Over the past six months, the fuel pump has gotten louder in my '79 308. A very annoying high pitched whine that is quite audible from the cabin--even over the engine. After a 3-5 minutes, the pitch note changes to something that is a lot less annoying. It's the original pump--and from both my mechanic and all you wonderful fchat folks, it sounds like this is a common failure point. So I replaced it this week with a new Hardi 18812 pump. Also the PO had gotten rid of the 3-way valve that enables a bypass in the event of a severed line and replaced with a straight 3-way hose fitting. In other words, the pump was not only pressurizing the carb feed lines, but also bypassing back to the input of the pump (yes, this is a bad setup). I'd thought that change of pitch might've been the pump struggling to build pressure b/c of that bypass and then finally being successful as the system reached an equilibrium. So, before replacing, I also took the opportunity to record the pump sound both with and without the bypass (using a hose clamp). Turns out it didn't make a difference--that pump was just loud and as it warmed up, it simply changed it's note. So after replacing the pump AND removing the bypass entirely (set up like the EU-spec cars), it's so so much better. I can still hear the pump lightly before the engine is started, and then nevermore. Will post a couple videos of the before and after.