Originally Posted by Patchwork
Any idea how much or where to find a replacement line? And I do have hydrologic brakes it is hard to start but once it starts it starts up fine and no power you can hear the turbo start to spool up .... but only a few seconds then nothing 65mph top speed petal to the floor when it's always been 75 if I try goin over a overpass I'll drop from 65 to 55-50.....
Then the third line should be a brake line leading to the rear wheels, which should be easy to trace back to verify.
You could try going to the chassis manufacturer, but a lot of this tends to be custom made. Building or repairing your existing line is likely more practical and cheaper. Swapping to "Pushlock" hose is another possibility, it's a popular choice for those doing major fuel system upgrades to their pickups. I've used it to replace my feed line to my 97 F250 as part of an electric fuel pump conversion.
If you suspect a boost problem, you could rig up a boost gauge and go for a drive. You'll have barely any boost at idle, it'll only make significant amounts at high load and maybe only a few psi at cruise. The turbo's ability to make boost is going to be determined by how strong the exhaust gases are moving. If the engine is already running poorly from another condition it'll affect the boost as the exhaust gases won't be as strong. Exhaust manifold leaks will likewise reduce the pressure driving the turbo and a restricted or pinched exhaust can choke the engine.
Also make sure you have no air leaks in the intake piping, even a small leak will rob considerable power. Depending on the size of the leak it may be audible as a hiss. You could have an assistant rev the engine for you as you look for leaks. You may need to manually apply air pressure or smoke to the piping to find leaks.
You said you overhauled the engine, was this low power issue present before you did so?