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The 61-62 JG states that the fuel vent hose is smooth,the parts suppiers sale ribbed hose as correct. I've got to believe the JG,(or should I?) will vacumn hose work with the gas vapors? Thanks Terry
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Re: C-1 fuel vent hose
My 2 cents
I cannot speak for others who may have also offered this part as a repro. However, when I first made that part nearly 2 decades ago, I used my old 1959 as the authority. That was a hose with one raised ribs. I then extrapolated to other GM model years that used the same assigned GM part number (57-62) as I cheerfully parted out many an old car. Probably not that scientific as this was not the nitpicking group that has emerged via these tomes. We used the GM SAE spec for a fuel resistant rubber.
Can you use vacuum hose for fuel hose? You can do anything you want, however there are different SAE specs for each of these different hosers. Rubber that is not the right spec swells and breaks down when exposed to gasoline. However, if you are building one by the book, then follow the book.
Geoffrey Coenen
PS I really think half of the info in these tomes is based upon as limited experience as mine and I probably have not seen one percent of production. -
other surface factors besides ribs – I’ll explain
When an extrusion die is manufactured, often it has more than one cavity. When multiple cavities are produced in one of these dies for round ID and OD products, often the adjacent round cavities in the die actually touch. Therefore when the hoses are extruded they are all attached like a bar of licorice. When you peel off one piece there is a trace of a rib like surface detail where it was attached to the adjacent piece. If I remember correctly, we purchased a 12 cavity extrusion die for this part.
If you have ever purchased hoses from FLAPS, you will notice most if not all of their product offering lacks any ID, such as ribs. In my limited experience most OEM’s used ribs for ID, however there are exception. Often then, they used different colored yarns in the cloth insertion for their ID. Wonder when the good book will add those colors parameters into the manuals. I’m not making this up. Some have 3 colors, others 4 colors. How specific can we get?
Geoffrey CoenenComment
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Re: other surface factors besides ribs – I’ll expl
Ribs on a rubber hoes is the identification of the company that supplied GM ,Like logos you see on other parts.
That is the reason the same part may have a different logo on it so that GM would know which company produced it .
Same thing on a casted part where you see the marking (GM 1 or GM12) that is so GM would again know which casting that part came out of.Comment
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