Thanks for the test proceedure. That's very interesting that they don't go by pressure, but by volume to an open hose.
Every other one I've ever done was with a pressure meter, and specific pressure range.
So, let's say it puts out the correct amount of fuel? What else could be the problem with my car?
It runs fine around town, but if I try and go faster than 65/70mph for more than about 10 seconds, it flashes the CEL, and then cuts injectors and the engine runs rough.
It also flashes the CEL if I go WOT through the gears for more than a few seconds. And I've noticed that this engine pings, and sounds like it's lean when you get on the throttle, like it needs more fuel. It is however very fast, and smooth around town, even if the CEL flashes on WOT, as soon as I back off to normal cruising speed throttle, it stops flashing, and just remains lit.
The RossTech scan indicates muliple random misfires. I've cleared it, and it comes right back.
And when I bought the car it ran fine up to 120mph, or on the very top end of WOT, it would flash the CEL a very short amount of time, but then went off, and stayed off. (I've seen that happen on my 2004 A8L too, so I figured it was perhaps the MAF? I've seen MAF codes come and go, but did not have the RossTech tool to check this car before I bought it.
If it's not the pump, what could it be? (I've changed out the filter, had the injectors cleaned and tested and I've replaced the bad vac lines etc. There are no vac leaks, and I've gone around the intake with carb cleaner, and there are no gasket/manifold leaks either.)
I'm stumped, but think it's the fuel pump starting to fail.
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