 CIS Question, Dist - Which is the supply and which is the return? |
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| Root_Werks |
 Mar 28 2022, 03:37 PM
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#1
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Village Idiot  Group: Members Posts: 8,337 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest 
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My memory really sucks and I'm not finding a good picture to reference.
I thought it was larger port was supply and smaller port was return. See my picture below. It's a 1974 CIS. Attached thumbnail(s) 
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| porschetub |
Mar 28 2022, 04:24 PM
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#2
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(Root_Werks @ Mar 29 2022, 10:37 AM)  My memory really sucks and I'm not finding a good picture to reference. I thought it was larger port was supply and smaller port was return. See my picture below. It's a 1974 CIS. The top cover of the Bosch fuel distributor normally has directional arrows cast into it indicating inlet and return. Good luck. |
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| Root_Werks |
Mar 28 2022, 04:57 PM
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#3
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Village Idiot Group: Members Posts: 8,337 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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QUOTE(porschetub @ Mar 28 2022, 03:24 PM) QUOTE(Root_Werks @ Mar 29 2022, 10:37 AM) My memory really sucks and I'm not finding a good picture to reference. I thought it was larger port was supply and smaller port was return. See my picture below. It's a 1974 CIS. The top cover of the Bosch fuel distributor normally has directional arrows cast into it indicating inlet and return. Good luck. Ah ha! Time to get out my little mirror on a stick. Thanks! |
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| Root_Werks |
Mar 28 2022, 05:14 PM
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#4
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Village Idiot Group: Members Posts: 8,337 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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No arrows, even looking at used units on eBay etc.
I think I may have my supply/return reversed, this is how it's plumbed currently. From what I can sort of tell on fuel diagrams, looks like the regulator is at the return hose side. Anyone that can help confirm would be appreciated. Attached image(s) 
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| Dion |
Mar 28 2022, 07:12 PM
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#5
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RN Group: Members Posts: 2,767 Joined: 16-September 04 From: Audubon,PA Member No.: 2,766 Region Association: MidAtlantic Region 
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Hopefully this can help
Attached image(s)  
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| Dion |
Mar 28 2022, 07:23 PM
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#6
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RN Group: Members Posts: 2,767 Joined: 16-September 04 From: Audubon,PA Member No.: 2,766 Region Association: MidAtlantic Region
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Mind you Dan, my CIS on my 4 cylinder had markings of the “triangle”‘arrow cast into like this one. Not sure if it exists on your version. They do vary obviously.
Attached image(s) 
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| Root_Werks |
Mar 28 2022, 07:55 PM
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#7
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Village Idiot Group: Members Posts: 8,337 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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Yes, learning they all vary a bit. I did have mine reversed. The fuel pump didn't sound right when pressured up and the "return" side didn't have any pressure. Swapped them around and let the pump run and things circ. Sounded normal.
The pressure reg on the distributor is the exit or return. |
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| Front yard mechanic |
Mar 28 2022, 08:37 PM
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#8
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Senior Member Group: Members Posts: 1,172 Joined: 23-July 15 From: New Mexico Member No.: 18,984 Region Association: None
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Lousy pic but maybe of some help
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