EVAP canister purge valve?

At idle or deceleration, absolutely! Purge valve stuck open on these trucks all the time. Also, make sure the canister is not saturated with raw fuel. Here is the locations of the EVAP canister purge valve for each engine that came in the truck so you can replace it (diagrams below).

All vehicles

image WARNING: Always disconnect the battery ground cable at the battery when working on an evaporative emission (EVAP) system or fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.

Image WARNING: Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.

Disconnect the battery ground cable. For additional information, refer to Section 414-01.
Disconnect the Evaporative Emission (EVAP) canister purge valve electrical connector.
Disconnect the EVAP canister purge valve vapor tube quick connect coupling from the valve. For additional information, refer to Section 310-00.
Vehicles equipped with 4.6L (2V), 4.6L (3V) or 5.4L (3V) engine

Disconnect the EVAP canister purge valve hose-to-intake manifold quick connect coupling. For additional information, refer to Section 310-00.
Remove the EVAP canister purge valve from the bracket.
Vehicles equipped with 6.2L (2V) engine

Remove the 2 EVAP canister purge valve bolts and remove the valve.
Installation

Vehicles equipped with 6.2L (2V) engine

Install the EVAP canister purge valve and 2 bolts.
Tighten to 10 Nm (89 lb-in).
Vehicles equipped with 4.6L (2V), 4.6L (3V) or 5.4L (3V) engine

Install the EVAP canister purge valve on the bracket.
Connect the EVAP canister purge valve hose-to-intake manifold quick connect coupling. For additional information, refer to Section 310-00.
All vehicles

Connect the EVAP canister purge valve vapor tube quick connect coupling. For additional information, refer to Section 310-00.
Connect the EVAP canister purge valve electrical connector.
Connect the battery ground cable. For additional information, refer to Section 414-01.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Good morning.

The bracket needs to be replaced and the canister placed inside and mounted back on the body. It is for the EVAP system which controls vapors to the air. It has nothing to do with the fuel pump at all.

Did the check engine light come on?

Roy

There will be one hose that will not be attached to anything, it is a vent to atmosphere.

Roy

The bracket is required to protect the canister. I would get one at a junk yard.

Roy