I'm thinking it's most likely fuel pump and a faulty check valve from what I'm reading.

I'm struggling to find information on where the FPR is located on these cars. Some resources suggest it's built into the filter, and others show it requires removal of the fuel rail to access and resembles a GM/Ford style thermostat in shape. Kinda.

Where is it?? lol.

I'm quite excited at the prospect of finally fixing this issue. I suspect it's also the reason for the random stalling the car used to have (not so much lately) that occured when driving very slowly (like gas station speed) after driving for hours on a highway. And apparently it can also be responsible for the occasional smell of gas.

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