3,000 miles since a full engine rebuild on my 2001 A4 Avant 2.8
new oil level sensor
new fuel filter
just changed oil
cranks well
sorry in advance i an 16 and its my first car, and my first engine that i rebuilt, when it ran there where no problems with idle or anything like that

 

Did you check the fuse for the fuel pump, or swap relays? Are there any codes stored?

 

the fuse is good and i replaced the fuel pump relay just today

 

Can you confirm you have voltage to the fuel pump connection and an earth to the other side?

 

Do you have access to VAG-COM and if so, what codes are stored?

 

no codes just started very rough have to pump the gas pedal to get it to run backfires alot

 

now it starts then dies almost instantly

 

Check your engine coolant temperature sender. If you have to pump the gas or hold it open to get the car started that's a CTS failure. ECM thinks the engine is hot and holds the injectors open longer while cranking, basically resulting in a flooded engine.

 

i tested the coolant temp sensor and it tested good, now i don't have fuel at the rail again. i cant hear the pump humm while cranking or when i turn the key either.

 

please help!!!!!!!