Welcome back Chip

Its had most of the fuel lines replaced but will check this one again. There was an adjustable requlator near the external pump that has been by passed as its goosed. Its fitted after the pump and before the fuel rail, i assume this is just to set the max pressure to reach the rail, then the other reg takes over to adjust the fuel pressure under load?

Also if you leave the engine off but keep the pump running it sounds fine, so would this rule out the faulty pipe?

Bri.