Early CIS O-Ring Issues

More
15 Feb 2021 08:40 #21765 by joejabq
Now that I have gone through my '79's CIS system and that it seems to be running fairly well, I wanted to ask if others have reoccurring issues with the fuel distributor O-rings, particularly the two with the pressure regulator. Those two O-Rings appear to really take a beating.
CISFlowTech point to ethanol in the fuel.
I'm sure that's right and also lack of use that allows them to dry out.
I'm just wondering if people have any magic bullets, like a Viton O-Ring supplier!

Please Log in or Create an account to join the conversation.

More
22 Feb 2021 12:48 #21784 by joejabq
Replied by joejabq on topic Early CIS O-Ring Issues

Now that I have gone through my '79's CIS system and that it seems to be running fairly well, I wanted to ask if others have reoccurring issues with the fuel distributor O-rings, particularly the two with the pressure regulator. Those two O-Rings appear to really take a beating.
CISFlowTech point to ethanol in the fuel.
I'm sure that's right and also lack of use that allows them to dry out.
I'm just wondering if people have any magic bullets, like a Viton O-Ring supplier!


After consulting with Rich and others with early model year cars, I’m now thinking that 10% ethanol is not an issue. I’m starting to think that letting the o-rings dry out, either from lack of use or having a system that doesn’t retain residual fuel pressure (I had both of these) is the more important factor.

Please Log in or Create an account to join the conversation.

Moderators: Rich928mm928billvvOC

Don't have an account yet? Register Now!