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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 Find the service valve port and depressurize. In this article i'll show you how.

A leaking fuel injector can cause an array of problems for your gmc sierra Residual pressure test this is another method how to check for leaking fuel injectors When the injector doesn't close properly, excess fuel may enter the combustion chamber, creating a strong fuel odor and potentially wasting fuel.

The tester will perform all of the tests automatically and display results of the test.

This allows the truck to crank over without injecting fuel to start The injectors that are stuck open will still allow fuel to enter the cylinder This fuel will spray out the glowplug hole All this test will do is show you which injectors may be sticking

You may see the glowplug saturated when you remove it. 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. If its a clogged or dirty fuel injector the problem will be there all the time while driving or start up ect 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

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