Bmw e46 330d i cant hear the priming diesel pump working when ignition is switched on

ok,
all fuses good.
glow plugs test okay.
all filters good. fuel and air
fuel pumps all primed.
try test fuel? using a spray bottle with diesel in it ,past air cleaner point. if that works (runs)for say 3 seconds, the injectors are not injecting fuel.

For injector pulses, one must go back to the source; crank shaft position sensor and wiring issues.
The pump will work for about 30 seconds when the ignition, (weird as diesels don't have a spark), is first switched on to prime the fuel lines and injectors. This is normal. The pump stops if there are no pulses from the position sensor.
The position sensor is probably not at fault but the wiring harness has a break or bad connection.

There is only a few cars fitted with an ancient petrol injection system that needed any priming.

Diesel engines mostly need the injection system priming but petrol injection systems do not.

Lots of cars use a system where the fuel pump runs for a couple of seconds when the ignition is switched on and that is all the time it takes to prime the fuel system. After a couple of seconds the fuel pump switches off and waits to restart when the engine is cranked.

As priming the system takes only a couple of seconds some manufacturers don't bother with the brief priming run of the pump and just have the pump start when cranking.

Could be faulty supply, fuse, pump relay or the pump itself.
If the car is fitted with an immobiliser, perhaps that is the problem.

I'm guessing that you got an air lock in your fuel system as a result of your changing the fuel filter... I certainly don't know about a BMW diesel, but in most semi-truck engines, there is a priming pump just for the purpose of getting the air out ... and the fuel into.... the fuel system. I've even been known to fill the filters with diesel fuel before screwing them onto the base.. This is risky because of the possibility of allowing some foreign, unfiltered debris to get into your pump and/or injectors, just because of your putting unfiltered fuel into your filter... Check and see if there is some kind of priming pump close to the filter. Also, a possibility is that you may have an electric fuel pump.... as to where all you may need to do is loosen a fuel fitting on the pressure side of the pump and filter.... and allow the electric pump to purge the system of air.. I confess to my lack of knowledge on your BMW.... but, I do have some basic understanding of most diesel systems... Good luck..

Is it electric or mechanical pump? Electric is with fuel injection. If its fuel injection, you should hear the pump run when you turn ignition switch. If u don't hear it, try starting, if no, turn off then on. It will self prime. Carburetor is with mechanical pump. I usually put few drops of gas in the carb. Start it, if no, more in carb till it stays running.

Check to see stop solenoid is working, you may be able to do this by getting someone to turn the key on and off slowly while you are hold your fingers against the side of it.
It is the small metal (Nut) with a wire going into it for an easy description.
The reason you have to choke the engine to stop it is you have either no power going to the switch or the switch is not working properly. i would think more that the switch may not be working properly as it is meant to close fully when power is turned off, if this was working it doesn't matter how much the motor is reving it will still shut of the fuel to the pump.
Sometime these solenoids get a bit of dirt etc stuck in them s well, this is usually just a easy fix,clamp the rubber fuel line before the pump, undo the switch, clean it and refit it, then undo the clamp and prime the pump using the hand primer.
Then start the vehicle, don't try to start the vehicle before you have reprimed the pump as you can damage the engine if you don't have fuel going into it.
Hope this helps, and good luck with it.
Dont rush working on a diesel, just take your time mate.

Did you check for fuel pressure on the line from the tank while you had the filter off? Do you hear your fuel pump prime when you turn the ignition on? First I would listen for the hum of the fuel pump when you turn the key to the run position (not starting the engine) May have to get a helper and listen at the gas filler neck with the cap off. If you dont hear your fuel pump, check your fuses and relays. If the relay clicks when your helper turns the key on ( put your finger on the relay and ear down close to feel/hear the relay actuate)., and fuse is good, yet you do not hear the pump prime, I would say your fuel pump is shot.

If it is a diesel,check for fuel pressure coming off the direct drive pump hose while cranking the motor.

Mike

Hi , this sounds like you have a couple of problems , firstly with the non starting after the engine has been running ,,, this is normally fuel pressure retension or the pre supply pump under the vehicle is faulty , the easiest way to check the pump, is when your vehicle doesn't start with the ignition lights still on , see if you can hear a buzzing noise from under the vehicle just behind the left hand front wheel , this will only prime itself for approx 20 seconds so it may be easier to have the help of someone , if you dont hear the buzzing turn the ignition off for 1 minute and switch on again , if there is no buzzing noise , replace the pre supply pump , the seccond fault with the blower motor running with the ignition off is a simple fault , this will require a replacment heater resistor , the resistor fails and drains the battery so it will cure the blower fault and the flat battery, hope this helps , regards mark

Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead

LEAKS AT THE INJECTION PUMP CAN BE COMING FROM DIESEL INJECTION PUMP DRIVE GEAR INNER SEAL.LOOK FOR LEAKS AT FUEL SHUT OFF VALVE AND COLD START VALVE.