1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

Assistance with 96 GMC 2500 vacuum routing

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Old Jan 12, 2022 | 11:44 AM
  #1  
FEandGoingBroke's Avatar
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From: Near Seattle
Default Assistance with 96 GMC 2500 vacuum routing

96 2500 with the 350. Passenger valve cove area. Missing two hoses or one hose with nobody to point the correct direction... This site apparently don't get much attention or traffic...

In the pic you see two solenoids, one get's vacuum from the upper plenum and is bolted to it with one nipple pointing toward passenger fender. The forward solenoid has Two nipples, one vacuum line going to vapor cannister, that nipple points toward the radiator, the other nipple points back toward the firewall and towards the other solenoid.

does anyone have a pic of this they can offer or a diagram that matches my friends solenoid? It was delievered with a vacuum line and a lot of things needed corrected. Are they simply supposed to go to each other?

ALL online diagrams and photos show a different style solenoid towards the front of the engine than the one this truck is sporting.


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Old Jul 4, 2024 | 10:47 AM
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Gsjdj's Avatar
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Default Same here


Same issue, pcv valve goes in the hole at the bottom then a hose goes up to air intake. Not sure if a T goes above the pcv so you can connect the little vacuum hose to it but thats what it looks like and i saw a T like that on rock auto. Any information you can share with me would be appreciatted if you figure anything out. I will post agian if i fix it.
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