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Re: 99 Silverado Rough Start
The pump only runs for two seconds unless the truck is running. It sounds like a injector leaking down or a fuel pressure regulator to me. Sounds like its flooding itself and that is why it takes longer to start. Intake leaks on these trucks usually cause a loping idle when first started and fuel injector/regulator problems usually do the rough idle thing.
As the others suggested hook up a pressure gauge and see if it'll hold pressure for more than 5 minutes or so. Also pull the vacuum line off the regulator and turn the key on and/or start the truck n see if gas sprays or runs out. It wouldn't hurt to clean the injectors either.
Josh
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