Great Plains Industries (GPI)

What Sets GPI Apart in the Transfer Pump Category

Two design choices define GPI's competitive position in 12V transfer pumps: aluminum construction and a rotary gear mechanism.

The die-cast aluminum pump body is lighter than cast iron — the M-150 weighs around 24 lbs. — which matters when the pump is mounted to a 2-inch bung on a transfer tank that's bolted into a truck bed. Road vibration over years of daily use puts mechanical stress on the bung connection. A lighter pump reduces that stress and extends the life of both the pump mount and the tank. Aluminum also doesn't rust, which keeps the pump looking and functioning cleanly in truck bed and outdoor environments without the corrosion mitigation that heavier iron construction can require over time.

The rotary gear design uses fewer moving parts than competing vane-pump designs. Fewer parts means fewer wear points, longer intervals between service, and simpler maintenance when service is eventually needed. GPI makes individual replacement kits available for every serviceable component — motors, seals, vanes, gear covers, electrical covers — so a worn part doesn't require replacing the entire pump.

M-150 vs. EZ-8: Choosing the Right Pump for Your Tank

The M-150 Series at 15 GPM is the right pump for most truck bed transfer tank installations. At that flow rate, a 100-gallon tank empties in approximately seven minutes — fast enough for field refueling without being so high-volume that you need a controlled-flow nozzle for every use. The M-150 is designed for permanent bung-mount installation and is GPI's most specified pump for service truck, fleet, and agricultural transfer tank setups.

The EZ-8 at 8 GPM is the right choice when the application is smaller — a 30- or 40-gallon auxiliary tank in a pickup bed, a drum on a flatbed, or a portable fueling caddy. It delivers what GPI describes as gas-station-equivalent flow rates, which is genuinely useful context: 8 GPM is close to what a standard pump island dispenses, so fueling a piece of equipment from an EZ-8-equipped tank feels no slower than a fuel station stop. For operators who need portability and simplicity over high-volume throughput, the EZ-8 is the right tool.

The Spin Collar Mounting System

GPI's Spin Collar is a practical installation feature that gets overlooked in spec comparisons but earns appreciation in real installs. Most bung-mount pumps lock the pump body orientation at the point of threading into the tank — wherever the pump stops when tightened down is where the outlet, cord exit, and nozzle holder point. If that direction is inconvenient for the installation, you're stuck with it.

The Spin Collar separates the pump body from the bung fitting, allowing the pump to rotate freely after the bung adapter is installed and tightened. You tighten the bung first to seal the tank, then rotate the pump body to point everything where you actually want it, then lock it in place. On a truck bed install where space is tight and the cord needs to route a specific direction, this saves real time and frustration.

Gold Medal Performance — Independent Lab Testing

GPI has earned a Gold Medal Performance award through independent laboratory testing for the M-150 Series delivering significantly more operating hours than comparable competing pumps in the same class. GPI attributes this to the aluminum construction and rotary gear design reducing internal wear over time. All GPI pumps are factory-tested before shipping and backed by a 2-year warranty with UL Listing and CSA Certification on the motor.

Built in Wichita Since 1972

Great Plains Industries was founded by engineer Charlie Peer in 1968 and has been manufacturing in Wichita, Kansas since 1972. It remains a privately-held, family-founded company with over 200 employees producing GPI, GPRO, and FLOMEC branded products at the Wichita facility. GPI pumps are made in the USA.

GPI Frequently Asked Questions