this pic shows a vacuum hose routed by the injectors:
hard to see IF that hose is coming from the back of the tank as it should ..
or .. whether the bit of hose circled in yellow has been cut and blocked ..
or if the vacuum-tank has been bypassed .. not a good idea imho ..
this one appears to show a vacuum hose routed along the bulkhead
it looks to be the one from the back of the vacuum-tank for the turbo solenoid
.. in pic '2' ..
this is mine:
am fairly sure the hose just above the word "egr" ..
( as in "egr hose blocked" in green text )
is the hose exiting from the back of the vacuum tank ..
and runs over the engine .. by the injectors ..
then down to the turbo vacuum solenoid ..
can't be 100% sure on that as it's been a while since i had that injector cover off
( just going by memory .. cover was off 2 years ago ..
( but i wasn't searcing for vacuum hose routing at the time :-)
the haynes manual shows what Maybe a vacuum hose running by the injectors
anyhow .. what frays will be the cloth covering over the rubber tubing of the vacuum hose ( i think ) .. and i've no idea about what hose clips may .. or may not .. be under my injector cover ..
you could always do your own vacuum hose routing .. use cable-ties to secure it ..
and buffer the bits that rub against something .. with a bit of rubber or similar ..
( obviously avoiding engine bits that get very hot .. as opposed to just hot/warm :-)
as the engine vibrates .. especially at idle .. any hose or wiring ..
if not secured properly .. and protected against rubbing ..
will eventually wear thru ..
( for example .. the top left intercooler hose that is near one of the intake assembly securing screws )
btw: the haynes manual does show a set of clips that secure the turbo vacuum hose .. and some wiring
on the large pipe that goes from the maf housing down to the turbo air intake ..
i.e. the upper bit of that pipe that look to be plastic ...
( just going by the haynes photo .. not looked at it on my vehicle yet )