75 vapor return line

[Daniel H.]

What is the diameter of the charcoal vapor return steel line? The one I bought is 1/4". should this a 5/16" ?

[John S.]

Daniel, don’t have a ‘75 but here’s a shot from my ‘73 that might help you out. Pretty tough to get a photo or any measurements but I can confirm that the return line is 1/4” along the frame but the end up by the canister looks like it is expanded up to 5/16”. In the photo I slid back the clamp and the hose a bit to expose the end and it’s definitely expanded to a larger diameter. Hope the helps, perhaps someone else will chime in to confirm the same for ‘75. Let me know if you need any further information.

[Daniel H.]

Daniel, don’t have a ‘75 but here’s a shot from my ‘73 that might help you out. Pretty tough to get a photo or any measurements but I can confirm that the return line is 1/4” along the frame but the end up by the canister looks like it is expanded up to 5/16”. In the photo I slid back the clamp and the hose a bit to expose the end and it’s definitely expanded to a larger diameter. Hope the helps, perhaps someone else will chime in to confirm the same for ‘75. Let me know if you need any further information.

Hi John!
That's perfect! The end of the repo steel line does not expand like yours in your picture so the 5/16 rubber hose will not clamp tight to it. It does have a little bump but only measures .275 well short of 5/16. I purchase a piece of vinyl tubing 5/16 od x 1/4 ID and inserted it into the rubber hose and now I have a nice tight fit. Also, in the original rubber tubbing I found that there is a small blue plug about a 1/4 inch long with a tiny hole in it. I put that back in the new hose as well.