There is only One way to install the Vacuum Shut Off Valve correctly on the
pump on the 2.5 5 Cyl.
AND the accused has already admitted to "Having the VSV Off the Pump".

Note: Being able to use the mechanical EMERGENCY shut off... DOES NOT MEAN
you've installed the VSV correctly!

DO NOT SCREW AROUND running this engine until you have POSITIVE proof
that you've installed the VSV correctly!!!

You have been exceedingly lucky (You have not had a "Runaway"...Yet!)

It will "Spool UP" much faster than you can stop it ...Don't even think about
using "Bolt Cutters" on the Injection Lines...By the time you've managed to
cut two ...It'll have "Launched" the #1 Rod...(Guess Where?).

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'84 300SD sold
124.128