17 hours ago, Stevey Y said:

Hi if you get the car test driven whilst plugged in they should in theory drive over a ramp and if all the ignition and injection feeds are on graph and logging, you should then be able to watch it when its returned to see which circuits bumped when you crossed the ramp.

Steve.

Hi steve 

My previous mechanic plugged in his diagnostic computer and looked at the live data for the fuel system. He noticed there are two fuel level readings or lines — and when we went over a ramp, one of them dropped suddenly and went very low while the other stayed normal. He said that could mean a problem with the fuel sender, fuel transfer system 🤷🏼‍♀️

6 hours ago, Lolos A6 said:

Hi steve 

My previous mechanic plugged in his diagnostic computer and looked at the live data for the fuel system. He noticed there are two fuel level readings or lines — and when we went over a ramp, one of them dropped suddenly and went very low while the other stayed normal. He said that could mean a problem with the fuel sender, fuel transfer system 🤷🏼‍♀️

Hi not quite sure but I believe there are two fuel units under the back seat one has the pump in it on the O/S and the N/S has a sender attached to it that bit is fed by the lift pump, ask him to live data the lift pump at idle the readings should be around 400 anything above that it means the main lift pump is struggling especially if when revved the readings go sky high, my theory is your lift pump is probably worn and the level compartment is starved of fuel when it goes over a bump and registers as empty which will cause it to cut out, never had this problem with my car but a few other later Audis I have worked on have had this set up and you have to remove the rear seat cushion to get at the pump etc.

Steve.