I thought the ignition had to be on to give power to the pump??

@@desertmandan123 Nope opening the door you can usually hear it prime

@@gGeorge96 That's utter crap buddy.

@@desertmandan123 I own a 2014 Audi A6, Done my own maintenance since I got it, replaced my own 2.0t engine after a bad timing chain tensioner killed my engine, and also I am a mechanical engineer. On a push button start the low pressure fuel pump is primed when driver's door is open. VW auto group has used the door open as a signal to prime the fuel pump since the 90s, maybe earlier. I think you don't know what you're talking about.

​@@desertmandan123 BS it is, I have an SQ5, pump primes everytime I open the door.. listen to advice otherwise go away clown.

Well same as on any other car, there are many many videos how to bleed brakes, so I will not reinvent the wheel. Make sure that reservoir (master cylinder) does not run dry, otherwise you will need to bleed ABS system as well (ABS is bleed via VCDS basic settings). Pressure bleeder is very very recommended. Also 2 person pumping method, 1 person bottle method, vacuum pump, or gravity would work ok. Since these are not so safe, because you need to really be careful not to introduce air into the system, pressure bleeder is still the best. However, it is doable.

dr. sunka thanx for the extensive answer!

Wouldn‘t it be better to turn the accessory power on & off multiple times instead of leaving it on? Because on BMWs the fuel pump which feeds the fuel to the high preassure pump only primes for about 5sec. before shutting off. So you could repeat the process x number of times to fill the system with fuel. But I agree with you, that you should pre fill the filter if possible, so you get less air in the system to begin with.

Every 60.000 km.

It's not okay for the high pressure pump, this is a costly mistake, you should bleed the system before attempting to start the engine

4G0 127 401

He shows that in the first 5 seconds of the video.. See the fuel cap

That's false, diesel filters should be replaced every 60k on this A6. Petrol filters should be fine for lifetime, but it is recommended to change them as well.

@@sunkazz I'm from India...My Audi A6 C7 vibrates when the engine is running...Do I need to change the Engine mounts? And Also My rear Air suspension doesn't work but there is suspension symbol showing on the Infotainment and mechanics told me to do complete coding to sort the issue..it will be great if you share Whatsapp number...I'll explain more in detail and kindly help me to sort out the issues

no filter ever lasts for life....although main dealers never seem to change any service items....although they do charge customers for doing them

Ebay

On A6 TDI it is recommended to change the fuel filter on every 60.000 km.

Correct

@WH ROBY High pressure fuel system

Need a video on this process as well...

Really? I filled the filter with fuel before I fitted it and my car started up straight away........it drives very well and there is no lack of power......I've just changed it again after 20,000 miles and guess what, same method and she starts straight away.Why is that then??

@@desertmandan123 Yes really. You could have just as easily sent an air bubble through to the HPFP, destroyed it and sent metal shards through the fuel line. That's upward of $7k to replace all the parts affected.

Well think about it, what can air (that is air-fuel mixture = 1) do to an engine. It will just not start up until air-fuel is just about right. For running pumps dry, however, is another story.

@@sunkazz is the high pressure pump before or after the filter? 🤔

@@vlmxs It is in the fuel tank (so to say before the pump).

@@vlmxs the hpfp is located after the fuel filter. it's on the engine with the hard piped fuel lines as the pressure it produces is extremely high hence the name "high pressure fuel pump". This type of pressure would blow normal fuel lines and the fuel filter to pieces. It needs to be fully lubricated at all times by diesel otherwise you run the risk of damaging it. You should always prime the system with vcds or obd11 ect to prevent damage.

@@sunkazz the low pressure pump is in the tank, the high pressure pump is on the engine. The low pressure would naturally prime when you "key on" the ignition anyway

Я да😜

Just a regular service precaution (diesel engine every 60k).