On the race car I have a fuel pressure sensor and an Omex 3.5 bar fuel pressure regulator. In my last race (October 2020) there was no issue with fuel pressure at all, the data shows it sitting nicely around 3.5 bar.

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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Rallye Race Car

It's not. I've tried a new, adjustable one and can't get any more than 3.1 out of it. It's the Omex adjustable one so should go from 2 to 5 bar.

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Rallye Race Car