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250 OEM mechanical fuel pump - outlet fitting connector type

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62Ranchero200
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250 OEM mechanical fuel pump - outlet fitting connector type

Post #1 by 62Ranchero200 » Mon Mar 30, 2020 6:24 pm

Greetings Ford Six Fans,

What is the correct specification for the 250 OEM mechanical fuel pump female threaded outlet?

I took the male fitting that was screwed into the fuel pump outlet to the hardware store to compare, it seems a lot like "1/4 NPT" but the threads also seem to be 1/2-20 (1/2", National Fine or NF).

I'm trying to determine what to order to make up a stainless brained fuel pump to carb line with -AN 6 connectors/adapters. The other end will screw into an adapter on my Holley 4412-S carb and looks to be the same size. Forgive me if my terminology is incorrect, this is my first time working with these type of fuel lines and fittings.

Thank you,
Bob
62 Ranchero, 252 cid, 300 rods, RaceTek pstns, ARP mains bolts & studs, balanced & blueprinted, CI AL head, 1.6 adj rckrs, Smith Bros, 274/274/108 cam, CI int, Holley 500, DSII, CI SS hdrs, PowerMaster strtr and 1wire alt, Optima, V8 rad, T-5z, 10" organic clutch, 5 lug 8" w/3.80 Trac Loc, rear drums, front 5 lug discs, Centerlines. Next: ?.

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chad
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mechanical fuel pump - outlet fitting - connector type

Post #2 by chad » Mon Mar 30, 2020 6:40 pm

AN is AN...isn't it - no 'like' threads. If so U must match them or havea lill adapter,,,
May B I don't getja. Gunna reread.
Yep...
just like course, fine, pipe. It's the "thread pitch", number per inch, etc
(U no: quarter 20, etc).
U think AN fittings R expensive, the lill adapters R even more.
So far I like ur idea tho~
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), '69 250ci, NV 3550 & DSII, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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bubba22349
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Re: 250 OEM mechanical fuel pump - outlet fitting connector type

Post #3 by bubba22349 » Mon Mar 30, 2020 7:22 pm

It should be a 1/4 NPT thread in the fuel pump. :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: 250 OEM mechanical fuel pump - outlet fitting connector type

Post #4 by wsa111 » Mon Mar 30, 2020 8:17 pm

Bob, Summit has all the adapters & AN fittings for a braided fuel hose.
Your heat is worse than mine & i found the mechanical fuel pump was heating the fuel into vapor lock.
Go electric fuel pump & pressure regulator. Your Holley should handle 6-7# pressure.
Did you ever find a dowel pin for your camshaft. If not give me a shout.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6425CL & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
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Econoline
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Re: 250 OEM mechanical fuel pump - outlet fitting connector type

Post #5 by Econoline » Tue Mar 31, 2020 12:14 am

The connection is for a 5/16" inverted flare tube and nut. It is a straight 1/2"-20 thread but it's a 5/16" inverted flare female connection.

If you want to go to AN you can find an adapter. Like Bubba said though, that connection may be an adapter already screwed into a 1/4" npt hole on the fuel pumps as they are sold with to connect to the oem 5/16 fuel line. It's been a while since I looked at mine but I bet that "connection" is screwed into the pump at the factory and is brass and can be taken out.
It ain't gonna fix itself

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