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A leaking fuel injector can cause an array of problems for your gmc sierra If it stabilizes then it could be a clogged or faulty injector. When the injector doesn't close properly, excess fuel may enter the combustion chamber, creating a strong fuel odor and potentially wasting fuel.

GMC Sierra Bad Fuel Injector: Symptoms, Diagnosis, How to Fix

If its a clogged or dirty fuel injector the problem will be there all the time while driving or start up ect (a) too much air not enough fuel = injectors (b) too much air not enough fuel = exhaust/intake leak (c) intake manifold crack or vacuum leak if you find no cracks or leaks i'd run a can of royal purple max clean through the fuel system then watch what your fuel trims do 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 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.

Check the fuel pressure regulator While the truck is off pull the vacuum line off and see if gas comes out of the vacuum line If gas comes out replace the fuel pressure regulator This is a common problem on almost all newer gm vehicles 96+

The spider injectors are in the older 96+ 4.3, 5.0, 5.7l motors not the 99+ 4.8, 5.3, 6.0

I have a 05 lly with 75,000 miles I have been smelling fuel for the last week but no drips on the ground until today I removed the inner wheel well on my driver side and traced the leak to around the top of my injector driverside closes to the rad Do i need to replace the injector