The Ford Barn

1931 flamingo · 11-14-2018, 05:49 PM

G'Evening
I need the thread size for 48 fuel pump input OR a source for a nipple (slip on hose) that will fit and not leak.
Car now running w/elec pump thru filter direct to the carbs.

Thanks in advance. More needs and questions coming

.
Paul in CT

Mart · 11-15-2018, 02:45 AM

1/2"-20.

Sometimes known as UNF.

Mart.

rockfla · 11-15-2018, 02:45 PM

IF you are talking about inlet's and outlet's on the fuel pump NFT is incorrect. It should be NPT for National Pipe Thread......Pipe threads are a tapered thread for "sealing".......NFT or National Fine Thread is a machine thread and will not "seal" when tightened!! I believe (if memory serves me) they are 1/4 NPT. 0r 1/4-18 NPT

Brian · 11-15-2018, 11:04 PM

I believe Mart has the correct info....the sealing is done via a ferrule that is inter poised between the special nut [1/2 UNF] and a machined seat in body of pump.
And there has been a recent post about repop fuel pumps having the seat machined too deep, which means that when the flexible fuel line is fully tightened, it cannot seat, consequently, it leaks.

51 MERC-CT · 11-16-2018, 01:20 AM

These are the spec's for the pump as provided by NAPA.--

1931 flamingo · 11-16-2018, 07:32 PM

Sponsored Links (Register now to hide all advertisements)

Thank you all.
Paul in CT

rich b · 11-17-2018, 08:54 AM

Seems like those "Ford nut" barb fittings used to be pretty common (when parts stores were actually parts stores); but the only ones I found lately are the fittings from Stromberg. They have a dealer network; but I got mine from Summit. https://www.summitracing.com/parts/sbc-9080k

11-14-2018, 05:49 PM	#1
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Thread Size G'Evening I need the thread size for 48 fuel pump input OR a source for a nipple (slip on hose) that will fit and not leak. Car now running w/elec pump thru filter direct to the carbs. Thanks in advance. More needs and questions coming . Paul in CT

11-15-2018, 02:45 AM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,752	Re: Thread Size 1/2"-20. Sometimes known as UNF. Mart.

11-15-2018, 02:45 PM	#3
rockfla Senior Member Join Date: Mar 2014 Location: Jacksonville FL Posts: 3,956	Re: Thread Size IF you are talking about inlet's and outlet's on the fuel pump NFT is incorrect. It should be NPT for National Pipe Thread......Pipe threads are a tapered thread for "sealing".......NFT or National Fine Thread is a machine thread and will not "seal" when tightened!! I believe (if memory serves me) they are 1/4 NPT. 0r 1/4-18 NPT

11-15-2018, 11:04 PM	#4
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,834	Re: Thread Size I believe Mart has the correct info....the sealing is done via a ferrule that is inter poised between the special nut [1/2 UNF] and a machined seat in body of pump. And there has been a recent post about repop fuel pumps having the seat machined too deep, which means that when the flexible fuel line is fully tightened, it cannot seat, consequently, it leaks. __________________ Unfortunately, two half wits don't make a whole wit!

11-16-2018, 07:32 PM	#6
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Thread Size Sponsored Links (Register now to hide all advertisements) Thank you all. Paul in CT

11-17-2018, 08:54 AM	#7
rich b Senior Member Join Date: May 2010 Location: Minnesota Posts: 1,826	Re: Thread Size Seems like those "Ford nut" barb fittings used to be pretty common (when parts stores were actually parts stores); but the only ones I found lately are the fittings from Stromberg. They have a dealer network; but I got mine from Summit. https://www.summitracing.com/parts/sbc-9080k