Description
Fluids Do Not Cooperate. They Must Be Commanded.
Every mechanic has performed the ritual: a mouthful of gasoline from a siphon hose, diesel-soaked gloves from a hand pump that leaked at the seal, an oil pan that overflows because gravity feeds faster than the drain plug can be rethreaded. The Fluid Marshal ends this indignity. Its 12V/24V DC impeller pump transfers fuel, diesel, engine oil, and hydraulic fluid at a governed 1-4 liters per minute — fast enough to drain a motorcycle tank in 90 seconds, slow enough that you never lose control of the stream.
The pump head is a self-priming rotary vane design with a PTFE-impregnated impeller — chemically inert to gasoline, diesel, ethanol blends, and most hydraulic fluids. The automatic shutoff sensor in the intake wand detects air (empty tank) and cuts power within 2 seconds, preventing dry-run damage that kills lesser pumps on their first job. The alligator-clamp power leads connect directly to any 12V car battery or 24V truck/marine battery without a separate power supply. A 6.5-foot delivery hose with a swivel spout clips to the side of any drain pan or jerry can. At 1.8 pounds, it lives in the bottom drawer of your tool chest — not on a shelf in the garage because it is too awkward to retrieve.
You have earned the right to keep fuel out of your mouth.
Key Features
✦ Self-Priming Rotary Vane Pump: PTFE impeller rated for gasoline, diesel, kerosene, engine oil, hydraulic fluid, and ethanol blends up to E85 — no chemical degradation after extended fuel contact
✦ Auto-Shutoff Dry-Run Protection: Air-detection sensor in the intake wand stops the motor within 2 seconds of an empty tank — prevents impeller burnout from running dry
✦ Dual Voltage 12V/24V: Works with passenger vehicle batteries (12V), heavy truck batteries (24V), and marine deep-cycle systems — auto-detects input voltage
✦ 1-4 L/min Governed Flow: Variable speed impeller adjusts to fluid viscosity — thinner fluids (gasoline) flow faster; thicker fluids (cold engine oil) flow slower but never stall
✦ 6.5ft Delivery Hose: Reinforced PVC with swivel spout clip — reaches from engine bay to drain pan without repositioning the pump
✦ Compact 1.8 lb Body: Fits in a tool chest drawer alongside wrenches and sockets — grab it, clamp it, drain it, stow it
✦ Inline Mesh Filter: 80-micron stainless screen in the intake wand catches particulate before it reaches the impeller chamber
Technical Specifications
- Pump Type: Self-priming rotary vane, PTFE impeller
- Flow Rate: 1-4 L/min (governed, viscosity-dependent)
- Power Input: 12V DC / 24V DC (auto-detecting)
- Max Current Draw: 5A @ 12V / 3A @ 24V
- Compatible Fluids: Gasoline, diesel, kerosene, engine oil (0W-20 to 20W-50), hydraulic fluid, ethanol blends (E10-E85), water
- Intake Wand Length: 18 inches (45cm) flexible corrugated tube
- Delivery Hose: 6.5 ft (2m) reinforced PVC, 3/8-inch ID
- Dry-Run Protection: Air sensor cut-off within 2 seconds
- Filter: 80-micron stainless steel intake screen
- Weight: 1.8 lbs (0.82 kg)
Application Scenarios
The Fluid Marshal earns its keep in the garage, at the dock, and on the farm. Auto mechanics use it to drain fuel tanks before dropping them for pump replacement — clamp to the battery, insert the wand, and walk away while 15 gallons of gasoline transfer into a jerry can in under 10 minutes. Boat owners use the 24V mode on marine batteries to empty fuel/water separators and transfer diesel between saddle tanks. Small-engine technicians drain stale fuel from lawn mowers, generators, and snowblowers without tipping heavy equipment. Farmers transfer diesel from bulk storage to tractor tanks without a hand-cranked rotary pump that seizes every winter. The inline mesh filter catches rust flakes and sediment that would otherwise clog a carburetor — a detail that saves you from diagnosing a "bad fuel" problem that was actually a dirty transfer.
Frequently Asked Questions
Q: Will gasoline damage the pump over time?
A: No. The impeller is PTFE (polytetrafluoroethylene) — the same material used in fuel system seals and gaskets throughout the automotive industry. It is chemically inert to gasoline, ethanol, diesel, and most solvents. The pump housing is glass-filled nylon rated for continuous fuel contact. Flush with a cup of fresh fuel after use to clear the lines.
Q: How fast will it drain a motorcycle gas tank?
A: A typical 4-gallon (15L) motorcycle tank drains in approximately 4-5 minutes at the governed gasoline flow rate. The auto-shutoff sensor stops the pump when the tank is empty, so you don't need to monitor it continuously.
Q: Can it pump thick, cold engine oil?
A: Yes, but flow rate decreases with viscosity. Warm engine oil (180°F+) flows at ~3 L/min. Cold 15W-40 at 40°F flows closer to 1 L/min — still functional, just slower. For cold-weather oil changes, run the engine for 5 minutes first to warm the oil and improve flow.
Q: Does it work with 24V heavy truck batteries?
A: Yes. The pump auto-detects input voltage and adjusts motor speed accordingly. At 24V it draws approximately 3A — well within the capability of any truck battery. The 24V mode is particularly useful for marine applications and commercial fleet maintenance.
Q: What if I accidentally run it dry?
A: The air-detection sensor in the intake wand cuts power within 2 seconds of air ingestion. The pump will not restart until the wand is re-submerged in fluid. This prevents the PTFE impeller from spinning dry against the housing, which is the #1 failure mode of transfer pumps. If the sensor triggers, simply reinsert the wand and cycle power off/on.











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