Vacuum hose colors? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 09-19-2022, 05:28 PM

I'm working on a 71 402/400TH with AC. Anyone know what the factory vacuum hose colors were for?

1. Transmission modulator to/from hardline. I believe they're solid black with ribs.

2. Vacuum advance line to/from hardline. I believe they're black with a white stripe and ribbed.

3. Intake manifold fitting to the vacuum reservoir canister.

4. Vacuum reservoir canister to the temp. control valve's #1 port. I believe it's solid black and ribbed.

5. *Temp. control valve to RH kick panel door actuator.

6. *Temp. control valve to upper cowl door actuator.

7. *Temp. control valve to heater water valve.

8. From carb. to air cleaner temp. sensor, and from sensor to the snorkel's diaphragm.

9. From carb. to choke diaphragm.

10. From carb. to charcoal can's "CARB" port. I believe it's black with a white stripe and ribbed.

*Note for this model the control valve's #2 port provides vacuum to the kick panel door, upper cowl door and water valve using two tees. The vacuum valve's #3 port for earlier models provides vacuum to the heater water valve.

Thank you

**71CHEVYSHORTBED402** · 09-21-2022, 01:21 AM

Yeah who knows or cares

I'd already installed the a/c vacuum controller hoses, wasn't doing it over anyway. Colored blind any how, couldn't tell you what color stripes they are. Picked those up as a kit someplace, they're not ribbed.

Say, Inline sells white striped 5/32" for less than the "white stripe & ribbed" rate, but I got ribbed on the cheap end, they may all be ribbed. I installed that from carb to vapor can. and the same for the vacuum advance. Finished the rest of the fuel & vapor system, happy with the way it turned out. Expensive hoses man, the 1/4" off the PVC tee is what I think is correct, EEC-PVC-fuel hose like the rest of the vapor hoses.

Ordered an NOS vacuum modulator hose, it's solid black ribbed. Senior moment resolved perhaps, the hoses I pulled from the A/C vacuum control were all solid black ribbed.

Seems to me the hoses pulled off my air cleaner were solid black ribbed. Heck for all I know all of it was solid black ribbed for these trucks

, though I've read white striped ribbed for 5/32"-ish.

09-19-2022, 05:28 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,123	Vacuum hose colors? I'm working on a 71 402/400TH with AC. Anyone know what the factory vacuum hose colors were for? 1. Transmission modulator to/from hardline. I believe they're solid black with ribs. 2. Vacuum advance line to/from hardline. I believe they're black with a white stripe and ribbed. 3. Intake manifold fitting to the vacuum reservoir canister. 4. Vacuum reservoir canister to the temp. control valve's #1 port. I believe it's solid black and ribbed. 5. Temp. control valve to RH kick panel door actuator. 6. Temp. control valve to upper cowl door actuator. 7. Temp. control valve to heater water valve. 8. From carb. to air cleaner temp. sensor, and from sensor to the snorkel's diaphragm. 9. From carb. to choke diaphragm. 10. From carb. to charcoal can's "CARB" port. I believe it's black with a white stripe and ribbed. Note for this model the control valve's #2 port provides vacuum to the kick panel door, upper cowl door and water valve using two tees. The vacuum valve's #3 port for earlier models provides vacuum to the heater water valve. Thank you __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

09-21-2022, 01:21 AM	#2
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,123	Re: Vacuum hose colors? Yeah who knows or cares I'd already installed the a/c vacuum controller hoses, wasn't doing it over anyway. Colored blind any how, couldn't tell you what color stripes they are. Picked those up as a kit someplace, they're not ribbed. Say, Inline sells white striped 5/32" for less than the "white stripe & ribbed" rate, but I got ribbed on the cheap end, they may all be ribbed. I installed that from carb to vapor can. and the same for the vacuum advance. Finished the rest of the fuel & vapor system, happy with the way it turned out. Expensive hoses man, the 1/4" off the PVC tee is what I think is correct, EEC-PVC-fuel hose like the rest of the vapor hoses. Ordered an NOS vacuum modulator hose, it's solid black ribbed. Senior moment resolved perhaps, the hoses I pulled from the A/C vacuum control were all solid black ribbed. Seems to me the hoses pulled off my air cleaner were solid black ribbed. Heck for all I know all of it was solid black ribbed for these trucks, though I've read white striped ribbed for 5/32"-ish. Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025



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