Quote:
Originally Posted by switchlanez
These noises are due to alcohol mixed fuels and are inherent to Subarus based on what a Subaru master tech told me (mine was the first BRZ he serviced). I once had an occasional chirp but when I switched to 93 octane ethanol-free fuel, it went away.
From my understanding the TSB replaces the existing HPFP with the same HPFP, correct? Or do they re-install it a different way? My friend is on his 3rd HPFP (replaced twice) and the chirps eventually came back in each instance. He hasn't been using ethanol-free fuel so I believe it's all in the fuel.
My other friend conducted a test. He used 93 octane ethanol-free fuel and had no chirps. Then switched to 93 octane *with* ethanol and the chirp came back. Then switched back to ethanol-free 93 and the chirp was gone.
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Yeah, ethanol free here in Texas is impossible from what I've seen. All gas stations have at least 10% ethanol in them. I'm going to research and see if I can find one that is ethanol free just to see about the chirp. I know this is one of the reasons the GT86 owners in other countries haven't had issues with this because they're ethanol free from what I read.