UnLucky supports product selection, supply requests, installation and diagnostics for Marco pumps based on fluid, required flow and pressure, voltage, suction lift, duty and existing pipework. This page focuses on water systems, bilge and transfer pumps, plus oil pumps and oil-change systems.
Categories and applications are aligned with the official Marco catalogue. We do not assume compatibility, permitted fluid, continuous duty or dry-running capability; these are confirmed from the exact model datasheet.
Pumps in a real onboard system
Required flow at the outlet is often lower than catalogue free-flow. Suction lift, hose length and diameter, filters, valves, pressure and viscosity change the pump duty point. We therefore connect every recommendation to the installation.
Fresh water, waste water, sea water and oil do not automatically use the same pump or seal materials.
For taps, showers and other outlets, pressure and flow are matched to simultaneous use and existing pipework.
Impeller and other transfer pumps can move water, support washdown or drainage when materials and duty are compatible.
A submersible pump is part of a safety system including a float or sensor, alarm, suitable non-return arrangement and reliable power.
Gear and dedicated impeller pumps handle lubricating oils only within the exact model’s viscosity, temperature and duty limits.
For multiple engines, a generator or transmissions, a valved manifold with controlled direction can be planned and every circuit labelled.
A pump that pulses, will not build pressure, overheats or trips a fuse may have an installation problem rather than a failed pump motor.
Official Marco pump categories
The official catalogue covers several technologies and many versions. Here they are organised by onboard function rather than as an unfiltered model list.
Exact voltage, ports, materials, protection, duty cycle and performance curve are checked for the selected model.
Self-priming versions with electronic control adapt operation to demand and can reduce cycling when correctly sized and installed.
Official category example: UP/E water-pressure systems.They transfer compatible fluids, while impeller and seal material depend on water or oil, temperature and intended duty.
The Marco catalogue separates water and oil versions.Official self-priming gear pumps cover transfer of lubricating oils and more viscous fluids within each model’s limits.
Current line example: UP/OIL.Vane pumps provide a different performance profile and construction. Application, fluid and protection are confirmed from official technical documentation.
Not every pump is intended for the same fluid or duty.Compact 12/24 V versions form part of the bilge system. Actual flow depends on discharge head, hose, valves and power supply.
Automatic operation and alarm require a separate plan.The Marco catalogue includes dedicated controlled oil-change systems with valves. Configuration is selected by circuit count and installation.
The goal is a clean, controlled and clearly labelled change.Before selecting a model
A useful request states what is being pumped, from where to where, how often, at what voltage and with which existing pipework and protection. A photo of the old pump helps, but is not enough to guarantee a compatible replacement.
Prepare system detailsUnLucky integration process
Selection covers both hydraulics and electrics: pipework, valves and suction, plus cable size, fuse, switch, relay or electronic controller.
For safety-critical functions such as bilge pumping, the system and redundancy are planned, not just one pump.
We establish fluid, direction, duty, flow or pressure and how critical the function is onboard.
We measure or confirm pipework, lift, voltage, cable, fuse, control, ventilation and service space.
We propose a model or shortlist only after checking official performance, materials and compatibility.
After installation we check leaks, loaded voltage, current, pressure or flow, automatic control and noise.
Precise status wording
This page does not claim that UnLucky is an authorised Marco distributor or service centre because no publicly verifiable evidence was established. It clearly offers what can be documented: technical selection, supply request, installation, electrical-hydraulic checks and onboard diagnostics.
Frequently asked questions
These answers cover common selection mistakes. Exact compatibility is confirmed from the selected model datasheet and installation condition.
Do not assume so. Gear or impeller material, seals, viscosity, temperature and intended use vary by model. The official catalogue has separate water and oil versions; compatibility is confirmed from the datasheet.
We count outlets that may run together, verify permitted pressure for taps, calorifier, filters and hoses, then account for lift and losses. Maximum free flow is not the same as delivered flow at a distant pressurised shower.
It depends on technology and exact model. Self-priming does not automatically mean continuous dry-running capability. Dry operation can damage an impeller, seal or pump, so the limit is always checked in official documentation.
Possible causes include an undersized or incorrectly set accumulator, leak, suction air, restriction, mismatched pressure, faulty pressure switch or a pump oversized for the system. It needs measurement, not guesswork.
A suitable solution can often be found, but replacement is not automatically plug-and-play. Fluid, flow/pressure curve, voltage and current, ports, dimensions, control, protection and duty cycle are compared.
Send pump function, fluid, voltage, target flow or pressure, vertical lift, hose length and diameter, control method, old-pump and plate photos, and vessel location. For oil, include type and approximate pumping temperature.
Marco pumps • technical request
For a replacement, send photos of the plate, ports, hoses, fuse and mounting space. For a new system, state target flow or number of outlets, vertical lift and pipe run length.
