LOL WTF!
That's one hell of a bodge. Seems you've got two bolt-in-end-of-pipe problems. I've not looked at a valver engine bay for a couple of months, but IIRC it goes like this...The factory fuel rail has a connection at the o/s end and half way down. One is flow from the fuel pump and the other is return to the tank. The n/s end of the rail has a top-hat shaped one-piece fuel pressure regulator with internal channels that basically just plugs in the end of the rail. It's pretty small and simply diverts and excess fuel back down the top side of the rail (internally) to the return outlet half way down the rail. It also has its own rubber vacuum connection that comes from the smaller metal pipe under the one that goes round the front of the cam cover. So far so good.
When you plumb in an FSE 'Power Boost Valve' - which is essentially just a remote adjustable fuel pressure regulator - you replace the small factory regulator with an adapter with a 90 degree outlet. This adapter has no return channel within it, because it's just used to flow the fuel onwards to your new PBV remote regulator. Once it gets there it goes in one side of the PBV, and the return pipe comes out the other. The return pipe is then connected by a long fuel hose back to the factory return pipe. This is still plugged into the middle of the fuel rail, but obviously now there's no return flow through this, so it's unplugged from the rail, and connected with a joiner to your return pipe from the PBV. The factory vacuum hose is far too short so it's replaced with a longer piece that stretches to your new PBV location and plugged in the top. Simple LOL
There should be nothing with a bolt bodged into the end of it; all these pipes and hoses are necessary for correct running. To return everything back to normal, the following should have been done:
Remove PBV, its two fuel hoses and single vacuum hose.
Push factory return pipe back onto the middle of the fuel rail.
Remove PBV adapter and replace with factory 'top hat' regulator in end of rail.
Connect factory adapter back to vacuum using original short U-shaped hose or shorten PBV vacuum hose and use that.
Hope this helps.
