Advanced Builds
Custom Pressure Washer Pumps
Recommended pumps for custom pressure washer builds, trailer setups, skid builds, and machine upgrades.
View Beginner Gear GuideCustom Build Pumps I'd Run (Or Currently Run)
These are the Canpump pumps I'd look at if you're building your own skid, trailer, or upgrading from a basic pressure washer. These are more advanced than buying a ready-to-run machine, so do your research before ordering. I have some resources linked below these pumps.
A replacement pump or custom pump setup can be a great move once you understand what you're building, but I would not tell a brand-new beginner to randomly buy one without knowing how it mounts, what engine shaft it fits, what gearbox/direct drive setup it uses, and what plumbing/unloader setup it needs.
Direct drive pumpsusually bolt directly to the engine shaft and spin at engine speed. They're simple and compact, but pulling from a buffer tank can be more annoying because they generally like to be force-fed or supplied really well.
Gear-driven pumps still slide onto a 1-inch engine shaft, but the gearbox reduces pump speed. In my experience, gear-drive setups are a sweet spot for trailer/skid builds because they can pull from a buffer tank with less headache than many direct-drive setups, while avoiding the extra pulley/belt alignment work of belt drive.
Before buying one of these, watch an install video and make sure you understand shaft size, mounting, keyway, unloader, inlet/outlet plumbing, and whether your engine has enough horsepower.
Prices shown are listed Canpump prices from when this page was added. Click through to confirm current pricing and availability.
Direct-Drive Pumps
Canpump CF 3257 G — 3200 PSI @ 5.7 GPM Direct Drive Pump
- 3200 PSI
- 5.7 GPM
- 1-inch shaft
- Direct drive
Strong flow for the money, but remember direct-drive pumps can be pickier about water supply. Make sure your inlet plumbing and water feed are dialed if you're trying to pull from a buffer tank.
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Canpump CF 3647 G — 3600 PSI @ 4.7 GPM Direct Drive Pump
- 3600 PSI
- 4.7 GPM
- 1-inch shaft
- Direct drive
Solid lower-cost direct-drive pump option if you're trying to repair or build a smaller machine. Just make sure the mounting, shaft, unloader, and inlet/outlet plumbing match what you're building.
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Canpump CF 4040 G — 4000 PSI @ 4 GPM Direct Drive Pump
- 4000 PSI
- 4.0 GPM
- 1-inch shaft
- Direct drive
Basic replacement/custom build pump for a 4 GPM style setup. Good if you're trying to build or repair a smaller machine, but still make sure the shaft, mounting, unloader, and plumbing match your engine/setup.
View on CanpumpGear-Driven Pumps
Canpump CE 3650 GB/GBP — 3600 PSI @ 4.4 GPM Gear Driven Pump
- 3600 PSI
- 4.4 GPM
- 1-inch shaft
- Gearbox reduction system
Good gear-driven option around the 4–4.5 GPM range. I'd look at this if you want something more serious than a basic homeowner setup but don't need huge flow yet.
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Canpump CT 4066 GB — 4000 PSI @ 6.61 GPM Gear Driven Pump
- 4000 PSI
- 6.61 GPM
- 1-inch shaft
- Gearbox reduction system
Good middle ground between a beginner 4–5 GPM machine and a huge 9+ GPM build. This is the kind of pump I'd consider for a serious trailer/skid upgrade.
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Canpump CT 3510 GB — 3500 PSI @ 9.2 GPM Gear Driven Pump
- 3500 PSI
- 9.2 GPM
- 1-inch shaft
- Gearbox reduction system
This is big flow. Not what I'd tell a random beginner to buy first, but if you're building a serious rig, 9.2 GPM is where production speed gets real. Make sure your plumbing, buffer tank, bypass, unloader, and engine setup are ready for it.
View on CanpumpResources
How To Install A Horizontal Pressure Washer Pump
Allparts Equipment & Accessories
How to Mount a Gearbox to an Engine Shaft
MPWSR / Thomas Moore — Useful for understanding shaft size, keyway, alignment, and mounting before buying a gear-drive pump.
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