Hi,

I have a 1970 250C with Zenith carbs. On the first carb (front of car), right below the fuel return valve, is a fuel line. The fuel line connects to a copper tube leading up into the carb. Mine came loose & a small plastic ring came out with it.

Does anyone know what these parts are called? They don't seem to be listed in the Zenith parts identification page on Jaimekop.com or in my Haynes manual.

Now my fuel line leaks a little whereas before it was fine. I've tightened the clamp as much as I think I can without crushing the fuel line or the copper tube inside it. Did I break something or just put everything back together wrong?

Any help would be greatly appreciated!

Thanks,
- Wil

The return valve has a banjo fitting for the return line. It should feed back to the tank.

Other than the fuel supply line into the front carb that tee's to the 2nd carb, there should be no other fuel lines going to the carbs.

Can you post a picture?

Thx -CTH

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Hi,

Thanks for the response!

Here are some pics...

In the 1st one, you can see it under the carb.
The 2nd is from the passenger side.
The 3rd is with the fuel line & fitting removed from under the carb.
The 4th & 5th are the 2 parts I'm wondering about:

How do they go together? It seems like the plastic "grommet" should form a tight seal around the "bulbous" end of the brass tube and hold it in the carb. It doesn't & I'm not sure if that's just because it's worn out or if I'm just completely wrong about how it works.

The fuel line in question does not connect to the fuel pump, it appears to run to the tank.

Thanks again!

- Wil

Attached Thumbnails

         

There is nothing like that on my 67-vintage zeniths or the newer parts carbs I got off ebay. It looks like some kind of plastic check valve or something, although both of mine also don't have that triangular attachment point on the side either, so maybe it's a 70's emissions thing? When I see plastic stuff I tend to think aftermarket though, most of the original fuel line parts on my car are metal.

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1967 230S automatic
Boston, MA

i have 65/ 67/70/ models and all have zenith carbs.
NONE of them have the attachment as in photograph. Is it a variation of the fuel return damper which shuts of the fuel return at high speed.? if the pipe flow from the device is to rteturn tank then it is the variation of the return damper.

mak

Thanks, everybody, for your help.

It looks like I was right in thinking that the plastic fitting is designed to hold the brass tube in the carb.

I put the flanged end of the brass tube in the fuel return hose, clamped it, put the plastic fitting on top of that, & put the straight end of the tube in the carb.

The plastic fitting is shaped like a bowl & kind of "clips" onto the carb & holds the brass tube inside it.

The 3rd picture I posted above would seem to be the correct configuration.

Then again, I could be wrong.

We'll see...

That triangle of holes makes it a 1972 US zenith. Not that I can remember any of the details in the manual about them. The factory manual has a really bad photo of what's there.

The location of that hose is indeed where the fuel return line should be. The idea being that the fuel pump should be constantly supplying fuel, much of which isn't actually needed. This helps keep the fuel from getting hot and forming bubbles (vapor lock).

The zenith config that everybody seems to be familar with has a disk shaped return valve that is activated by a metal finger on the linkage. The valve is only open while idling.

-CTH

__________________
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http://www.111lakeside.com/

Aha, is this the Zenith with the calibrated fuel return orifice instead of the valve? I've heard the late ones had those instead. What's the triangle for?

The Zeniths sure have some odd, seemingly useless castings on them, such as that area that looks like a secondary accel pump well. I think they were trying to plan for future expansion or something.

__________________
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1967 230S automatic
Boston, MA