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2011 Chevy Silverado 1500 Fuel Pressure Problem?
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Question
bassmaster
Does anyone know where the fuel pressure regulator is on a
2011 Chevy Silverado 1500 with the 4.8l V8? I ask this because I am experiencing
problems with my truck that lead me to thinking that the pressure regulator may
be bad. The truck is hard to start after it has sat for a while say overnight
or like 8 hours. Its seems it is worse when it is cold outside. The problem has
recently started occurring and has seemed to get worse. Once I go to crank the
car, it doesn’t crank the first time then the set cranking time is disabled so
you have to hold the key. The starter motor turns fine and then it finally
cranks then bogs down for a second at 200 rpm’s, then fires up to 1500 rpm’s
like it should. It idles rough for about 15 seconds before it smooth’s out. You
can see the antenna shake when it does that. Once it cranks you have to step on
the gas petal to keep it from stalling. If you try to put it in reverse quick
it will stall. If you give it gas while it is cranking it seems to crank
easier. After that it runs perfectly
fine. It does not do it when the engine is hot, nor does it idle rough when it
is hot. So that is what leads me to thinking that the pressure is leaking out
of the system because it acts as if there is no fuel there. I’ve had the
battery and starter checked so that eliminated that. I took it to the
dealership and they couldn’t figure out what was wrong. They hooked it up to their
diagnostic system and it couldn’t find anything wrong. No codes are showing up.
I let it set overnight there so a technician could crank it in the morning to
try to figure out the problem. They suggested that I have the throttle body
cleaned along with the fuel injectors and that might fix the problem, but they couldn’t
guarantee that. . They never checked anything with the fuel system. I guess
they didn’t think that was the cause? But it wasn’t doing it as bad then as it
is now. It didn’t stall then or not crank on the first try, just bog down when
they looked at it. If it were a sensor, I would think a code would show up. That’s
what makes me think there is something wrong with the fuel system. The truck doesn’t
act up once it cranks for the first time so I figured it wouldn’t be the fuel
pump. Is there any way of testing is the fuel pressure regulator is bad. Or do
these sound like symptoms of it. If so where is it located? I posed something a
couple weeks ago about it but this is it now. Here is a video of it having the
problem. At the end you can hear the engine finally crank and hear it “bog down.”
The first video is what it was doing when the dealer looked at it, and the
second is what it is doing now.
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