissions system on your truck, you may also want to browse:

• Exhaust & Emissions – DPF/SCR silencers, sensors and exhaust hardware that work together with DEF dosing;
• Fuel Tanks – diesel tanks that are usually mounted close to the DEF tank;
• Fuel Senders – fuel level sender units and pick-up modules for the main tank;
• Intercoolers – charge air coolers that form part of the wider engine efficiency and emissions package;
• Engines & Components – engines and control units that depend on a correctly functioning DEF system.

Delivery, payment & returns

Most DEF tanks, pumps, injectors and brackets can be shipped as well-packed parcels or palletised items with tracked delivery across the UK and EU. For details of available services, transit times and costs, please see our Delivery & Shipping page.

Information about payment methods, VAT handling and returns is available on Payment & VAT and Returns & Refunds. If you need to combine DEF components with exhaust, fuel or engine parts for the same vehicle, our team will be happy to help you build a complete order.