Over the winter I've put on a new fuel filter but otherwise changed nothing with the fuel system and now I'm getting a fuel pressure reading off somewhere between 2.7 bar - 3.3 bar. On the dyno (with nothing else changed year on year) I'm also now down around 25bhp.
I've tried another fuel filter, fuel pump, and a different pressure sensor and nothing has fixed it. I've got a new FPR to try but I can't see how it has failed while not being used over the winter?
Any ideas on what could be wrong? I still find it suspicious that it was fine until the fuel filter was changed but with another filter (different brand) I get the same issue!
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