fuel pump leak with 3/16 output

[gottagettamopar]

I had a small leak on my fuel pump so decided to pull everything off in order to fit a length of hard line up the front of the block and tidy everything up.
This is what came off.
.

The adapter on the bottom of the picture was connected to the pump. It's a 3/8 x 24 fitting and has a 1/8 hole running through it. Seems a bit small bore to me.
What I don't understand is why the pump has a 3/8 x 24 outlet which I think will only allow a 3/16 OD hard line. This is on a 440.
A 5/16 OD hard line should have a 1/2 x 20 fitting.
Can anyone confirm the above?
I should be able to get an adapter to increase the output size for a 5/16 hard line but is the pump correct? It seems to run ok.
Thanks

 

[Meep-Meep]

There is a lot of confusing and odd stuff in that picture. For starters the oil pressure sender must be used as a fuel pressure sender for a specific inside the car gauge? Fine. Second, your bottom fitting is a standard 45 deg flare and not what is used on a fuel line. You want the inverted flare stuff (looks like big brake line). And third, the mech pump outlet (assuming you have a mech pump) should have a 1/4 or 3/8 pipe thread. You can certainly get an inverted flare fitting with the correct male pipe thread and a 5/16" flare line - even 3/8"

 

[gottagettamopar]

Thank you for replying.
So all fuel pump fittings are pipe thread which means I need a pipe fitting with 3/8 male pipe thread and 5/16 female flare fitting. That is 5/16 OD pipe?

 

[Meep-Meep]

Most mech pumps have a pipe thread but the size may not always be 3/8". I know pipe thread sizes by looking at them because I've been looking at them for many years, but if you are unsure you will need a sample to compare. One important distinction you need to know, and this is general information, is pipe sizes are measured on the ID and tube is measured on the OD. Pipe is somewhat a loose dimension too while a tube OD is pretty much spot on. Inverted flare sizes are held to a standard, and again, I know what a 5/16" flare is by looking at it, but if you don't you'll need a sample.

Just looking at your picture it appears (from all the way over here through a computer screen) that the fitting sizes, from bot to top, are: 45 deg flare fitting with 1/8" pipe. 1/8" - 1/4" pipe bushing. 1/4" pipe tee. 1/4" pipe elbow (street - combination of male and female pipe threads) or (1/4" male pipe with either a 1/4" or 5/16" flare). 1/4" or 5/16" inverted flare line. Use any of these 1/4" fittings to see if they fit into the pump. If so then get that pipe size (probably 1/4") with a 5/16" inverted flare.

 

[gottagettamopar]

Thanks again. I've pulled the pumps on both my cars and one has a 1/4 pipe thread and the other has a 5/16 flare.
Just need to find fittings now which is not that easy over here!

 

[Garys1969RR]

I would try to simplify the arrangement and go back to the way the factory put it together. Come off the pump with the factory steel fuel line, into a fuel filter, then into the carb. Each fitting you have there is a potential leak/trouble spot.