I'm currently using Torque Pro and exported my ECU log below. I've been getting the check engine/fuel cap lights sometimes together (currently) and sometimes apart for approximately the past 9 months. While moving and having a baby I haven't gotten around to fixing it, sometimes I'd clear the faults and I finally went out and purchased a new OEM fuel cap from Amazon.com, that still didn't fix the issue.

I currently live in a townhouse which 'forbids' working on the truck outdoors, since it's winter I don't really have a place to work on it nor have I found any trustworthy mechanics in the area (Harrisburg, PA/west shore) yet, so I thought I would ask on here to see what users thought the next step(s) should be. Thanks in advance!

Current Fault Log
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P0455: Evaporative Emission Control System Leak Detected (gross leak, check fuel cap, piping etc)
P0457: Evaporative Emission Control System Leak Detected (fuel cap loose/off)

 

Generally these are caused by Fuel Filler tube with a crack.

Get a short hose and rag
Remove fuel cap
Put hose into tank opening and wrap rag around it to seal it
Blow into the hose
Tank should hold pressure if there are no leaks

Don't use air compressor for this, you will blow off fittings
Lungs can generate 2psi max which is enough to test the seals

You may be able to hear air escaping if it is filler tube

Also pop the hood and have someone listen for escaping air at/near the charcoal canister on the rad support

EVAP system hoses should be like this

Intake manifold-------------EVAP solenoid------(pressure sensor)Canister------------------------------------------------Fuel tank---filler tube---gas cap

EVAP solenoid is controlled by the computer, after engine is started computer will open solenoid a bit to pull gasoline vapors from the fuel tank, so tank will have a negative pressure.
The Pressure Sensor can be at the canister or at the tank, they moved it around, but it tells the computer if system is Sealed, i.e. holds a vacuum
Pressure sensors can fail but that is most often a different code number

When engine is off EVAP solenoid is closed so system is sealed, this is why you often hear a whooshing noise when you open the gas cap to fill up.
Although if your system is no longer sealed you may not have heard that for awhile, lol.

 

Thanks, I'll check into a cheap hose I can destroy, right now all that I can think of to fit the bill is in storage... it's rough

That makes sense if it's the case, is it something I can replace relatively easily or smart enough (with an infant at home) to take it to a shop and tell them exactly what needs to be replaced... wonder what that should/would run.

 

You need some specific tools and help of a friend
You need to remove the 6 screws that hold the bed to the frame, Torx heads
Then remove the 3 screws that hold filler hose to side of bed

If you leave in the two rear screws in the bed, but have them unscrewed most of the way, you can lift the front of the bed and prop it up with some "wood" or ??
But this does depend on your rear bumper setup

Or remove all the bed screws and disconnect tail light wiring
Then lift bed and slide it back to give you access to the top of the fuel tank

In a shop they have a lift so would put truck up in the air and then lower the fuel tank to get access to the top.
You can do this as well, on the ground, but it is a tight squeeze, and very very hard to get the gas tank back up in place while trying to get the straps on again, lol.