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Milwaukee is making equipment maintenance a whole lot easier with the NEW M18 FUEL Grease Gun (3646-20) bare tool and kit (3646-21). Designed for technicians who handle high-volume greasing applications, this cordless grease gun delivers up to 60% faster pumping than competitive solutions, easier stuck coupler removal, and quicker reloads.

But the biggest news isn’t just how fast it pumps. Milwaukee is introducing new to world features, including a Max Pressure Indicator, Auto-Priming Valve, and Quick-Turn Canister, along with an integrated Back Pressure Release Lever that tackles one of the most frustrating parts of greasing equipment.

Whether you’re maintaining heavy machinery, agricultural equipment, or commercial fleets, these improvements are designed to reduce downtime and make everyday maintenance more efficient.

Up to 60% Faster Pumping with 16 Ounces Per Minute

When you’ve got dozens of grease fittings to service, speed matters.

Powered by Milwaukee’s POWERSTATE Brushless Motor, the new M18 FUEL Grease Gun delivers an industry-leading maximum flow rate of up to 16 ounces per minute, pumping up to 60% faster than competitive solutions.

That means less time spent at each zerk fitting and more time getting equipment ready for work.

The grease gun also features two operating speeds, allowing technicians to choose between maximum flow for faster dispensing and maximum pressure for more demanding applications.

For maintenance crews servicing multiple machines throughout the day, that flexibility can make a difference.

Back Pressure Release Lever: No More Fighting Stuck Couplers

Anyone who regularly uses a grease gun knows how frustrating it can be when a coupler gets stuck on a grease fitting.

Pressure can build up inside the connection, making it difficult to remove the coupler without struggling. Milwaukee addresses this with an integrated Back Pressure Release Lever, designed to deliver what Milwaukee calls the industry’s easiest stuck coupler removal.

When pressure builds up, technicians can activate the lever to release it, allowing for a smoother, more controlled disconnect from the zerk fitting.

Instead of wasting time trying to free a stuck coupler, users can release the pressure and move on to the next fitting.

It’s a simple improvement that solves a problem many maintenance professionals deal with every day.

Max Pressure Indicator for Easier Diagnostics

One of the standout innovations on the Milwaukee M18 FUEL Grease Gun is its Max Pressure Indicator.

When working with grease fittings that require higher pressure, it isn’t always obvious when you should change settings.

Milwaukee’s new indicator helps take the guesswork out of the process by signaling when it’s time to switch operating modes.
Combined with the grease gun’s two-speed design, technicians can more easily determine when to prioritize maximum flow or maximum pressure.

This helps make high-pressure greasing applications easier to diagnose while keeping the maintenance process moving.

Auto-Priming Valve Makes Reloading Easier

Changing a grease cartridge is one thing. Getting the grease gun properly primed afterward can be another. Traditional grease guns often require manual priming to remove trapped air before grease begins flowing consistently.

Milwaukee’s Auto Priming Valve is designed to eliminate that extra work.

The valve automatically vents trapped air to prime the grease tube, reducing the need for manual priming after a cartridge change.

It also retains grease within the valve, helping prevent messy reloads and wasted grease.

For technicians who go through several grease cartridges in a day, this means less time spent getting the tool ready and more time actually greasing equipment.

Quick-Turn Canister for Faster Reloads

Milwaukee didn’t just improve priming. They also redesigned how the grease canister is removed and installed.

The new Quick-Turn Canister allows technicians to quickly remove the canister, replace the grease tube, and reinstall it without spending unnecessary time on the process.

When combined with the Auto-Priming Valve, this creates a faster, more convenient cartridge-changing experience. Instead of dealing with lengthy tube changes and manual priming, users can reload and get back to work with fewer steps.

Built for Hard to Reach Grease Fittings

Not every grease fitting is easy to access, especially when you’re working around heavy equipment, machinery, or commercial vehicles.

The Milwaukee M18 FUEL Grease Gun features a 48“ swivel hose that provides greater flexibility and mobility when reaching fittings in tight or awkward spaces.

A built-in Low Grease Indicator also alerts users when the grease tube is nearing empty, giving technicians a heads-up before it’s time to reload.

Milwaukee’s REDLINK PLUS Intelligence helps protect the tool from overload, overheating, and over-discharge while maintaining performance during demanding applications.

And because the grease gun is fully compatible with Milwaukee M18 REDLITHIUM batteries and chargers, professionals already using the M18 system can add it to their existing cordless lineup.

Milwaukee is offering the new M18 FUEL Grease Gun in two configurations, giving technicians options depending on their existing cordless setup.

Milwaukee M18 FUEL Grease Gun (3646-20)

The 3646-20 is available as a bare tool with a listed price of $429.00

This option is ideal for professionals who already own compatible Milwaukee M18 batteries and chargers and want to add the new grease gun to their maintenance equipment.

Milwaukee M18 FUEL Grease Gun Kit (3646-21)

For those looking for a complete setup, this kit comes with everything you need to get started: one M18 FUEL Grease Gun, one M18 HIGH OUTPUT XC5.0 Resistant Battery (48-11-1855R), one M18 & M12 Charger (48-59-1812), and a Bulk Fill Zerk.

Is the New Milwaukee M18 FUEL Grease Gun Worth the Upgrade?

For technicians maintaining heavy equipment, commercial vehicles, agricultural machinery, or entire fleets, the new M18 FUEL Grease Gun is designed around problems that come up every day.

The faster pumping speed helps reduce time spent on each fitting. The Back Pressure Release Lever makes stuck couplers easier to disconnect. The Max Pressure Indicator helps users recognize when to switch modes. And the Auto-Priming Valve and Quick-Turn Canister make cartridge changes faster and less messy.

What makes this grease gun interesting isn’t just one individual feature. It’s how Milwaukee has addressed the entire greasing process, from pumping to disconnecting and reloading.

For professionals who grease equipment in high volumes, those improvements can add up to less downtime and a more efficient maintenance routine.

The new Milwaukee M18 FUEL Grease Gun (3646-20 and 3646-21) brings faster pumping, easier stuck coupler removal, and several new to world innovations to Milwaukee’s M18 cordless lineup. Interested in upgrading your grease gun? Shop now at Ohio Power Tool. Don’t hesitate to reach out at cs@ohiopowertool.com or 614-481-2111 with any questions, comments, or concerns, and be sure to follow us on all your favorite social media channels to stay in the know on all the latest announcements, deals, news, and more!