Underhood vacum

BBB

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I am looking for a diagram or some pics of the vacum lines under the hood. From pump to cruise brakes and vacum canister etc. I have found for inside the truck hvac controls. But not the underhood stuff. Mine is missing and want to put it back like it should be
 

Olds64

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All of the accessories under the hood use vacuum off of the vacuum pump from the vacuum manifold above the passenger's side valve cover. Hopefully your manifold isn't damaged, I don't think it's reproduced.

The only ported vacuum our trucks have is the hose from the Vacuum Regulator Valve to the vacuum modulator on the C6 transmission.
 

BBB

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Its all just connected then? I am trying to sort it all out. When I connect cruise servo. It goes full throttle. Even if electrical is unplugged.
 

Clb

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Whatch driveing?
Put the trucks specs in your sig line so we can see it up front.
I have an 88 and 93 fsv to reference..
 

Olds64

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With a 92 OBS truck your brakes might be hydroboost. Is there a vacuum hose running to your master cylinder? Otherwise you are correct, all the accessories use vacuum pump vacuum (there's really no manifold or ported vacuum on our trucks). Plus with a 92 you'd have an E4OD if it's an automatic. They have a Fuel Injection Pump Lever (FIPL) on the side of the Injection Pump (IP). This is 100% electronic.
 

Clb

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Looks like as close as I can see....
From the vacuum pump to the vacuum tree, to the reservoir, to the servo, thru the servo to the dash ( trigger), hopefully it will help you out...
Ps this is from the 88 fsm, as I don't have the full set of 1993'
You must be registered for see images attach
 

rreegg

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Looks like as close as I can see....
From the vacuum pump to the vacuum tree, to the reservoir, to the servo, thru the servo to the dash ( trigger), hopefully it will help you out...
Ps this is from the 88 fsm, as I don't have the full set of 1993'
You must be registered for see images attach
Thanks, Super helpful!:hail
 

rreegg

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In case it's relevant for anyone here is Nick Pisca's diagram for the vac. manifold ports
 

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