I have a 97"Chevy blazer 4.3 that the pressure is
not at the 50psi it's holding at 40psi & won't start
up. I just replace the fuel pump & fuel regulator &
cap & rotor & now the fuel filter too . Need help.
The fuel pressure needs to be between 56 to 63 lbs. A dead head pressure is even higher. (just checking the fuel pump). The 4.3L is notorious for the injectors, spider lines, and the fuel regulator leaking. You do a fuel bleed down test, build up the pressure by cycling the key to build up pressure, with the key off watch the gauge and pressure should not drop more that 5 lbs in 3 minutes. If so the injectors, spider lines , and regulator need to be replaced as a unit in order to have long lasting results.
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