Best Lift Pump for 6.7L Cummins Engines - Buyer's Guide

Introduction to Lift Pumps for the 6.7L Cummins Engine

The 6.7L Cummins turbo diesel engine first appeared in 2007.5 Dodge Ram 2500 and 3500 trucks. This powerful diesel motor is known for towing and hauling heavy loads while delivering excellent fuel economy. However, to keep a 6.7L Cummins running at peak performance, a properly functioning lift pump is critical.

What is a Lift Pump?

A lift pump, also called a transfer pump or feed pump, is an electric or mechanical pump that transfers diesel fuel from the vehicle's fuel tank to the high-pressure injection pump. The main functions of a lift pump include:

• Pulling diesel fuel from the tank and pushing it to the engine
• Filtration - removing water and particulates
• Pressurizing fuel for the injection pump
• Lubricating the injection pump

Without an operating lift pump, the fuel system cannot deliver the required volume of diesel at adequate pressure for proper combustion. This can lead to a loss of power, misfires, stalling and other driveability issues.

Signs You Need a New Lift Pump

Some warning signs that your 6.7L Cummins lift pump may be failing:

• Hard starting or long cranking before engine fires up
• Rough idle
• Lack of power under load
• Black smoke from exhaust
• Fuel starvation/low pressure code

Replacing a worn out lift pump as preventative maintenance is wise to avoid being stranded roadside. Running the fuel system too lean risks expensive damage to injectors.

Choosing the Best Lift Pump for 6.7 Cummins

When selecting a new lift pump for your Dodge Ram 6.7L Cummins application, here are some key factors to consider:

Electric or Mechanical

Both electric and mechanical pumps have pros and cons. Electric pumps directly replace the factory unit and integrate with the truck's fuel system. Mechanical pumps are more robust and can supply higher pressures. Either style pump is a reliable option.

Fuel Pressure Rating

Stock lift pumps on the 6.7L Cummins deliver around 5-10 psi at idle. For modified engines, an upgrade pump capable of 15-30 psi may be recommended. Too much pressure stresses components, so aim for the minimum PSI needed.

Brand Reputation & Reviews

Stick with reputable diesel brands known for quality fuel system components. Research feedback from other 6.7L Cummins owners to identify pumps with a solid track record.

Durability & Materials

Ensure the pump housing and internal parts can withstand corrosion and contaminants in diesel fuel. Quality lift pumps feature anodized aluminum, stainless steels, or coated steel construction.

Micron Filtration

The finer the fuel filtration, the better for your injection system. Look for pumps rated at 4-10 microns to capture damaging particulate.

Price

Expect to pay $150-$350+ for a well-built lift pump. Less expensive units likely won't hold up over time. This is not a parts to cheap out on.

Our Pick: Best Lift Pump for 6.7 Cummins Applications

Based on the above criteria, we recommend the FASS Titanium Signature Series lift pump for the Dodge 6.7L Cummins engine. Here's an overview:

• Type - Electric in-line pump
• Pressure - Adjustable up to 60 psi
• Filtration - 3 micron nominal
• Housing - Machined billet aluminum
• Warranty - 2 years
• Price - $$

The FASS Titanium pump consistently ranks among the best options for the 6.7L Cummins in terms of performance, durability, and value. The adjustable fuel pressure gives flexibility for stock or modified engines. And the fine 3 micron filter provides exceptional protection against fuel contaminants reaching your expensive injectors.

For truck owners wanting the peace of mind of a bulletproof lift pump system, the FASS Titanium Signature pump is a smart choice.

Runner Up: AirDog II-6.7 Cummins Lift Pump System

The AirDog II is another well-respected fuel lift pump recommended for the 6.7L Cummins application. The AirDog II stands out with its 150 gph flow rate, durable construction, and quiet operation. While more expensive than other options, the AirDog II reliably solves fuel supply issues with these high-performance diesel engines.

Getting the Most from Your Lift Pump

To maximize the lifespan of your new or refurbished lift pump on your Dodge Ram 6.7L Cummins:

• Change fuel filters regularly
• Use quality diesel fuel with lubricity additives
• Check fuel pressure gauges for adequate psi
• Inspect pump periodically for leaks/damage

Maintaining your lift pump system allows your high-hp Cummins engine to keep working hard for years to come.

For more support choosing the optimal lift pump or servicing your Dodge Cummins fuel system, the diesel technicians at F-Diesel are always available to help truck owners keep their rides running strong.

FAQs

What are the symptoms of a bad lift pump?

Common signs your lift pump is failing are hard starting, rough idle, lack of power, black smoke from the exhaust, and fuel starvation codes.

What fuel pressure do I need for a modified 6.7L Cummins?

Upgraded 6.7L Cummins engines often require 15-30 psi of fuel pressure at idle, so an aftermarket lift pump is recommended to supply adequate flow.

Are electric or mechanical pumps better?

Both types of pumps work well. Electric pumps directly replace the factory unit while mechanical pumps handle higher pressures but are a less factory-style solution.

How can I extend my lift pump life?

Regularly change fuel filters, use quality diesel with lubricity additives, install a fuel pressure gauge, and periodically inspect your pump system to maximize lift pump longevity.