I don’t know any more, my car just throws me up!

Hi guys! On Whit Monday, my Audi let me down for the first time. I drove around with my girlfriend all day and parked my car with her! After a few hours I wanted to drive and started the engine and went out immediately! Repeated several times until the battery was almost empty! Was also no power because the battery is certainly 6 to 7 years old and quite up! Colleagues called and towed the car and tried to run again in the 2nd gear car! D he engine ran very badly but did not take any gas…. So give car to the known car dealer, who had checked so far everything, ignition, relay 208 for fuel pump etc. his fault cause => petrol pump defective! So I got to the scrap and ne used for 35 euro! On Tuesday I could pick up my car again and the car ran again! The only thing I noticed was that he needed to jump “longer” than before! Well then to work in the morning about 30 km and my Audi ran ga 9 hours later after work the same problem as Whitsun Monday! Incredible! And every time the car ran and when it is a few hours it doesn’t start anymore? Then I immediately called my friend and then he said that I should take out the relay 208 and “cut” against the body. Said done and I immediately noticed that the car sounded “better” and wanted to start but the battery was empty! So I still kind of got on the road! Nelle new relay can find and let me tow again from my mother, 2nd gear in and the car jumped in immediately! So petrol pump was probably not defective! Yesterday morning I wanted to go back to work, and I had to start the car 3 times before it started! But it runs then too! So let the car driver and error memory read out again! No error available! Engine data checked like Lampdasonde, coolant temperature, speed etc. All i.o. So we have to Testzwec ken ne new battery built in! I don’t have to order 3 times as with the old one now, jumps now the first time but my Audi needs significantly longer than before! I can puke! Would my car give away in a few months and get me a new one with gas system! Mine has now 220,000 km down! What else can it be? Wrong petrol pump? The used one is cylindrical like my old one, has only no filter before! My audio is built in 04/1993. Cooled emperaturgeber?