O6 tahoe,5.3 2wd.200,000 miles creme puff.started shutting off then not cranking.sometimes it'll run 2 weeks without a problem.sometimes 20 minutes.changed fuel pump.crank case sensor and pigtail.
Do a bleed down test on the fuel system with a fuel pressure gauge. Let her build up with pressure, should be 56 to 63 lbs, so what ever it builds up to turn the key off and let it sit for 3 min.The pressure should not drop more than 5 lbs.
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