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Where is fuel filter
Should be on the receiver/drier.
Fuel pressure gauge hokked to port, gauge has a relief valve and hose to dump to a container. Can try pulling fuse for fuel pum, turn engine over for a period long enough to relieve most but not all the pressure.
in the fuel tank.
there are actually 3 fuses ( that i have found) 2 are in the fuse panel below and to the left of the steering column marked ac and auxilary ac/heat. my 1993 g3500 vandura also has an inline 20 amp fuse wired in between the fuse panel and the rear blower motor switch.
K3500 is a pickup truck; G3500 is a van.
The fuel pump is in the fuel tank. You will have to lower the tank to access it.
Answer to: Where to find the fuel filter for a 1994 GMC Vandura 2500? Try looking on the under carriage just below the driver's door. There you should find a 3" cannister on the fuel line.
Yes
There is not one.
inside fuel tank
If you're running a GM gas engine, about 40 psi. If you're running the 6.5 Detroit Diesel, 10 - 12 psi.