SOURCE: 6.6 diesel LB7 oil
Derek.
it takes 10 quarts of oil in 15w40. I have the same year GMC and i have had no issues other than my carrier bearing went out today.
SOURCE: 1999 chevy blazer wont start
THE FUEL PUMP IS BAD.
if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.
and i doubt that you are seeing enough fuel pressure to run a vortec engine.
low fuel pressure equals a non running vortec
SOURCE: 2000 chevy express 5.0 2500 series starts,runs and
Try swapping out the fuel pump relay, if thats good try testing your ignition system components. Start with the module and coil pack. If they are ok check the crank position or cam position sensor (which ever applies).
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