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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29586
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I jab a 04 Denali 6.0.. Just replaced the fuel pump.. Now after

Customer Question

I jab a 04 Denali 6.0.. Just replaced the fuel pump.. Now after fill up it starts hard and I have to cycle the key.. Thoughts .. Also fuel smell at back of the truck
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.
Hi there. Once you do get it running, how does it drive? Does it lack power? Does this only happen after filling it up?
Customer: replied 2 years ago.
Power is fine.. Only after fill up.. Mileage seem normal as well.. Sometimes throws code P0405
Expert:  GM Tech (Cam) replied 2 years ago.
This sounds like a problem with the evap system. Did you have any issues with the lines on the tank? Also at the engine, top centre of the intake is the purge valve. Can you unplug the electrical connector and see if the port out of it has vacuum on it with the engine running? If so then your purge valve is leaking and needs to be replaced.
Customer: replied 2 years ago.
I will check now.. Please hold
Customer: replied 2 years ago.
The blue electrical connector?
Customer: replied 2 years ago.
It appears to be no or very very limited vacuume.. Almost like its pushing air
Expert:  GM Tech (Cam) replied 2 years ago.
Two wire and very top centre with a black hose out of it that then runs down the drivers side of the intake.
Expert:  GM Tech (Cam) replied 2 years ago.
With the connector off and the engine running it should not have vacuum. With it plugged in it may have vacuum depending on what the computer is requesting.
Customer: replied 2 years ago.
No vaccum while running
Expert:  GM Tech (Cam) replied 2 years ago.
Does the pink wire have power?
Customer: replied 2 years ago.
Pink?
Expert:  GM Tech (Cam) replied 2 years ago.
Is there not a pink wire into it? If not what colours are there ?
Customer: replied 2 years ago.
Green and light green
Expert:  GM Tech (Cam) replied 2 years ago.
Do either have power all the time with the key on?
Customer: replied 2 years ago.
Shoot.. Test light broke.. Damn.. Guess will have to wait till morning
Expert:  GM Tech (Cam) replied 2 years ago.
In the mean time lets verify all the hoses to the vent valve, charcoal canister and such are clean, not pinched and not plugged.
Customer: replied 2 years ago.
Where is the canister ..by the gas tank I assume?
Expert:  GM Tech (Cam) replied 2 years ago.
Yes should be above the rear axle with three hoses going into it.
Customer: replied 2 years ago.
It's dark.. But I know where it is.. I'm going to take it in the am..
Expert:  GM Tech (Cam) replied 2 years ago.
Ok. Please be sure to save this page as a favorite in your web browser so you can reply back to me easily. you can reply at an time, even after accepting or rating me.
Customer: replied 2 years ago.
I will, thanks
Expert:  GM Tech (Cam) replied 2 years ago.
Ok.