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New Carter Fuel Pump. Inlet, Outlet


Leo B
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Hi,
I bought new Carter Fuel Pump. New one has bigger outlet and inlet than original. What are correct Inlet / Oulet Fitting sizes? (both are same size). I measured female 0.441-0.447 ".
Is the correct 1/4 NPT?

Edit: From the very top female is 0.49" So have to be 1/4 NTP.
https://help.summitracing.com/app/answers/detail/a_id/4826/~/what-is-an-npt-fitting%3F

IMG_3126.JPG

Edited by Leo B
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Hello Leo,  Every mechanical fuel pump I have installed on cars prior to 1975 have always been NTP. It is a taper thread so use a good sealer like Loctite 567 and install it snug and it will be fine. Never use teflon tape on them.   Good luck, John C.

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I would have guessed that it was inverted flare. Lo and behold when I looked at some spares in the shop, they appear to be NPT. No seat to seal! OTOH, the fittings that go into the pump are inverted flare.

 

FWIW, I have had success using hylomar as a sealant.

Edited by 64studeavanti
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Thank you gentlemen. I see only way to solve this is to use 1/4 > 1/8 NPT Reducer adapter fitting + Loctite or Hylomar.  I have Out T-fitting (cross) and In L-fitting (elbow) from older Carter. All older fittings seems to be tapered and appears that a sealant has been added to them.

image_32876.jpg

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Here is a pic of the original Carter fuel pump off my '64 Commander 259, showing its brass fuel fittings.  I believe your car is an Avanti, so your fittings may be different.  I would suggest going to Studebaker International or Stephen Allen's (or others) for these brass fittings.  These, of course, are SAE (English units); We ain't had metric here in the wild West for very long.

 

--Dwight

 

1964 Commander 259 fuel pump (2).JPG

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