UP3/OIL 16402012
Review how the Marco UP3/OIL Oil Transfer Pump connects, how it operates and which installation requirements apply to this model.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
Published plot gives a condition-specific current estimate; oil viscosity, temperature and pressure change demand, with no declared startup/maximum current.
Published plot gives a condition-specific current estimate; oil viscosity, temperature and pressure change demand, with no declared startup/maximum current.
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
4.5 A is an approximate 25°C graph point, not maximum or startup draw. Check the actual oil/pressure duty; 7.5 A fuse and short-run minimum 1.5 mm². Manufacturer installation manual
Edit this connection overviewInstallation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. Rev 09, December 1 2022), checked 2026-10-01. Manufacturer documentation →
UP3/OIL 16402012 is the 12 V oil-transfer model, not the water or reversible-control variant. The manual allows oils within its viscosity and temperature limits, including a maximum viscosity of 350 cSt and oil temperature of 85°C. It prohibits water and gasoline. Check the particular fluid’s compatibility and fire characteristics before use; similar hose connections do not make this a bilge, drinking-water or petrol pump.
The manual’s 12 V oil performance graph shows approximately 4.5 A at 25°C and 3.5 A at 45°C. This entry uses 4.5 A only as that graph’s nominal planning point; colder or more viscous oil and different backpressure can increase demand. No startup maximum is published. Use the specified 7.5 A fuse, positive red and negative black. For the manual’s up-to-2-metre short-wire case use at least 1.5 mm²; the example limits each leg to 0.75 m, and longer routes require a separate calculation.
Install secure compatible hoses, respect the flow arrow and prevent air leaks at the suction fittings. Use the recommended inlet filtration and an adequately vented source/receiving tank. Keep the outlet from becoming unintentionally blocked; do not assume an electrical fuse regulates delivery pressure. Mount the motor in a protected ventilated location. The manual prohibits PWM control because of its electrical filtering arrangement; use a suitable conventional switch instead.
Prime and test with the actual oil temperature and route, checking flow, leakage, loaded voltage and current. Continuous operation is conditional: the manual limits it to pressure no greater than half the pump’s declared maximum while motor temperature remains within its stated 60–70°C range. A short transfer of warm oil does not prove continuous cold-oil capability. Stop if the motor becomes excessively hot, flow collapses or current rises unexpectedly, and isolate power before clearing a restriction.
Marco installation manual, Rev 09, December 1 2022; English pp. 7–11 installation, prohibited fluids and fuse/wire table; p. 14 visually checked performance graphs; manufacturer-authored mirror. The original PDF is retained in the marine source ledger. This page uses an overview because the published operating estimate does not establish peak current for a complete cable-sizing example. The drawing represents the identified electrical interfaces; it does not simulate the equipment’s mechanical performance, radio signals or fluid system. Unpublished connector ampacity and startup current remain unspecified.
Build it out
Add UP3/OIL 16402012 to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
Red +
pos
positive · input
Black −
neg
negative · input
A dash means a current rating is not specified here.
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.