After filter work, a run-dry, or any air entry on the low-pressure path, the diesel supply side needs fuel before a normal crank — that is the job behind how to prime a diesel fuel pump. Counters in the United States treat fuel pump priming as filling that supply path, and they treat how to bleed a diesel fuel pump as the shop name for clearing air on the same side. The year sheet then picks the printed path: hand primer, key-cycle electric lift pump, or filter-head bleed screw.
When the diesel supply side needs fuel before crank
After filter work, run-dry, or air entry, the supply side needs fuel before a normal crank. A fuel filter service that opens the canister, a tank that ran empty, a loose suction clamp, or a line that was cracked open all leave air where diesel should sit.
The printed service path for that truck is what fills the path again.
- Some layouts use a hand primer on the lift pump.
- Others run an electric lift pump at key ON without starting.
- Others open a bleed screw on the filter head while fuel is moved through the housing.
This page stays on that supply-side decision. The tank-to-injector story already lives on diesel fuel pump operation, so it is not retold here.
Why air on the supply side blocks a start
Air in the supply path keeps the injection pump from building useful pressure. An air in supply line pocket at the filter head, the suction hose, or the lift-pump outlet is enough to leave that pump starving on the first crank attempts.
That is why shop notes warn against cranking and hoping. Long starter heat does not replace a printed prime. Air on the supply side is a fill-and-vent job first.
People also ask what happens if there is air in a diesel fuel pump. For this counter desk, the useful answer is smaller: clear the supply path the sheet names, then start. High-pressure joints are a different service window.
Match the printed priming path on the year sheet
Hand primer, key-cycle electric pump, or filter-head bleed — only the path the sheet prints. The SERP often sells one brand family recipe. The desk still opens the year file for the truck in the bay.
| Printed path | What the counter looks for | What stays off this page |
|---|---|---|
| Hand primer | Plunger or bulb on the lift pump or filter head; pump until fuel shows at the named bleed point | Invented stroke counts |
| Key-cycle electric lift pump | Key ON / RUN without crank so the electric supply pump can move fuel; more than one cycle only if the sheet says so | Universal second counts copied from blogs |
| Filter-head bleed screw | Low-pressure vent on the filter head while fuel is moved through the housing | Bleed-screw torque guesses |
| Out of scope | Crank until it fires, jumper, hotwire, or bypass | Any of those as a procedure |
On one ECM-controlled electric supply family, key-on closes the fuel pump relay so battery voltage reaches the pump for a short controlled window, then the key must be cycled again before another run.
That pattern belongs to that bulletin’s engines. It shows why a key-cycle path exists without authorizing a timer for every diesel on the lot.
On a lift-pump prime procedure for one heavy-duty family, the instruction is key ON without starting, with air taken off the low-pressure side — not from a high-pressure joint. Owners on mechanical lift-pump trucks describe the other path: loosen the filter-head bleed screw, pump the hand primer until fuel exits, then close the screw and start.
If the printed title on the desk is a Freelander 2 2.2 diesel supply assembly, match that module only inside its own OE window later on this page. Other trucks stay with their own sheet and the product catalog.
What diesel fuel-pump priming is not
Not an HP joint vent, not crank-until-it-fires, and not a retell of the operation page. Priming here means the supply side. It is not a common-rail high-pressure rebuild and not a wiring job.
The naming split between supply and injection is already covered on fuel pump vs injection pump. Conductors for an electric supply pump sit on diesel fuel pump wiring diagram. Injection-family catalog entry points sit on the high-pressure diesel fuel pumps hub.
Hard stops for this article:
- No jumper, hotwire, or bypass as a priming method
- No “crank until it fires” as the procedure
- No invented PSI, pin colors, or bleed-screw torque
- No gasoline C/K kit offered as a diesel primer part
When priming fails because air keeps entering
If air still enters on the suction side, the system will not stay primed. Filter work can be done correctly and the truck can still suck air through a cracked hose, a missing O-ring, or a clamp that never seated.
From the field: After a fuel filter replacement no-start, one shop found a bad hose clamp on the line from the tank to the low-pressure pump that was leaking just enough to let air into the system — Cummins Forum filter no-start thread.
When the hand primer never firms, or the electric pump runs but the filter head keeps burping air, stop inventing longer crank bursts. Re-check the suction path the sheet shows: seals, quick-connects, drain valves, and the clamp points owners already chase on the boards.
A weak or empty tank also looks like a prime failure. Put real diesel in the tank before blaming the lift pump. Then return to the printed path in the method table above.
Choose the Freelander 2 2.2 diesel product when priming points to that supply module
Use that assembly only inside the printed Freelander 2 2.2 diesel title and OE lines. Once the priming path is locked to the low-pressure supply side, quote this module only when the desk job is that Freelander diesel window — never as a generic primer tool, and never in place of a gasoline C/K kit.
The Freelander diesel PDP heading prints Land Rover Freelander2 2.2 Diesel. Beside that heading sit the OE and assembly codes LR038602, LR005622, LR010432, LR010434, LR029279, and KSA597A. Match those codes to the unit on the counter before you treat the assembly as the supply replacement behind a failed prime.
| Application line shown for priming-related Freelander diesel supply fit | Matching engine print on that PDP |
|---|---|
| 2014 Freelander 2 Diesel 2.2 SD4 4×4 AWD | L359 · 2179cc · 140KW · 190HP · 224DT |
| 2014 Freelander 2 Diesel 2.2 TD4 4×4 AWD | L359 · 2179cc · 118KW · 160HP · 224DT · DW12BTED4 |
| 2013 Freelander 2 Diesel 2.2 SD4 4×4 AWD | L359 · 2179cc · 140KW · 190HP · 224DT |
| 2013 Freelander 2 Diesel 2.2 TD4 4×4 AWD | L359 · 2179cc · 115KW · 156HP · 224DT |
| 2012 Freelander 2 Diesel 2.2 TD4 4×4 AWD | L359 · 2179cc · 115KW · 156HP · 224DT |
Pull the Freelander 2 2.2 diesel fuel pump assembly only when the bay matches that priming-scoped table. If the truck is outside those lines, leave this SKU and continue in the product catalog.
Have a qualified tech complete the install on that vehicle. Cross-check year, brand, and model to the Freelander diesel part number before purchase. That step confirms supply-module fit after you finish the priming decision — it is not a universal filter-prime recipe.
FAQ
How do you prime a diesel fuel pump after a filter change?
Open the year sheet for that truck. Most filter jobs use the hand primer and bleed screw on the filter head, or a key-on electric lift-pump cycle, until the supply side shows fuel without a steady stream of air. Do not invent a timer from a blog overview.
Is “how to bleed a diesel fuel pump” the same job as priming the supply side?
In shop talk on this page, yes — both names mean clearing air and filling the low-pressure supply path. Neither name is permission to open high-pressure joints or to rebuild the injection pump on a blog checklist.
Do you need to prime a diesel after running out of fuel?
Yes. A run-dry leaves air in the supply path. Refill the tank, then use the printed prime path before treating the no-start as a failed injection pump.
How do you use a hand primer and bleed screw?
Locate the hand primer and the filter-head bleed screw the sheet names. Open the bleed point only as far as the sheet allows, pump until fuel appears with little or no air, close the bleed point, and confirm the primer feels firm if that layout uses firmness as the cue. Torque values stay on the sheet.
How do you prime a diesel that has an electric lift pump?
Use the key-on / key-cycle path the sheet assigns so the electric lift pump can move fuel without cranking the engine into a long starter pull. Some families need more than one key cycle. The sheet sets that count; this page does not publish a universal second count.
Can you just crank the engine until it fires?
No. Crank-until-it-fires is not the priming procedure on this page. Clear the supply side first, because long cranking risks a hot starter and still leaves air in the path.
Why won’t the system stay primed after filter work?
Look for air still entering on the suction side — clamps, O-rings, drain valves, and quick-connects — before replacing the pump. A prime that will not hold is often a leak, not a missing “extra” crank burst.
Is the Freelander 2 2.2 diesel assembly a universal priming tool?
No. It belongs only to the Freelander 2 2.2 diesel lines in the table above. Other trucks keep their own year sheet and a different catalog match.
