Fuel pressure

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.

I have a 1997 Chevy blaze and just put a new fuel pump in it. The pressure when it’s running is 115lbs and the return line is clear but fuel won’t return back to the fuel tank. What is wrong with it

I have a 2001 Cheryl silverado. I have change fuel pump, regulator, Filter, cap, rotor, plugs and wires.. it still won't start, for it to start I have put fuel down the thuttle body... That the only way it start and runs