Sounds like you have a bad fuel pump regulator if you dont have a regulator it might be the fuel pump that is going out It also sounds like a intake manifold gasket might be leaking Have you done a full tune up already I'll start with that first A leaking fuel injector can cause an array of problems for your gmc sierra When the injector doesn't close properly, excess fuel may enter the combustion chamber, creating a strong fuel odor and potentially wasting fuel.
Testing a leaking 'spider' fuel injector assembly or a leaking fuel pressure regulator (gm 4.3l, 5.0l, or 5.7l ) can seem impossible, since both of these bad boys are located inside the intake manifold's plenum but they can be tested and it's far easier than you think In this article i'll show you how. In this video i demonstrate how to check and test for bad fuel injectors I show how to conduct a power balance test, test with a noid light and test with a multimeter. Read on to learn how to check for leaking fuel injectors to ensure your engine runs optimally and prevent fire outbreaks from external injector leaks and vacuum leaks. Residual pressure test this is another method how to check for leaking fuel injectors
Find effective diy methods to test for a leaking fuel injector without a pressure gauge, including visual inspections, checking spark plugs, using an obd2 scanner, and more to diagnose the issue.
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