What is the best way to test if the fpr is working properlyon a 2000 4.3L. I believe it is the reason my blazer has trouble starting.
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Connect a fuel pressure gauge to the schraeder valve on the fuel inlet line above the engine, turn the ignition key to 'on' and the pressure should be ~51-62psi. Turn the key off and watch the gauge. The pressure should not drop more than ~2-3psi. If it does, you have a bad FPR. If the reading continues to drop over the next few minutes, you have a leak in the lines inside the upper manifold.

 

Thanks rriddle3. I guess I get to start tearing apart the upper manifold now.
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