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[Solved] Fuel System Venting Post Fuel Pump Replacement on BMW e46 2.0d 320d 136km 2000

Kikiki94 16878 17
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Do I need to bleed the fuel system after replacing the fuel pump in a BMW E46 320d?

Yes — if the in-tank pump works, turning the ignition on several times should fill the whole system. Replace the fuel filter at the same time and fill it with diesel to make bleeding easier [#17020856] [#17024518] If the pump in the tank had stopped, the system may be empty and harder to draw fuel, so it may take longer to prime [#17023790] If it still will not start, loosen the injector lines and crank the engine until fuel reaches them; one reply also notes the pump may not run because of the pump controller or, on some cars, because the fuel level is above half a tank [#17029904] [#17593831]
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  • #1 17012895
    Kikiki94
    Level 8  
    Posts: 11
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    do I need to vent the system after replacing the fuel pump ??
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    #2 17012921
    robokop
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    It can be a fuel pump.
  • #3 17012939
    Kikiki94
    Level 8  
    Posts: 11
    Rate: 7
    I hope this is because I have already ordered a second one. And after turning to ignition, you can not hear that the tank turned on.
  • #4 17020856
    kristoferson22
    Level 11  
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    When replacing the pump, immediately replace the fuel filter and fill it with ON, it will be easier for you to bleed the system.
  • #5 17021546
    Kikiki94
    Level 8  
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    kristoferson22 wrote:
    When replacing the pump, immediately replace the fuel filter and fill it with ON, it will be easier for you to bleed the system.
    so just fill the ON filter? And you can't do it without it?
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  • #6 17023790
    kristoferson22
    Level 11  
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    If the pump in the tank has stopped working, it sucked everything out of the system and it will be difficult to draw fuel.
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  • #7 17024110
    Kikiki94
    Level 8  
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    And if he turns the ignition key several times, should he chase away?
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    #8 17024518
    lato8
    Level 16  
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    As the fuel pump in the tank works, turning the ignition several times will fill the entire system.
  • #9 17027206
    Kikiki94
    Level 8  
    Posts: 11
    Rate: 7
    I put in a second pump but it doesn't work anymore, I don't know, I have no idea and I don't know how to check the voltage in the ankle, because if not a pump, it's probably nothing else like this ankle.
    I put on the old pump for a short time and hey, I switched the relays and checked the fuse and nothing but a cube ... So what to do now ????
  • #10 17028356
    lato8
    Level 16  
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    briefly pump in the tank and try to smoke
  • #11 17029280
    Kikiki94
    Level 8  
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    I did exactly that, After a while it fired but I released the gas too quickly and now I don't want to get it anymore.
  • #12 17029741
    lato8
    Level 16  
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    The pump must work all the time, as it pumps fuel, and the car does not ignite it may mean that the fault is elsewhere.
  • #13 17029904
    żałosna udręka
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    Loosen the injection tubes. By turning the engine you will catch such a position that the pump in the tank will overflow the injector. You turn off this tube and spin the engine until the next injection. 1342 order. Otherwise there will be a lot of spinning, and the VP pump may not release. I started the pump with a plus on the fuse.
  • #14 17031112
    Kikiki94
    Level 8  
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    Ok thanks today I will. And how to run this plus on the fuse
  • #15 17031358
    żałosna udręka
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    The fuse is not in this car. I was wrong. Ignition switch in E46.
  • #16 17031492
    Kikiki94
    Level 8  
    Posts: 11
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    Well, I have it for now briefly because it does not get electricity as it is normally connected. And if the fuel pump does not get electricity, it can also be that and the injection?
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    #17 17593831
    naprawa-pomp.com

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    If the pump controller is damaged, if the computer catches any errors, the pump in the tank may not work. The second thing is that it is true that another brand but if there is a certain amount of fuel certainly more than half the tank, the electric primary pump does not turn on, at least after turning the key to position one.
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  • #18 17594818
    Kikiki94
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    With the help of people
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Topic summary

✨ After replacing the fuel pump in a BMW e46 2.0d 320d, it is essential to vent the fuel system to ensure proper operation. Users suggest replacing the fuel filter simultaneously and filling it with fuel to facilitate bleeding the system. If the pump has failed, it may have emptied the system, making it difficult to draw fuel. Turning the ignition multiple times can help fill the system. If issues persist, checking the pump's electrical connections and ensuring the pump controller is functioning is crucial, as a damaged controller can prevent the pump from operating. Additionally, loosening the injection tubes can aid in priming the system.
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FAQ

TL;DR: After replacing the BMW E46 320d fuel pump, bleed by cracking injector lines and following the 1‑3‑4‑2 firing order; "Loosen the injection tubes" to speed venting. For DIYers fixing no‑starts after pump work. [Elektroda, żałosna udręka, post #17029904]

Why it matters: It helps E46 320d owners quickly restore fuel delivery and avoid needless cranking after pump replacement.

Quick Facts

Do I need to bleed the fuel system after replacing the pump on an E46 320d?

Yes. The forum guidance is to replace the fuel filter at the same time and prefill it with diesel to ease bleeding. This shortens cranking and helps the high‑pressure pump receive fuel quickly. [Elektroda, kristoferson22, post #17020856]

How can I prime the system without special tools?

If the in‑tank pump works, cycle the ignition several times to position II. That primes the lines and filter. Then try starting. If the pump is silent, address power or the pump first. [Elektroda, lato8, post #17024518]

Why won’t it prime if the in‑tank pump failed?

A failed tank pump can empty the feed lines. The engine‑mounted pump then struggles to draw fuel, so bleeding becomes slow and difficult until you restore supply. [Elektroda, kristoferson22, post #17023790]

How do I bleed through the injector lines without a scanner?

Use the injector‑line method: 1. Slightly loosen injector pipe nuts. 2. Crank; when one overflows, tighten it and move to the next, following 1‑3‑4‑2. 3. Continue until it fires. “Loosen the injection tubes” to speed venting. [Elektroda, żałosna udręka, post #17029904]

What is the firing order for the BMW 320d (M47)?

The cited procedure uses 1‑3‑4‑2. This sequence ensures each injector gets bled as its cylinder reaches injection during cranking. "1342 order." [Elektroda, żałosna udręka, post #17029904]

Should I prefill the fuel filter when swapping the pump?

Yes. Prefilling the new diesel filter reduces air in the circuit and makes bleeding easier after pump replacement. It’s a recommended time to change the filter anyway. [Elektroda, kristoferson22, post #17020856]

The pump runs, but the car still won’t start—what next?

If the pump operates continuously and you still have a no‑start, the fault lies elsewhere. Check for injection, rail pressure, or other engine management issues. [Elektroda, lato8, post #17029741]

Can I power the in‑tank pump directly to test it?

For diagnosis, you can briefly power the in‑tank pump and attempt a start. Do this only short‑term to confirm supply, then fix the root cause. [Elektroda, lato8, post #17028356]

Is there a fuse I can jump to run the pump on an E46?

One poster corrected themselves: there isn’t a simple fuse‑jump method noted; the E46 uses ignition‑switch control for pump operation. Use normal key‑on sequencing. [Elektroda, żałosna udręka, post #17031358]

My pump won’t run at key‑on; could ECU faults be the reason?

Yes. “If the pump controller is damaged, if the computer catches any errors, the pump in the tank may not work.” Scan and repair before further cranking. [Elektroda, naprawa-pomp.com, post #17593831]

Should I always hear the pump at key‑on?

Not always. An edge case noted: on some cars (other brand), with more than half a tank, the primary pump may not run at key‑on. Absence of sound isn’t definitive. [Elektroda, naprawa-pomp.com, post #17593831]

Will excessive cranking damage or stall the VP pump during bleeding?

Avoid long cranking. As warned, excessive spinning wastes time and “the VP pump may not release.” Use the injector‑line bleed with the 1‑3‑4‑2 order. [Elektroda, żałosna udręka, post #17029904]
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