Take off the gas cap, look for a schroder valve on the fuel rail. If it has none then wrap the filter connection in a rag and be prepared for a sudden spray of fuel when you loosen the filter.
start the truck then while it running pull the fuse for the fuel pump and allow the truck to die then fuel line have no pressure
It controls / regulates the fuel pressure.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.
The typical fuel pump pressure for a 1997 Chevrolet CK 1500 truck is 50 psi. The high pressure is required to atomize the fuel when it leaves the injectors.
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The mechanical fuel pump regulates the fuel pressure. This truck is not fuel injected. It has a carburetor.
There is no button to release fuel pressure.
use a pressure guage hooked to the scrader port on the fuel line.
The fuel pump is kaput.
Fuel pressure? spark?
From 87 to 95 did not have them. You will have to crack the fuel line alittle to relieve fuel pressure.
It is part of the fuel pump module, in the tank.