Where it says vacuum hose
Look on the underhood sticker.
No
Floor's rusting out, gas tank rusting, fuel filler hose is rusting. The fuel filler hose runs >inside< the van by the rear tire.
A vacuum hose routing diagram for a 1988 E 150 van can be found in the vans service manual. The manual can be bought at most auto parts.
Ford puts most of their vacuum hose diagrams on the air filter housing cover.
Most all of the vacuum lines will start from the intake manifold in the rear..........
small vacuum hose in engine compartment is cracked
under the dash on the passenger side
facing the van, to the top front left of block, rear of alternator & top radiator hose to block near thermostat housing, and to the left of IP.
You can find a complete vacuum hose diagram for your 1994 GMC Safari van in a Chilton or Haynes automobile repair manual. These manuals can be found at most local libraries or purchased at automobile parts stores. These companies also have online resources available for certain make and model vehicles.
Probably bottom of radiator or rear lower section--may be hidden by radiator hose