Denso 294180-0080 Gear / Rotor Set – The Small Part That Keeps HP3 & HP4 Pumps Alive

In any common rail system built around Denso HP3 or HP4 fuel pumps, one compact component quietly decides whether fuel delivery is smooth or problematic: the internal gear / rotor set. The 294180-0080 oil transfer pump gear is that component – a precision-machined gear set that drives the low-pressure (feed) stage of the pump, ensuring a stable fuel supply before it is boosted to high rail pressure. It is widely used in Isuzu, Toyota, Hyundai, Mazda and Nissan applications that rely on Denso HP3/HP4 technology.

 

 

Most buyers don't search for "small gear in HP3 pump" – they type a part number. Common references associated with this gear set include:

Denso / OEM: 294180-0080, 2941800080, listed as rotor set, gear pump or transfer pump gear slturbo 

Descriptions: fuel pump rotor, feed pump rotor set, oil transfer pump gear, rotor set feed pump – Denso HP3  

Cross references in some listings: matched with Denso pump assemblies in the 294000-**** range, and with Toyota pump references such as 22100-0L060 / 22100-30021 for 2KD-FTV engines 

On a Google independent site, placing these part numbers and naming variants near the top of the page helps capture searches like "294180-0080 Denso rotor set", "HP3 feed pump gear 2941800080" or "2KD-FTV pump gear 22100-0L060". 

 

 

The 294180-0080 gear is not a universal gear; it is designed specifically as the feed/transfer gear set inside Denso HP3/HP4 fuel pumps:

HP3 / HP4 common rail pumps used on a wide range of diesel passenger and light commercial vehicles  

Isuzu HP4 applications, where it is sold as a genuine Isuzu gear set 294180-0080 aspect-plus.com

Toyota 2KD-FTV diesel pumps (e.g. Hilux / Hiace markets) via OE pump gear references 22100-0L060, 2210030021, 22100-30021  

Widely promoted as compatible with HP3/HP4 pumps used in Hyundai, Isuzu, Mazda and Nissan vehicles using Denso common rail systems 

Many wholesalers list 294180-0080 as a universal internal gear set for Denso HP3/HP4 transfer pumps, which makes it attractive stock for workshops that rebuild pumps across multiple brands.

 

 

Inside an HP3 or HP4 pump, the high-pressure plungers cannot work properly unless the low-pressure stage first pulls fuel from the tank and pushes it into the main pumping chambers. The 294180-0080 transfer pump gear is the heart of this low-pressure stage.

Key functions and characteristics:

Draws fuel from the supply line and feeds it to the high-pressure section of the pump at a consistent pre-pressure

Uses a matched rotor and gear design to minimise pulsation and noise during operation  

Typically manufactured in hardened steel for long life in high-rpm, high-temperature diesel environments  

Compact and light – some aftermarket listings quote a net weight of around 0.1 kg per set, supplied individually packed for workshop use  

When this small gear wears out, the pump may still turn, but fuel supply becomes uneven, which can lead to low-rail-pressure faults, hard starting or poor performance.

 

 

Workshops and diesel specialists usually look at the feed pump gear after seeing issues such as:

Low rail pressure at cranking or under load, even with apparently healthy injectors

Extended cranking time, especially on hot restarts

Intermittent power loss at higher rpm

Metal particles or abnormal wear signs when the HP3/HP4 pump is opened for inspection

Many rebuilders prefer to replace the 294180-0080 gear set proactively whenever an HP3 or HP4 pump is overhauled, as it is a low-cost way to restore transfer pump efficiency and avoid repeat failures.

 

 

Positioning this gear as a specialist, high-value small part can differentiate your catalogue from generic marketplaces:

It's a high-turnover item for pump rebuilders working on Denso HP3/HP4 units across Toyota, Isuzu, Hyundai, Mazda and Nissan platforms.  

Buyers specifically search "294180-0080 pump gear", "HP3 feed pump rotor set 294180-0080" or "Denso transfer pump gear", so optimising around these phrases brings in ready-to-buy traffic. 

Many listings emphasise benefits like brand-new condition, 1-year warranty and quick global delivery, which you can mirror to match customer expectations for professional-grade parts.  

By combining part numbers, pump types (HP3/HP4), engine codes (2KD-FTV, Isuzu HP4) and real workshop symptoms, your product page will read as both SEO-friendly and technically credible.

 

 

 

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