S-901 Oil Transfer Pump
The STAR S-901 Oil Transfer Pump is a manual dual-direction fluid transfer pump built with a full steel body for workshop and industrial fluid handling. It draws in and pumps out liquid in a single plunger stroke, making it safe and efficient for transferring oils, coolants and other fluids without direct body contact.
The plunger-type mechanism operates in both directions: push to dispense, pull to extract. This eliminates the need for separate suction and dispensing tools, reducing equipment costs and simplifying fluid transfer between containers, engines and reservoirs.
With 500 ml (16 oz.) barrel capacity and 8 feet of vinyl hose split across two valves, the S-901 reaches into engine bays, gearboxes and storage drums without repositioning. The plated steel head and NBR seals handle fuel oils, mineral oils, synthetic oils, cooling liquids and spirits.
We at STAR manufacture this transfer pump for automotive workshops, marine maintenance crews, fleet service depots and industrial facilities that need a rugged, chemical-resistant hand pump for daily fluid transfer tasks. 40+ years of manufacturing experience, serving customers across multiple continents with OEM and private label options available.
Rugged Build Quality
- Full steel body: drop-resistant barrel withstands workshop handling and tool box storage without cracking or deforming.
- Plated steel head: corrosion-resistant plating protects against oil, coolant and moisture exposure over years of service.
- Delta type plunger handle: drop-resistant triangular grip provides secure two-finger operation even with oily hands.
- NBR (nitrile rubber) seals: chemical-resistant seals compatible with petroleum-based fluids, synthetic oils, coolants and spirits.
- 8 ft vinyl hose (2 x 4 ft): flexible PVC hose on both inlet and outlet valves for reach into deep sumps and between containers.
- Dual-direction operation: single plunger stroke draws in or pumps out fluid, eliminating the need for separate extraction and dispensing tools.
- 500 ml (16 oz.) capacity: standard barrel size transfers meaningful fluid volume per cycle without excessive weight when full.
- 57.15 mm barrel diameter: standard 2-1/4" bore provides consistent plunger seal contact and smooth operation across the full stroke.
How the S-901 Works
The S-901 uses a simple plunger mechanism that moves fluid in both directions depending on stroke direction:
- Connect: Attach the inlet hose to the source container (engine sump, gearbox, drum) and the outlet hose to the destination container. Each hose is 4 ft (1.2 m) long, giving 8 ft total reach between source and destination.
- Extract: Pull the plunger handle upward. The plunger creates negative pressure inside the steel barrel, drawing fluid through the inlet valve and hose into the 500 ml chamber. One full stroke fills the barrel.
- Dispense: Push the plunger handle downward. Positive pressure forces the fluid out through the outlet valve and hose into the destination container. The non-return valves ensure fluid flows in one direction only per stroke.
No priming is required. The pump is ready to use immediately after connecting hoses. For viscous fluids like gear oil, warm the fluid first to reduce resistance and improve flow rate.
| Parameter | Value |
|---|---|
| Model | S-901 |
| Type | Manual Dual-Direction Oil Transfer Pump |
| Mechanism | Plunger Type (Hand Operated, Dual Direction) |
| Capacity | 500 ml (16 oz.) |
| Barrel Diameter (Ø) | 57.15 mm / 2-1/4" |
| Barrel Material | Steel (Full Steel Body) |
| Head Material | Plated Steel |
| Handle Type | Delta Type Drop-Resistant Plunger Handle |
| Hose Length | 8 ft total (2 x 4 ft / 2 x 1.2 m) |
| Hose Material | PVC (Vinyl) |
| Wetted Components | Steel, PVC, NBR |
| Seal Material | NBR (Nitrile Rubber) |
| Recommended Fluids | Fuel Oils, Mineral Oils, Synthetic & Biological Oils, Cooling Liquids & Spirits |
| Not Recommended For | Gasoline, Acetone, MEK, Strong Solvents, Corrosive Chemicals |
| Operating Temperature | -10°C to +60°C |
| Country of Origin | India (Made in Ludhiana) |
| Certifications | ISO 9001:2015, CE, RoHS compliant |
| HS Code | 8413 |
| Warranty | 1 year against manufacturing defects |
| OEM / Private Label | Available (MOQ applies) |
Every S-901 ships complete with hoses attached and ready to use. No assembly required beyond connecting to your fluid source and destination.
4 ft (1.2 m) Inlet Vinyl Hose
4 ft (1.2 m) Outlet Vinyl Hose
Instruction Manual
Every kit is fully customisable. Alternative hose lengths, materials, or fittings can be specified for OEM orders.
Contact us for custom kit configurations.
Understanding the S-901's construction and design choices helps you select the right transfer pump for your application:
The S-901 handles fluid transfer across any environment where manual, portable operation is preferred over electric or pneumatic pumps:
S-901 Related Models
Oil Transfer Pump S-902 Aluminium Die Cast Head
500 ml (16 oz.)
Aluminium Die Cast Head
Oil Transfer Pump S-902CL Clear Tube
500 ml (16 oz.)
Clear Tube (Visible Fluid Level)
Oil Transfer Pump S-903 Plastic Transparent Barrel
500 ml (16 oz.)
Plastic Body (Corrosion Free)
Related Product Categories
Buying Guide: When to Choose the S-901
Selecting the right transfer pump depends on your fluid type, working environment and durability requirements. Here is how the S-901 compares to alternatives in the STAR range:
S-901 vs S-902 (Aluminium Die Cast Head)
Both share the same 500 ml capacity and 8 ft hose configuration. The S-901 uses a plated steel head for maximum drop resistance and durability in heavy workshop use. The S-902 substitutes an aluminium die cast head, which reduces weight for extended overhead or awkward-angle transfers. Choose the S-901 for tool box environments where drops are common; choose the S-902 when lighter handling matters more than impact resistance.
S-901 vs S-903 (Plastic Transparent Barrel)
The S-903 uses a transparent plastic barrel that lets you see the fluid level and colour during transfer. This is useful for contamination checks and measuring transferred volume visually. However, plastic barrels are less impact-resistant and can degrade under UV exposure. Choose the S-901 when durability is the priority; choose the S-903 when visual fluid monitoring matters.
S-901 vs Electric Transfer Pumps
Electric pumps transfer fluid faster but require power, cost significantly more, and introduce failure points (motors, wiring, batteries). The S-901 operates anywhere without electricity, has no motor to burn out, and costs a fraction of electric alternatives. For occasional transfers (weekly oil changes, monthly coolant top-ups), manual operation is faster when you factor in setup and cleanup time. Electric pumps justify their cost only for high-volume continuous transfers exceeding 20 litres per session.
S-901 vs Siphon Pumps
Siphon pumps rely on gravity and only work when the source is higher than the destination. The S-901's plunger mechanism generates positive pressure, transferring fluid in any direction regardless of container height. This makes it effective for bench-to-floor, floor-to-bench, and same-level transfers that siphons cannot handle.
OEM and Bulk Buyers
For distributors, importers and OEM partners, the S-901 offers a proven steel-body platform with custom branding, packaging and hose length options. We at STAR provide private label manufacturing with flexible MOQs and FOB pricing. Contact our export team for partnership details.
Frequently Asked Questions: Oil Transfer Pump
What is an oil transfer pump and how does it work?
An oil transfer pump is a hand-operated plunger device that moves fluid between containers by creating alternating positive and negative pressure inside a sealed barrel. The S-901 works in dual direction: pulling the plunger draws fluid in through the inlet hose, pushing it forces fluid out through the outlet hose. Non-return valves on each port prevent backflow. Unlike siphon pumps that rely on gravity, the S-901 transfers fluid regardless of container height, making it effective for bench-to-floor, floor-to-bench and same-level transfers. The 500 ml (16 oz.) steel barrel fills in one full plunger stroke.
What is a dual-direction transfer pump?
A dual-direction transfer pump both extracts and dispenses fluid using the same tool, compared to single-direction suction guns that only pull fluid out. The S-901 has two hose ports with non-return valves: one inlet and one outlet. Pull the plunger to extract; push to dispense. This means you can draw oil from an engine sump and pump it directly into a waste container without pouring, tilting or using a second tool. Single-direction suction guns (like the STAR S-905 series) require you to empty the barrel manually between extractions.
How much fluid does the S-901 transfer per stroke?
The S-901 transfers up to 500 ml (16 oz.) per full plunger stroke, depending on fluid viscosity and hose length. Thin fluids like engine oil at operating temperature fill the barrel completely in one stroke. Thicker fluids like cold gear oil (SAE 75W-90) may require 2-3 partial strokes to fill the barrel. For a typical 4-litre engine oil change, expect 8-10 full pump cycles to transfer the complete volume. The consistent barrel capacity makes it easy to measure transferred volume by counting strokes.
What fluids can I transfer with the S-901?
The S-901 safely handles fuel oils, mineral oils, synthetic oils, biological oils, cooling liquids, transmission fluid, gear oil, hydraulic oil and spirits. The NBR (nitrile rubber) seals and PVC hoses are chemically compatible with all petroleum-based fluids and most water-based coolants. Do not use with gasoline, acetone, MEK, strong solvents or corrosive chemicals, as these degrade NBR seals and PVC hoses. For brake fluid (DOT 3/4), short-term use is acceptable but prolonged exposure can swell NBR seals over time.
Can I use the S-901 for gear oil and transmission fluid?
Yes, the S-901 handles gear oil (SAE 75W-90, 80W-140) and automatic transmission fluid (ATF) without any modification. For thick gear oils, warm the vehicle or equipment first to reduce viscosity and improve flow rate through the 4 ft hose. Cold gear oil is significantly more viscous than engine oil and requires more effort per stroke. The 57.15 mm barrel diameter provides enough plunger surface area to generate sufficient suction even with heavier fluids. ATF flows easily at any temperature due to its lower viscosity.
Can I use this pump for marine engine and lower unit service?
Yes, the S-901 is widely used for marine lower unit gear oil extraction, outboard engine oil changes and boat winterising fluid transfer. The 4 ft inlet hose reaches into lower unit drain/fill ports on most outboard and sterndrive configurations. The plated steel head resists corrosion from salt air and moisture exposure common in marine environments. For boat winterising, use the pump to extract coolant and replace with antifreeze through the same hose connections without removing engine covers.
Can I use the S-901 for coolant and antifreeze?
Yes, the NBR seals and PVC hoses are fully compatible with ethylene glycol and propylene glycol coolants, including pre-mixed antifreeze solutions. The S-901 transfers coolant between radiators, overflow tanks, storage containers and waste drums. After transferring coolant, flush the pump with clean water before switching to oil-based fluids to prevent cross-contamination. The dual-direction operation makes coolant system bleeding easier: extract air-trapped coolant from the high point and pump fresh coolant in from below.
Does the S-901 come with both inlet and outlet hoses?
Yes, every S-901 ships with two 4 ft (1.2 m) vinyl hoses pre-attached to the inlet and outlet valves, giving 8 ft total working reach. Both hoses are identical PVC vinyl construction. The inlet hose connects to the bottom valve (extraction side) and the outlet hose connects to the top valve (dispensing side). No additional hoses or fittings are required for standard operation. For OEM orders, alternative hose lengths and materials can be specified.
How do I fix air lock in my transfer pump?
Air lock occurs when air enters the barrel and prevents the plunger from creating sufficient vacuum to draw fluid. To fix: submerge the inlet hose tip fully in the source fluid (air enters when the hose tip is above fluid level). Then pump the plunger slowly through 3-5 full strokes. The air will purge through the outlet hose. If air lock persists, check the hose connections for loose fittings, inspect the NBR plunger seal for wear or damage, and ensure the non-return valves are not blocked by debris. A worn plunger seal is the most common cause of persistent air lock on older pumps.
Why is my transfer pump not pumping fluid?
The most common causes are air lock, a worn plunger seal, a blocked hose, or a stuck non-return valve. Troubleshoot in order: first, ensure the inlet hose is submerged in fluid (not drawing air). Second, check for kinks or blockages in either hose. Third, inspect the plunger seal for cracks or hardening; a worn NBR seal cannot create the vacuum needed to draw fluid. Fourth, check that both non-return valves move freely and are not clogged with debris or dried fluid. If the plunger moves freely but no fluid transfers, the seal needs replacement.
How do I maintain and clean my oil transfer pump?
After each use, pump clean solvent or kerosene through the barrel and hoses to flush residual fluid, then pump air through to dry the internals. Never leave used oil sitting in the barrel for extended periods as it can degrade the NBR seals and leave deposits that reduce plunger seal effectiveness. When switching between different fluid types (oil to coolant, for example), flush thoroughly to prevent cross-contamination. Inspect the plunger seal every 6 months for hardening or cracking. Wipe the exterior with a clean rag and store with the barrel empty.
How do I store my oil transfer pump to prevent seal damage?
Store the S-901 with the barrel empty, hoses detached or coiled loosely, in a clean dry area between 5°C and 35°C. Avoid direct sunlight on the vinyl hoses as UV exposure degrades PVC over time, causing cracking and stiffness. Do not store with fluid in the barrel; residual oil can polymerise and bond the plunger seal to the barrel wall after months of inactivity. If storing for more than 3 months, apply a thin film of light oil to the plunger rod to prevent surface corrosion. Keep away from solvents, which can damage NBR seals through vapour exposure.
Is the steel body rust resistant?
The S-901's steel barrel has a protective finish that resists surface corrosion under normal workshop conditions. The plated steel head provides additional corrosion resistance from its chrome-style plating. However, prolonged exposure to water, salt spray or acidic fluids without cleaning can eventually cause surface rust on unplated areas. Wipe the exterior dry after use in wet environments. For marine or coastal workshops where salt air is constant, consider the S-903 plastic body which is completely corrosion-free.
What safety precautions apply when using an oil transfer pump?
Wear nitrile gloves and safety glasses when transferring any fluid to prevent skin contact and splashing. Never use the S-901 for gasoline or volatile solvents as these create fire and explosion hazards with static discharge. Work in ventilated areas when transferring fluids that produce fumes. Dispose of waste fluids according to local environmental regulations; never pour used oil into drains or soil. If fluid contacts skin, wash immediately with soap and water. Keep the pump away from ignition sources when transferring any petroleum-based fluid.
Why Global Buyers Trust STAR
We at STAR have been manufacturing oil transfer pumps and fluid handling equipment in our ISO 9001:2015 certified Ludhiana facility since 1980. As a dedicated manufacturer and wholesale supplier, our products are shipped internationally across Europe, Asia, Africa and the Americas with full export documentation and dedicated OEM support.