From 87 to 95 did not have them. You will have to crack the fuel line alittle to relieve fuel pressure.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.
21
It controls / regulates the fuel pressure.
That depends on what engine it has.
It is in the throttle body.
Engine oil pressure, cooling system pressure, ac pressure, fuel pressure?
The fuel pump is kaput.
Need engine size.
use a pressure guage hooked to the scrader port on the fuel line.
9 to 13 LBS. No more and no less.
the oil failed and made something wrong
In the low pressure service port, the smaller of the two.