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SX/Buschur/Switzer AFPR fuel fitting size?

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talon77

15+ Year Contributor
254
100
Sep 12, 2004
annapolis, Maryland
I have one of the old AFPRs that I bought from Tym Switzer a looong time ago that directly bolts onto the fuel rail. It came with a barbed fitting for a 5/16" fuel hose that runs to the stock 5/16" metal hard return line. I would like to replace the barbed fitting with AN fittings and braided hose to connect to a GM (Continental) Flex Fuel sensor, but I have no idea what size AN fittings/hoses to buy. Would anyone happen to know what size AN fittings fit this AFPR body? Below is a link for the AFPR that I'm talking about:

https://www.dsmparts.com/customer/product.php?productid=804&cat=121&page=

Thanks
 
Take the fitting off, and take it to ACE and find whatever thread size/pitch female fastener it threads in, then search for an army navy adapter fitting to whatever AN size you want.
 
I emailed Tym Switzer today and he recalled it being -6AN, but I think I will remove and double check to be sure. Thanks!
Remember the barb fitting original to that regulator is not an Army Navy threaded fitting, you need an Army Navy -6 adapter to the thread pitch inside the regulator. RTM Racing sells a kit noting the standard AFPR fittings are -6 or -8 Oring boss (-6ORB) fittings.
 
Just wanted to close the loop on this, for anyone who references it in the future. The fitting that came on the Switzer/Buschur AFPR was definitely -6ORB (O-Ring Boss). Here is a picture of it. Good call @Tiki2777
 

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  • AFPR Return Fitting -6AN ORB.JPG
    AFPR Return Fitting -6AN ORB.JPG
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