Combination Diesel and DEF Slip Tank for Pickup: A Comprehensive Guide

[MikePhua]

In the world of heavy-duty trucks and equipment, efficiency and convenience are paramount. For fleet operators and individuals who rely on their pickups for transporting fuel and DEF (Diesel Exhaust Fluid), having a reliable system to handle both can be a game-changer. A combination diesel and DEF slip tank designed for a pickup offers a practical solution by allowing users to carry both types of fuel in a single unit. This reduces the need for multiple tanks and streamlines fuel management.
In this article, we will explore the benefits, considerations, and best practices for using a combination diesel and DEF slip tank in pickups. We'll also dive into some common features of these tanks and offer guidance on maintenance, installation, and safety.
What is a Combination Diesel and DEF Slip Tank?
A combination diesel and DEF slip tank is a custom-built fuel storage unit designed to fit into the bed of a pickup truck. It allows users to store and transport both diesel fuel and Diesel Exhaust Fluid (DEF) in one tank. These tanks are typically equipped with separate compartments for each type of fluid to prevent contamination between the two.

• Diesel: Diesel fuel is used to power diesel engines in trucks, construction equipment, and other heavy machinery.
  
• DEF: Diesel Exhaust Fluid is a solution used to reduce the amount of nitrogen oxide (NOx) emissions produced by diesel engines, especially in modern diesel vehicles that comply with stricter emissions standards.
  

The convenience of having both fluids in one compact system means less downtime for refueling and more efficient management of fuel resources.
Why Use a Combination Diesel and DEF Slip Tank?
For contractors, fleet managers, and other heavy equipment users, a combination slip tank is an ideal solution. Here’s why:

1. Efficiency: Transporting both diesel fuel and DEF in a single system eliminates the need for multiple tanks, reducing the time spent managing separate fuel sources.
   
2. Convenience: Operators no longer have to worry about running out of DEF when they refuel their diesel engines. With both fluids available on-site, they can refuel the engine and top up DEF at the same time.
   
3. Space-Saving: For those with limited truck bed space, a combination slip tank optimizes space and ensures that both fluids are securely stored.
   
4. Cost Savings: Having your own DEF and diesel on hand can save on delivery charges, especially for fleets operating in remote locations. It also ensures that you can keep fuel prices down by avoiding additional markups that come with purchasing DEF from service stations.
   

How Does a Combination Diesel and DEF Slip Tank Work?
The slip tank consists of two primary sections: one for diesel fuel and one for DEF. These sections are usually separated by a baffle or a physical divider to keep the two fluids from mixing. The system may include:

• Dual Pumping System: Some tanks are equipped with separate pumps for diesel and DEF. This ensures that the two fluids are dispensed independently, maintaining their integrity and ensuring there is no cross-contamination.
  
• Hoses and Nozzles: Hoses for each fluid are connected to the pump systems, allowing the operator to refuel both the diesel engine and the DEF tank in the vehicle or equipment.
  
• Level Indicators: Many tanks are equipped with gauges or sensors that monitor the level of each fluid, alerting the operator when one or both fluids are getting low and need to be refilled.
  
• Bulkhead Fittings: These fittings are often used to ensure that both fluids remain contained in their respective sections of the tank, preventing leaks or spills.
  

When using a combination slip tank, the process is relatively straightforward:

1. Drive your pickup truck to the fueling station or storage facility.
   
2. Attach the proper hose to your diesel engine and the DEF system.
   
3. Refuel the diesel and top off the DEF.
   
4. Secure the hoses, ensure that the levels are correct, and return to your work site.
   

Key Features of Combination Diesel and DEF Slip Tanks
When considering a combination slip tank, there are several important features and specifications that need to be considered to ensure it fits your needs:

1. Capacity: Depending on your requirements, you can find tanks with different capacities. Smaller systems typically offer around 50 to 100 gallons of combined storage, while larger systems can hold up to 200 gallons or more.
   • Diesel Capacity: Ensure the diesel section can hold an adequate amount of fuel for your daily operations.
     
   • DEF Capacity: DEF is used in smaller quantities, so the DEF section of the tank may be smaller than the diesel section, but it still needs to accommodate a sufficient amount for longer trips or equipment needs.
     
2. Material Construction: The tank should be made of durable materials like steel or high-density polyethylene (HDPE). These materials are resistant to corrosion, ensuring that both fuels remain safe and secure during transport.
   
3. Pump Systems: Tanks with built-in pumping systems can be highly beneficial, as they allow for easy dispensing of both fuels. Dual-pump systems allow for the simultaneous fueling of diesel and DEF.
   
4. Tank Divider: A physical divider between the diesel and DEF sections prevents cross-contamination, which is critical for DEF, as contamination can render it ineffective and cause damage to the vehicle’s selective catalytic reduction (SCR) system.
   
5. Portability and Mounting Options: Some combination tanks are designed to be easily removed and placed into different vehicles, while others may be designed for permanent mounting in a truck bed. Consider your operational needs when choosing the type of mounting system.
   
6. Regulatory Compliance: Ensure that the combination slip tank complies with local regulations for fuel storage and transportation. This includes adhering to safety standards and ensuring that the tank has proper venting, spill prevention, and overfill protection.
   

Installation and Maintenance
Proper installation and regular maintenance are critical to keeping your combination slip tank in top condition.

1. Installation Tips:
   • Secure Mounting: Ensure the tank is properly secured to the truck bed to prevent movement during transport.
     
   • Ventilation: The tank should have adequate ventilation to prevent pressure buildup from the diesel and DEF.
     
   • Proper Hoses and Fittings: Always use the correct hoses and fittings for both the diesel and DEF systems to prevent leaks and contamination.
     
2. Maintenance Tips:
   • Regular Inspections: Check the tank regularly for signs of leaks, damage, or wear, particularly around the hoses, seals, and pumps.
     
   • Cleaning: DEF tanks require cleaning more often than diesel tanks to prevent crystallization or contamination.
     
   • Pump Maintenance: Periodically check the pumps for functionality, ensuring they operate smoothly and that no clogging has occurred in the hoses or nozzles.
     
3. DEF Fluid Considerations: Since DEF can degrade over time, always ensure that it is stored in a cool, dry place and away from direct sunlight. Also, always use the freshest DEF available to ensure optimal performance in your diesel engines.
   

Safety and Compliance
When using a combination diesel and DEF slip tank, safety is a top priority. Follow these best practices:

1. Avoid Cross-Contamination: Always use separate nozzles for diesel and DEF. Never mix the two fluids, as DEF contamination with diesel will damage the emission system of the truck.
   
2. Handle Spills Carefully: If a spill occurs, clean it up immediately and follow environmental safety guidelines for fuel disposal.
   
3. Regular Inspections: Always inspect the tank for any signs of damage or leaks, particularly after long hauls or rough conditions.
   

Additionally, it is important to ensure that the tank complies with the U.S. Environmental Protection Agency (EPA) or other local regulations concerning fuel storage and transportation.
Conclusion
A combination diesel and DEF slip tank is a highly effective solution for operators who need both diesel fuel and DEF for their equipment but want to streamline their operations. By understanding the key features, installation requirements, and maintenance practices, you can ensure that your slip tank serves you efficiently and safely.
Whether you’re running a fleet of trucks or simply need an easy way to fuel your machinery during a project, a combination slip tank provides a space-saving, cost-effective, and convenient way to manage both diesel and DEF fluids on the go. With the right system in place, you can improve productivity, reduce downtime, and ensure compliance with emissions standards.