Ok I give up. My fuel pressure tester and the TWO I bought on Amazon all fail to fit on my E53 M54 fuel pressure test port Schrader valve.

The one I have is far too large.

The first kit I bought came with so many brass fittings I stupidly assumed one would fit.

The second kit I bought supposedly fit "standard tire size" Schrader valves, which I was led to believe is what the M54 has, as well as most Ford's. But when I go to screw it on, it seems to be the right thread but it never stops turning. But I've got other things that do bottom out with the right thread so it's not the test port being stripped.

The fitting with that kit is very short. The first 2/3 of the brass is unthreaded and then it's got some threads at the top of the fitting. I'm wondering if that's the problem - too deep of a fitting?

I just ordered a CTA 3445 fuel pressure tester on Amazon. It's $50 instead of $30 which kinda sucks, but it's labeled BMW/Volvo, so I'll roll the dice on it. Unfortunately not here until Tuesday.

Will it work?? Or is there some magical dance BMW wants me to do to reveal a functional fuel tester to me??

Harbor Freight sells one that's pictured in an article online that talks about E53 fuel pressure testing. I can maybe get that one sooner than Tuesday but don't want to go through the effort to drive to HF if it's not going to be useful... Anyone used that one on our cars?

__________________
2006 BMW X5, 3.0i - 161,000 miles
2003 Ford Mustang GT - because having Two cars that keep dying seemed more exciting.