It's better to whip off the inlet manifold, seems a pain in the arse and a lot of work but not too difficult, then the FPR can be easily accessed. I've also done the job with the manifold on, I ended up lying along the drivers wing which made access much easier. The good thing about taking the manifold off is that you can do a proper check of all the local fuel pipes and hoses, also it's important not to damage the small gauze filter and o-ring and to be certain that the metal gasket is located properly before refitting. You can recondition the FPR yourself or buy a new replacement.