Smoke test the system. You can buy a cheap smoke machine from Amazon and within a few minutes if there's any leaks then you find the problem if there's no leaks you have two choices. Trace it out for electrical issues or replace everything and then see what happens.
I'm about to replace everything thanks to the previous owner butchering all the lines under the truck.
Best to use to clean out an engine and after 3-4 OCI's go back to the HM Oils. People seem to think if the oil isn't Dexos approved then it's not a good oil. Dexos is just a certification GM requires and the oil companies have to pay for that certification. With the shortage of oils from the foreign countries a lot of Oil makers are having to remove the Dexos certification.
I've been under the truck several times but it still has the same original parts minus the tubes as the previous owner cut it all out and used cheap gas line hose and it is soft and any movement causes it to pinch or kink and stops vapors from moving through the system. Trying to find someone who installed the updated relocation kit and which one of those two they used. Prefer not to use rubber hose where it's not needed.
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