I will start by saying I bought this 2001 quad cab with a bad engine, swapped in a newer 4.7 and I am now troubleshooting a CEL. I cannot say the lines were correct when I got the truck. I am trying to eliminate a CEL with code 1494. I have replace the Leak Detection Pump, checked all hoses, and I am left thinking it is one of the following:

Purge Solenoid
LDP Filter
Vacuum lines incorrectly hooked up

When I check the FSM, I see that I should have a line running from the Purge Solenoid into the intake.

Anyone able to clarify what the FSM is showing with pictures of what lines should run where?

I currently have 2 lines leaving the canister. one is about 3/4" and one is a smaller line.

The smaller line runs directly to the throttle body. The 3/4" runs to the LDP. From there, one small line runs from the LDP to a Y, and then both of those lines from the split run into the purge solenoid. A 3/4" line also runs from the LDP to the LDP Filter.

I have a feeling something is hooked up wrong, but what? Thanks.

 

The purge solenoid will have a vac line and one to the canister. It should be marked on the side of it by the ports. A lot of people put them in upside down sometimes. Even me.