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Posted by: Root_Werks Mar 28 2022, 03:37 PM

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.




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Posted by: porschetub Mar 28 2022, 04:24 PM

QUOTE(Root_Werks @ Mar 29 2022, 10:37 AM)

Posted by: Root_Werks Mar 28 2022, 04:57 PM

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.

Posted by: Root_Werks Mar 28 2022, 05:14 PM

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.




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Posted by: Dion Mar 28 2022, 07:12 PM

Hopefully this can help


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Posted by: Dion Mar 28 2022, 07:23 PM

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.


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Posted by: Root_Werks Mar 28 2022, 07:55 PM

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.

Posted by: Front yard mechanic Mar 28 2022, 08:37 PM

Lousy pic but maybe of some help