Took my car to a garage last week to have a new leak off pipe, bought it home and it's leaking diesel everywhere, fitted a brand new one and no leaks now from around injectors BUT after starting the car there's fuel leaking from underneath near the manifold, i have checked everywhere, I cannot see anything from the top of the engine and it has me stumped, I've checked the fuel lines and cannot see anything from there, any advice? Cheers!

Suspicious that this has happened since someone else (?) has been working on it, what did they do, why did you have to do further work?

What else was done, could it still be residual after leak off pipe leak, filter housing (cracked, especially if worse when running and then stops, difficult to start?, HP fuel pump?

Remove undertray, wash engine down carefully, check pipework to vaporiser , but further back, otherwise, I'm as lost as you are!

He was supposed to change the leak off pipe be to honest I don't think he did because the following day I noticed fuel around the injectors and a bit of diesel on the floor thinking jt was coming from there, I changed the pipe and noticed the leak off pipe was snapped completely like he broke it and pushed it back in, its like there's not enough fuel getting to the engine, once it's started with easy start she runs beautifully, but then there's the leak everywhere, it's gone from dripping slightly to heavy in the last few days, towing it to the garage tomorrow to be put on the lift, trolley jack just isn't doing it

Yes, there's a serious leak somewhere probably something introduced during their work that needs action.
Let us know what the issue was, if anything is admitted?