95 Blazer wont start

[old_master]

There is a problem with fuel delivery. Leakdown is ok, which means the there are no leaks in the plenum, the fuel pump check valve, or any of the lines from the pump to the outlet of the regulator. Next step is determine if the pump is weak or the fuel pressure regulator is set too low, (not adjustable). The fuel return line needs to be restricted to allow the pump to build pressure beyond what the regulator will normally allow. DO NOT allow fuel pressure to rise above 75psi or damage to the regulator can occur.

[1990blackgt]

Originally Posted by old_master

There is a problem with fuel delivery. Leakdown is ok, which means the there are no leaks in the plenum, the fuel pump check valve, or any of the lines from the pump to the outlet of the regulator. Next step is determine if the pump is weak or the fuel pressure regulator is set too low, (not adjustable). The fuel return line needs to be restricted to allow the pump to build pressure beyond what the regulator will normally allow. DO NOT allow fuel pressure to rise above 75psi or damage to the regulator can occur.

How and where do I install a 5/16” shut off valve in the fuel return line

[old_master]

Anywhere between where the return line leaves the fuel pressure regulator at the intake manifold, back to the fuel tank. Some vehicles have a section of rubber line, you can restrict the flow there with pliers etc, but it's not nearly as accurate as using a valve.