I bought it from a German Audi site, I had to become a member in some club. Not sure how I did it since most of it was in German but it seemed legit. But of course, the new pump could be failing, although 've only had it for three months.Where did you get your new in tank pump from? I bought a new Bosch in tank pump for my S2 18months ago and it failed after less than 2k. I bought it from a previously trusted ebay seller but I strongly suspect it's a Chinese copy.
Have you taken the car for a good drive yet? That should get any remaining trapped air out. Make sure the fuel hoses especially on the tandem are good condition and not cracked and tight onto the tandem.
Hmm, I needed a lot of cranking to get mine fired up after I changed the tandem. Probably not a good sign. Do you think it's possible that a new tandem pump could draw in air where the old one was to weak to do it? IBy a strange coincidence, just done a tandem pump on an A3 tdi today.
Slightly different issue. Oil in the fuel filter. Internal seal in the pump had failed.
On re assembly, there was no priming necessary. Engine fired straight up no issues.
Another thing to check is that your screen in the tank isn't blocked. Did you change the in tank pump?
Same position as the A2, looks a little bit different though.
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Yes, I hear the pump when I turn on the ignition. No, there's bubbles in the fuel when I pump/prime manually at the inlet hose by the tandem pump, not a lot but a always a few. But from what you said earlier I'm now wondering if this could be due to air entering the return hose while I've disconnected the inlet hose. Could this be possible?So when you turn the ignition on you hear the tank pump run? That will pressure feed fuel up to the tandem and back down the return line to the tank. When the engine is started the tandem pressure feeds the injectors with the extra fuel still returning to the tank. This set up should self bleed out any air. Are you getting fuel without air bubbles to the tandem? What tandem did you fit?
Later cars only have the tandem and are very capable of dragging the fuel from the tank. Is there trapped air in the fuel filter? All connections correct on the fuel filter?
This is the in tank pump:I haven't done an in tank pump on an A2 but have done a few on the S2. If they are similar, the pump sits in a cradle which is held in place in a cage. The whole cage is removed by twisting anti clockwise. You then get to the filter screen at the bottom which is often blocked up with crud. There is another screen on the bottom of the pump. To do the job properly, you need to drain the tank and clean out all the crud in the bottom before replacing everything after a good clean. This might cure everything you are experiencing.