Bennett U102-A Vane Pump

U102-A Sliding-Vane Fuel Pump with Vortex Air Eliminator — Bennett T-75 Equivalent

The U102-A is a positive-displacement sliding-vane fuel pump with an integrated vortex-style air separator, designed as a direct mechanical replacement for the Bennett T-75 pumping unit in any T-75-platform fuel dispenser. Bennett's T-75 has been the dominant OEM hydraulic for retail and commercial fuel dispensers worldwide for over four decades — the company itself documents that more than 30 third-party dispenser brands are built on its hydraulics. The U102-A drops in to all of them, including Gerkon dispensers (every model), Bennett-platform Asian dispensers (Censtar, Tatsuno-clones, and many others), and as a service replacement on legacy Bennett retail dispensers in markets where original Bennett spares are slow or expensive to obtain.

What sliding-vane pumping actually does

Inside the U102-A's aluminium housing a cast-iron rotor with eight radial slots spins inside an eccentrically-bored cast-iron stator. Eight carbon-graphite vanes ride in those slots and are pushed outward against the stator wall by centrifugal force as the rotor turns. Where the rotor sits closer to one wall of the stator, the chambers between vanes shrink (delivering fuel under pressure); on the opposite side they grow (creating the suction lift that pulls fuel up from the underground tank). The rotor shaft is chrome-plated steel running on self-lubricating PTFE bearings — no oil bath, no scheduled greasing, no contamination of the fuel stream.

This is the operating principle Bennett patented in the 1950s, refined for petroleum service since, and copied by every credible fuel-pump manufacturer in the world. It works because:

• Volumetric delivery is independent of head pressure — the meter downstream sees a constant flow regardless of whether the dispenser is fuelling a car next to it or a truck 50 m away with a long hose
• Self-priming — the pump can lift fuel from a tank up to 5 m below the pump centreline, even from a dry start
• Tolerates entrained air — the air separator (see below) handles the bubbles that inevitably appear during low-tank events without damaging the vanes
• Low pulsation — eight vanes in a 360° rotation means a new chamber discharges every 45° of rotation, giving smooth flow and accurate metering downstream

The vortex air eliminator — why it matters

Every fuel-station operator hates "fuel meter creep" — the slow ticking-up of the dispenser counter when no fuel is actually being delivered, caused by air or vapour in the line being measured as liquid. The U102-A solves this with a built-in vortex separator chamber downstream of the pump body and upstream of the meter. Mixed gas-liquid flow enters tangentially, spins, and centrifugal separation drops the heavier liquid to the bottom outlet (which feeds the meter) while lighter air and gasoline vapour rise and exit through a small float-controlled vent that returns them to the underground tank.

This design eliminates ≥20% air content from the fuel stream, which is the OIML R117 requirement for legal-trade dispensers. It's the same air-elimination principle Bennett brand-names "vortex air eliminator" — and the U102-A reproduces it dimensionally so it bolts straight into the same mounting points and uses the same vent return line as the original T-75.

Specifications

• Pump type: sliding-vane positive displacement, 8 carbon-graphite vanes, cast-iron rotor/stator
• Equivalent to: Bennett T-75 Standard (supports up to E15 / B7 fuel blends)
• Flow rate: 40-60 L/min (10.5-15.8 US gpm) at 520 rpm; configurable to 80 L/min at 700 rpm with appropriate motor sizing
• Working pressure: 0.3 MPa (3 bar / ≈45 psi) sustained, 0.5 MPa peak; bypass valve set to relieve at 50 psi
• Suction lift: up to 5 m vertical (vacuum 0.054 MPa)
• Air separation: built-in vortex chamber, ≥20% air removal per OIML R117
• Strainer: 70 µm integral mesh, removable for cleaning
• Drive: belt-driven from external 0.55-0.75 kW (¾ HP) electric motor; standard pulley sizing for 1450 rpm 50 Hz motors
• Body and components: aluminium pump body, cast-iron rotor and stator, carbon vanes, chrome-plated steel shaft, PTFE bearings, NBR primary seals
• Compatible fuels: gasoline (RON 80-98), diesel EN 590, kerosene, jet fuel, biofuel blends up to B7 / E15
• NOT compatible with: LPG / autogas (separate high-pressure pump required), heavy fuel oil, lubricants above 100 cSt
• Operating temperature: −30 °C to +60 °C ambient; fuel temperature −20 °C to +50 °C
• Noise level: ≤68 dB(A) at 1 m, normal operating speed
• Dimensions: 355 × 270 × 330 mm
• Weight: 17.5 kg dry
• Certification: compliance to OIML R117 (the international metrology standard for dynamic fuel measuring systems); type-tested by UkrMetrTestStandard

U102-A vs. genuine Bennett T-75 — what's the same and what's different

Mechanically: identical mounting points, identical pulley spacing, identical vent and inlet/outlet locations. A T-75 can be unbolted and a U102-A bolted in its place without modifying the dispenser frame, electrical harness, or hydraulic plumbing. This is what makes the part a true OEM-equivalent rather than just "a similar pump."

Sourcing-wise: a genuine Bennett T-75 from authorised distributors in Europe runs €450-700 plus 4-8 weeks lead time for non-urgent orders, longer for urgent ones because Bennett ships only from US warehouses for non-Bennett-branded dispensers. The U102-A is in stock at our Zaporizhzhia warehouse — typical dispatch same day or next working day, with EU delivery via DHL or DSV in 4-7 days. For a fleet of dispensers requiring spares standardisation, this lead-time difference alone is usually decisive.

Quality: we manufacture U102-A in collaboration with the same Asian foundries that supply OEM Bennett-platform pumps to several other dispenser brands. Components are tested to the same UL/OIML criteria; we provide our own test certificate with each unit, plus a longer warranty than typical for after-market parts.

When to replace

• Flow-rate decay — fuelling now slower than commissioning baseline; usually worn vanes losing seal against the stator wall
• Audible vane chatter / cavitation — bearings worn or vanes chipped; pump still pumps but should be replaced before catastrophic failure
• Strainer pressure-drop — meter velocity slowing, suction-side gauge showing increased vacuum: typically the strainer is fouled and needs cleaning, but if the pump body itself is suspect, replace it during the same maintenance window
• Seal weeps — fuel visible on the dispenser drip tray under the pump area; the shaft seal has lost compression, time for a rebuild or full replacement
• Cold-start failure — pump trips the motor breaker on cold mornings; vanes have stuck in their slots due to gum/varnish build-up from old fuel
• Scheduled overhaul — most fuel-station operators replace the pump every 7-10 years as preventive maintenance, regardless of failure mode; a €250 pump is far cheaper than 3-4 days of dispenser downtime

Warranty, sourcing, export

12-month manufacturer warranty covering manufacturing defects, premature wear and seal failures under normal operating conditions. Extended warranty (24 months) available for fleet customers with documented preventive maintenance schedules.

U102-A ships from Zaporizhzhia, Ukraine via Nova Poshta or SAT within Ukraine (1-3 days), or DHL / DSV / nominated EU forwarder for European customers (4-7 days transit). Standard incoterm EXW Zaporizhzhia; DAP shipping with EUR.1 movement certificate and CMR documentation prepared on request. Distributor pricing for batch orders — contact our export desk via the form on this page or at gerkon1948@gmail.com.