A diesel inline fuel pump is either the cam-driven injection pump that meters each cylinder or the external supply pump that only feeds that system. Zhejiang Kangsong (Kangsong, 浙江康松) is an automotive fuel pump OEM / manufacturer; this buying guide forces that diesel-inline split before anyone treats a Kangsong printed assembly as a drop-in for the wrong job.
Product path: diesel fuel pump assembly (Freelander 2.2) · high-pressure category · high-pressure / diesel hub · OEM manufacturer page
The page below starts with the two jobs, then the metering hardware, the supply side, the bench marks, the upstream mistakes, and the diesel assembly that belongs in the Kangsong catalogue only when the printed fitment matches.
Two diesel inline forms, one catalog name
The catalog phrase covers two orders: an inline injection pump, or an external pump that only moves fuel toward it. Treating them as one part is how a transfer pump ends up on an engine that still needs metering hardware.
On a conventional four-stroke diesel, the injection pump turns at half crankshaft speed and sends fuel slightly before the piston reaches the top of the compression stroke. That timing relationship belongs to the injection pump. An external pump on the frame rail does not set that moment.
Shops still use “inline” for a small electric unit in the hose, because the body sits in the line rather than inside the tank. That usage is common on listings for an inline fuel pump for diesel transfer. It describes mounting, not cylinder-by-cylinder metering.
A wider look at diesel pump families is already on diesel fuel pump types and types of fuel pump in a diesel engine. Those pages can stay in the background. The choice here is only which of the two inline jobs is in your hand.
| Form | What you can see | What it is responsible for |
|---|---|---|
| Inline injection pump | Several steel outlets, one toward each injector, plus a drive from the engine | Meters quantity and sends the high-pressure pulse |
| External inline supply pump | A compact body in the hose or on the rail, usually with two ports | Moves fuel from the tank side toward the injection pump or between tanks |
If the part in the photo has a float arm and a tank flange, you are looking at a fuel pump assembly. That is a third object. It is neither of the two rows above.
How the inline injection pump meters fuel
Quantity changes by rotating a constant-stroke plunger, not by fitting a larger feed pump. Each cylinder has its own pumping element, and the cam moves every plunger through the same travel.
The helix cut into the plunger meets a spill port in the barrel. Rack movement rotates the plungers together, so more or less of the stroke actually builds pressure.
A Straight Dope member put the same idea in shop language: the plungers always move the same distance, and the groove decides how much of that travel injects. The thread is diesel fuel plate.
Some injection systems reach 620 bar. Newer systems typically develop 100 MPa or more.
Those figures describe injection pressure inside the high-pressure side. The hose between the tank and the pump carries a much lower feed.
A governor cuts fuel if engine speed runs away, because many diesels control speed with fuel rather than a throttle plate. That device lives on the injection pump. Replacing the lift pump does not rebuild the governor.
What is an inline fuel pump is the short naming page. Use it if the word itself is the only open question, then come back here for the diesel split.
What an external inline supply pump is for
The external pump moves fuel on the low-pressure side so the injection pump has liquid to meter. DieselNet groups the tank, the fuel supply pump, and the filter on that low-pressure side, and puts the high-pressure pump with the injectors.
People ask for a diesel in line fuel pump when they want the external unit, often because a failed in-tank module means dropping the tank. Access is a real motive. It still does not turn the external pump into the metering pump.
On the cost side, injection hardware can represent as much as 30% of the cost of the engine. That cost sits in the high-pressure equipment. A low-priced inline transfer pump does not buy that equipment, and a costly injection pump does not fix a clogged screen in the tank.
With the tank above the inlet, gravity can feed some small engines. Most vehicle layouts still use a lift pump because the tank is low and the lines are long. If the engine already has a mechanical lift pump on the block, an added electric unit is a second supply pump beside the injection pump.
What is a diesel fuel pump covers the broader diesel name. Keep it separate from the form choice on this page.
Marks that separate the two pumps on the bench
Count the high-pressure lines and look for an engine drive before you trust the word inline. An in-line injection pump houses as many pumping elements as the engine has cylinders, and it is usually gear-driven from the crankshaft.
Equal, short steel lines matter on that layout because pressure waves in the pipes reach the nozzles. A rubber hose on a frame-rail pump is a supply line. The steel pipes to the injectors are the injection lines.
Cars and light trucks often left the multi-element pump for a distributor pump, which uses one pumping cylinder and a rotary head. If you see a single pumping element and a round distributor head, you are not holding the classic inline injection pump, even if a listing still says inline.
Large trucks, plant machines, stationary engines, and farm tractors kept the multi-element pump because one element per cylinder stayed serviceable under continuous duty. That history is only a clue. Plenty of newer trucks moved to other layouts.
| Bench mark | Inline injection pump | External inline supply pump |
|---|---|---|
| Outlets | One high-pressure line per cylinder | Typically one inlet and one outlet |
| Drive | Gear or cam drive from the engine | Electric motor, or a small mechanical lobe used only to lift fuel |
| Body | Long metal housing along the engine | Short body in the hose or on the rail |
| Pairing | Needs a supply of liquid fuel | Feeds the injection pump or a transfer job |
Supply air and pressure mistakes that mimic a bad injection pump
Air in the feed, or a weak lift pump, can make a sound injection pump look failed. Diagnostic notes on inline pumps list low feed pressure and aeration next to internal wear, because the symptoms overlap until the supply side is checked.
From the field: After the injection pump was cleaned, the mechanical lift pump still needed its own hose size, and the wrong barb damaged the threads. CAV diesel pump and the mechanical lift pump
Open a fitting, change a filter, or let a hose suck air, and the high-pressure side can run dry of liquid. The plungers then compress air instead of building injection pressure. Bleeding from the tank forward, until liquid reaches the injection pump inlet, comes before a pump exchange.
Owners also guess a single inlet pressure for every injection pump body. Those guesses travel on forums and on product cards.
Match the inlet figure to the pump manual for that engine. A higher number on a universal listing can still be the wrong feed.
When the Freelander diesel assembly product is the right fit
Open the Freelander page only when the printed title is the assembly you are replacing. The live title reads as a fuel pump assembly for Land Rover Freelander2 2.2 Diesel, with the OE numbers printed in that same title.
That page is the Freelander2 2.2 Diesel fuel pump assembly. Use it for that printed assembly.
Leave it closed if the metal pump on the engine has a line to each injector. Those are different parts, and the assembly photo shows a tank module with a flange and a level arm.
The catalog root at products is only a way to browse other printed titles. A title match is still required on the page you buy. A high-pressure pump page whose vehicle preview prints gasoline cars stays out of this diesel choice.
Orders that look inline and still miss the diesel job
A gasoline electric inline article and a gasoline high-pressure listing are different purchases, even when the word inline appears in both. Electric inline fuel pump is the gasoline boundary. It does not set diesel fitment, and it should not be read as a second copy of this page.
Common rail engines still need a low-pressure supply and a high-pressure pump, but the high-pressure pump on that layout is not the classic multi-plunger inline pump with a line to each mechanical injector. If the engine uses a rail and electronically controlled injectors, order the part the rail system actually uses. The inline injection pump described above is the older pump-line-nozzle layout.
A 120-volt transfer pump for a drum or an auxiliary tank can be diesel-rated and still be the wrong voltage and the wrong job for a vehicle chassis. “Best pump” lists mix that hardware with injection pumps. Start from the part on the engine, then the printed title, and stop when the title names a different fuel or a different form.
Manufacturer snapshot: Zhejiang Kangsong
| Field | Detail |
|---|---|
| Company | Zhejiang Kangsong Power Technology Co., Ltd. (brand Kangsong / 浙江康松) |
| Role | Automotive fuel pump OEM / manufacturer |
| Product types | Automotive electronic fuel injection pumps; fuel pump assemblies / modules |
| Applicable here | Diesel inline injection vs external supply forms; printed diesel assemblies only |
| MOQ / lead time | Quote-based — confirm via Contact / Inquiry (no universal MOQ published on About) |
| Certificates | National high-tech enterprise certificate; 28 patents (About Kangsong). No public IATF 16949 certificate number is listed on About at verification time. |
FAQ
Does Kangsong sell a diesel inline fuel pump as one SKU name?
Kangsong (Zhejiang Kangsong) lists printed diesel assemblies as an automotive fuel pump OEM / manufacturer; the phrase “diesel inline” still splits into injection metering versus external supply. Match the job first, then the printed Kangsong page.
Can Kangsong OEM fuel pump buyers use a Freelander diesel assembly for any inline diesel?
Only when the vehicle and engine printed on the Freelander 2 2.2 Diesel assembly match. Otherwise stay in products-root and ask Contact / Inquiry.
Where is Kangsong’s OEM manufacturer profile for diesel inline sourcing?
See About Kangsong for company scope (founded 2004; fuel-pump assemblies and electronic injection pumps) and use Contact for MOQ and lead-time quotes.
Are inline fuel pumps good on a diesel, or does the answer depend on which pump?
They are good when the form matches the job. An external supply pump is a reasonable fix for a weak feed. It is a poor purchase when the failed part is the injection pump that meters each cylinder.
What is the best inline fuel pump for fuel injection if the injection pump is already on the engine?
There is no universal winner once the injection pump is already fitted. Keep that pump if it meters cleanly, and only change the lift pump when the supply side is the part that starved it.
Is a 120 volt diesel fuel pump the same purchase as a vehicle inline injection pump?
No. A 120-volt unit is typically a transfer pump for a tank or a drum. A vehicle inline injection pump is engine-driven and builds injection pressure for the cylinders.
How long does an inline fuel pump last when the phrase covers two parts?
Life depends on which part you mean, and on fuel cleanliness. Community comments treat distributor pumps as shorter-lived than inline injection pumps because they are fuel-lubricated, while a supply pump often fails at the motor or the screen. No single hour figure belongs on both.
Can the inline injection pump pull fuel from the tank with no supply pump?
Some high-mounted tanks can gravity-feed a pump inlet. Most road vehicles still rely on a lift pump because the tank sits low. Running the injection pump dry of liquid fuel is a fast way to score a plunger.
Why can a healthy-looking injection pump still misfire after a filter or hose change?
Air entered the low-pressure side. The injection pump then compresses that air instead of sending a solid pulse. Bleed liquid fuel through to the pump inlet before you condemn the metering hardware.
About Kangsong
Zhejiang Kangsong (Kangsong, 浙江康松) is an automotive fuel pump OEM / manufacturer of electronic fuel injection pumps and fuel-pump assemblies. Use this page’s technical decision first, then open company and product paths:
- About Kangsong — manufacturer profile and quality notes
- Contact / Inquiry — RFQ, samples, MOQ and lead time
- Land Rover Freelander 2 2.2 Diesel fuel pump assembly — printed fitment only as shown on that product page
- Products catalogue — browse when the vehicle is not on a single PDP
