Hey guys need some help here. Looking for the correct fitting setup for the main fuel line going in to the carburetor on a Texas Skyways O-520F/T-S converison. The B-nut threads are 11/16"-16TPI. Overhaul shop decided to keep it. Post pictures of what you have. Thanks!

Respectfully, recommend checking B-nut threads again because my C180H fuel-hose B-nut has 0.750-16 (inch) threads, requiring a 7/8-inch wrench on the B-nut, and the carburetor elbow looks like this:



It is a unique elbow in that it reduces 1/2-inch x 37-degree flare tube/hose to 1/4-inch NPT. Part number AN816-7J straight fitting (stainless steel, from Genuine Aircraft Hardware) is the only similar fitting I could find with respect to the threads, but it sufficed with custom hose from Aircraft Spruce.

Another view:


If you source one and the conical portion is less-than-pristine, an AS4824-series conical seal should be considered.

So why can't the overhaul shop return it to you

Mapleflt wrote:So why can't the overhaul shop return it to you

Or get another from Texas Skyways?

Inquiring minds want to know....

MTV

Local Parker store should have that in 45 degree and straight. DENNY

Did you have any luck? I'm in the same boat, carb got ovehauled and the fitting is MIA. Cessna manual says AN915-2 but it doesnt look right

Here is a picture from my 180K with what I think is the correct fitting-----45 degree AN. The trick is to get that fitting tight and have it clocked right. Seems to me a straight out AN fitting and a 45 on the gas line would be a better setup.