PTFE Fuel connections frustrations

[Junbug]

So I ordered all my fuel system connections and while starting the assembly today learned about 1/2 of the connectors I bought were wrong... I'm using all steel braided PTFE 6-AN lines, sticking with the same manufacturer, Fragola for connections and lines. My fuel pump has 3/8" male threaded ends on the supply and return. I somehow flipped the connectors when ordering and all of my female threaded ends are 6-AN (which fits the 3/8" male threads) but the opposite end pressure connections are 3/8", which are too small to fit over the 6-AN flexible pressure line. Looks like I'm going back to the drawing board and will see how returns work at Summit! Their filtering system doesn't specify which end is 6-AN and which is 3/8" just that there is one of each. I think I've found the right parts now but will have to wait another week to finish the system. Anyone else encounter similar issues?

[Papa]

Bryan,

I'm not sure I'm following what you're describing. Fuel lines are either AN or ORB (o-ring) fittings. The ORB fittings are typically used to thread into the EFI or pressure regulator. Most other connections will be AN unless you're using some form of a quick-connect. Do you have any pictures you can share?

Dave

[Junbug]

Dave,
Here is a photo of the connection in question. The red arrow points to the 6AN female threaded end of the connector. The red arrow points to to what I thought was a 6-AN connection for my 6-AN PTFE braided fuel line. The interior dimension of the opening of the yellow arrow connection is .375 inches, and the outer dimension of the PTFE 6 AN fuel line is .4 at minimum. I think the issue is I ordered said parts thinking the 3/8" threaded part was on the red arrow side and the 6-AN was on the yellow arrow side.
https://thefactoryfiveforum.com/attachment.php?attachmentid=181734&d=1679180717

This is a link to what I believe is the correct part... 6AN female and 6AN compression fitting for the 6AN fuel line.
https://www.summitracing.com/parts/fra-680106-bl

[Papa]

Dave,
Here is a photo of the connection in question. The red arrow points to the 6AN female threaded end of the connector. The red arrow points to to what I thought was a 6-AN connection for my 6-AN PTFE braided fuel line. The interior dimension of the opening of the yellow arrow connection is .375 inches, and the outer dimension of the PTFE 6 AN fuel line is .4 at minimum. I think the issue is I ordered said parts thinking the 3/8" threaded part was on the red arrow side and the 6-AN was on the yellow arrow side.
https://thefactoryfiveforum.com/attachment.php?attachmentid=181734&d=1679180717

This is a link to what I believe is the correct part... 6AN female and 6AN compression fitting for the 6AN fuel line.
https://www.summitracing.com/parts/fra-680106-bl

That connector is for adapting 3/8" hard tubing to a 6-AN female fitting. The piece with the yellow arrow goes on the 3/8" tubing with the threads facing the end. Then the compression sleeve goes on and finally, you mate the threads sandwiching the compression sleeve to form a seal on the hard line. The fitting in your link is correct for adapting 6-AN PTFE braided hose to a 6-AN female fitting.

[Junbug]

Thanks Dave! I appreciate your confirmation.
-Bryan

[Hoooper]

How do female threaded -6an threads fit 3/8" male threads? Sounds like you have some confusion going on. AN fittings dont fit x/x" threads, they only fit the matching size AN fitting unless its an adapter fitting. Sounds like you need an NPT to male AN adapter to bring your hose ends to. What does the fuel pump spec that you have say the threads are, 3/8" NPT?

[Junbug]

Thanks to Hoooper’s post above I went and reviewed the spec’s for my fuel pump hanger. It is a 6-AN male threaded end on a 3/8” hard line. This makes much more sense to me now, of course after I ordered the parts listed above. I actually sent those back to Summit today and ordered what I believe are the correct fittings! Parts should be here Thursday!
Thanks for all the advice and questions!