Tube Nut 1/8 needed part # 288550

[Sailon1]

Greetings,

One of the tube nuts on the carb pick up tube is stripped. If anyone has suggestions for repair or replace I would appreciate the info. The pickup tube is brass, I believe, and runs from bottom of carb to the intake-tube is approximately 9 in long. I may need to purchase the pickup tube assembly which includes the tube and 2, 1/8 in nuts. 288549

Thanks,

Bo

[hanleyclifford]

That should be a hardware store item. or you could switch to compression fittings which at our operating pressures will be just fine.

[ndutton]

A complete replacement is available from Moyer Marine.

https://moyermarine.com/product/18-inch-scavenge-tube-for-late-model-carburetor-fcar_13_60-0/

If you're looking for just the nut, McMaster-Carr has them. Search for "1/8" flare nut". However, if going that way there are other considerations. For example:

1. If the flare nut is stripped, what about the condition of the male flare fitting it threads onto?
2. You'll have to cut the 1/8" copper tube to remove the old nut and install the new one and the tube re-flared. By then the tube may (read: will likely) be too short to reach between the manifold and the carburetor and you'll be searching for 1/8" copper tubing and if you find it, the minimum length might be laughable.
3. Finding a flaring tool for 1/8" tube may be challenging. The smallest size on mine is 3/16".
4. Do not be tempted to use a larger tube as a work-around for the foregoing. The scavenge tube is a designed and tolerable manifold vacuum leak managed by the very small diameter.

All of which is solved with a few mouse clicks on the MMI site and it's delivered to your door.

[Sailon1]

Thank you for the detailed advice. MM sent me replacement info-aftermarket parts-and I will order the tube system including the nuts. Yes, cutting and flaring could cause more issues.
Thanks again,
Bo

[joe_db]

I never could find those small fittings locally, I got mine from MM. I have the PCV valve on now and that kit came some extra fittings too.

[ndutton]

Thank you for the detailed advice. MM sent me replacement info-aftermarket parts-and I will order the tube system including the nuts. Yes, cutting and flaring could cause more issues.
Thanks again,
Bo

I think you made the right decision.