Carter Fuel pump fittings

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CRUZE 418

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Just replaced my fuel pump (Carter M6270)
That's what was in it, no one seems to make a stock one. It's a mechanical for a '69 Dart, small block with six-pack. Has anyone had a problem with fittings? I could not stop the fuel leaks. It seems like they are 1/2-20 threads, but there was a pipe nipple on the inlet. Then I looked at the old pump and saw that the previous pump had a set up sealer on the fittings, I guess they had the same issue. I'm guessing that they used Aviation Form a gasket, it sets up. I just JB Welded the outlet fitting in. The inlet sealed up with liquid teflon.
What was your solution if you have had the same issue?
 
I have run that pump on several cars over the years including my now 69 360 Dart. I’ve never had a sealing problem. But I-always ran a short section of rubber hose on the intake side and output to keep vibration down. I just use Teflon tape.
 
Looks like pipe fittings....? it may be 3/8-18NPT << likely a 1/4-18NPT, has a .540OD>>
b8065413-9e3d-4bbc-85c6-0e4e50b2da67-jpeg.jpg
 
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This is the outlet fitting, it's for a flare, 1/2 -20 thread.

1629507645881502831452.jpg


1629507686560821115139.jpg
 
The inlet and outlet on that pump are both 1/4" NPT.
 
Guess that's why the 1/2-20 leaked. Wonder what the factory pump was like, I have the factory six-pack fuel line from pump to carbs. The pump end is a flare.
 
Guess that's why the 1/2-20 leaked. Wonder what the factory pump was like, I have the factory six-pack fuel line from pump to carbs. The pump end is a flare.

The pump most likely had NPT to flare fittings for the lines.
 
. But I-always ran a short section of rubber hose on the intake side and output to keep vibration down
Is OP running hard line from the tube on the body to the inlet on the fuel pump?

That's asking for problems!
 
Yeah, could not find one at my hardware store. If my JBWeld fails to seal, I will just have to take it apart and run a tap for clean up. Then find the fitting.

Thanks everyone!
 
No, rubber hose from frame line to brass pipe nipple at the pump.
 
You do what you want, but there's no way in hell I'd leave the wrong fittings in there with JB Weld. Not only is it not impervious to gasoline, it'll vibrate loose and crack up and fall out. Not a good repair. Especially when a couple of very inexpensive fittings will fix it right. Just my opinion.
 
I will get it out of there and correct it. I have to move the car tonight , getting a driveway to the back garage started tomorrow. The Aviation form a gasket was in there for several years and it never leaked. When I get the fitting we'll getter done.
 
I will get it out of there and correct it. I have to move the car tonight , getting a driveway to the back garage started tomorrow. The Aviation form a gasket was in there for several years and it never leaked. When I get the fitting we'll getter done.

Of course, you do know, NPT threads do need sealer, even though they are a taper fit. "I" prefer RTV, but I'm sure the arguments will ensue, so use whatever you like. But use something.
 
I have Teflon paste, or liquid, not sure of the number. Permatex #80631.
Got the car moved, up and attum 700 am.
Getting too old for this! Keeps me moving though.
 
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I'd check the local Advance Auto Doorman rack. Take the tube with nut or equivalent with. They might surprise you.
 
Yes, I will hit all three of the majors if I have to, AutoZone, O'Reilly, Advance Auto, and CarQuest.
 
This seems like a great example of why EVERYBODY who fiddles with these cars should learn and obtain some basic knowledge of common, standard, "old school" US fittings. Pipe, inverted flare, SAE flare, JIC/AN flare, and be aware of "on the lookout" for getting metric various types slipped in there unawares.

Inverted flare is traditional fuel lines/ brake lines. They should never need sealer on the actual inverted flare. The end of an adapter which screws into a Carter pump is often pipe, which has no bottom seat, and DOES require appropriate sealer. But that can start an argument. I've used a LOT of different sealers, including liquid pipe dope, teflon tape, RTV and maybe a couple other things.

If you do and internet search you can easily find charts/ catalogs by manufacturers that show the thread sizes and types of fittings...............

https://www.parker.com/literature/F...ectors Group Static Files/G-BrassFittings.pdf

https://brasscatalog.com/pdf/Brass_color.pdf
 
Agreed. Only the pipe thread should have some type of sealer. I was under the gun yesterday to get the car moved. I have thought for some time that I have oil in my fuel, that's when I got caught in this fuel pump spin, couldn't find one for a '69, so went with this Carter mechanical Street/Race pump. I know, usually if a diaphragm goes it's fuel into the engine oil, so this issue seems backwards, I will find out soon enough.
I ordered this pump back in May I think, it showed up Wednesday. So when I was switching fittings I ran into this problem. Spent the better part of a day messing with it and thought that someone else jury rigged this the last time and now I have to.
I will have to undo that JBWeld fitting and go proper, but I will get it!
It's always something isn't it?
 
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