might be a bit of a hassle but a trip to your local junkyard for parts will be worth it, they shouldn't cost more than 10k for the motor (or atleast 15k in total)
also, if you want peace of mind then go to honda dealership and get the work done with guarantee.
thirdly, if you still have doubts then take the car to a few more mechanics and tell them psf is leaking and nothing more. get them to try and pin point the issue first (wishful thinking) but don't believe anything they say.