Carb Hose Specification

[240 in OZ]

Hello Members

I am trying to ascertain the correct/original specification for the hose that goes over the top of the carb body and terminates at the air cleaner. It is an air/vaccum hose.

I am assuming that vaccum type hose is correct for this area.

Is someone that has the correct original type Nissan hose still installed in this area able to measure both internal and external diameter of this hose for me. Length of both hoses (ie front and rear) would also be appreciated.

Would someone be able to supply a genuine Nissan part number for this hose?

Thanks for any reply.

Regards

Joseph

[seerex]

Hey I just looked at my engine and are the hoses that come from the carbs or come from the valve cover? There are two hoses from the carb which are overflow hoses another from the valve cover to recycle the fumes and then a 4th that runs from the fuel fume recycle thing mounted next to the air cleaners on the firewall, maybe yours is diffrent than the ones in the states, Can take pics of mine if might help

[240 in OZ]

I think they may be the overflow hoses? They may be used to run fuel into the air cleaner box if a back up occurs in the system.

Joseph

[seerex]

thats is what I was thinking as well, if so I think they are the 5/8 fuel line , just checked the garage because i just replaced all of those on my 72 recently and I thought i had some left over, but yes in case of overflow it takes the extra fuel and dumps it into the airbox, not sure if there is a nissan number for that, both of my local nissan dealers give me the dumb look when i ask for things like that

[seerex]

roflol no i think 5/8 is a tad too big , sorry my mistake

[seerex]

just rechecked and they are 1/4 on my 71 and I believe those to be original

[Bambikiller240]

Where EXACTLY do these hoses you are looking to identify start and end?

Do they start at the Carb Float bowls and go to the Air Cleaner?

Do they start at the Flow Guide Valve (on the inner fender below the coil) and go to the Air Cleaner?

In either case they are NOT vacuum hose, they are fuel/oil rated.

The hose from the Flow Guide Valve and from the Float Bowls to the Air cleaner are not available from Nissan (Chloe searched for over 2 months trying to get some for me)

The hoses were originally a METRIC sized hose (naturally), but 1/4" ID hose will work fine for the Float Bowl to Air Cleaner, but will not look OEM as Nissan used hoses that had much thinner wall thickness ( and no reinforcing cord) than what is available currently.

Sorry, I don't have my original hoses. They were so brittle from age that I couldn't use them, and Chloe couldn't find OEM stock, so I tossed them and used generic 1/4" modern hoses. I found OEM hose for the Flow Guide to Air Cleaner at a Junk Yard that wasn't in too bad of shape.