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Published on Feb 15, 2011
This is the procedure for checking for an internal fuel leak on your 1st gen GM 4.3V6 with the CPI engine in it. This is my 93 Blazer in the test. Fuel Pressure should be 58-62 psi, and it should hold that pressure, and hold it when turned off as well. I have a leak inside my upper intake as I show you in the video. My engine sputters, and puffs out black smoke and drips raw fuel out the exhaust pipe when running. My exhaust stinks as well like rotten eggs.