Fuel T block fitting under car near rear driver wheel.. what size are the fittings? - LS1TECH

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Fuel T block fitting under car near rear driver wheel.. what size are the fittings?

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Old 04-12-2008, 12:26 AM   #1
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Question Fuel T block fitting under car near rear driver wheel.. what size are the fittings?

What is the thread size? I know the in and out are the same but the one that returns to the tank is a smaller size.

Thanks in advance.
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Old 04-12-2008, 02:38 PM   #2
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Heres a photo. I need to know the thread size of the circled fitting. I know some of you have plugged this with a cap... what size did you use?

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Old 04-12-2008, 02:41 PM   #3
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I was wondering the same thing.. I need to plug the one that comes from the fuel filter.. I know its not a 3/8 lol..
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Old 04-12-2008, 02:53 PM   #4
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Figured it out. I knew I had seen it plugged somewhere... its 1/4" NPT. I know the inlet and outlet size is different. I wouldnt mind knowing that size too for future reference.

Found it here.

Does anyone have a write up for this?
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Old 04-12-2008, 04:12 PM   #5
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Those are flare fittings that have straight threads.. not NPT, tapered threads. The threads are not used as a seal. There's an internal flare seat in the fitting, and 1 on the tube.
A good AP store will have the correct plugs.
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Old 12-14-2012, 12:15 AM   #6
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from anyone thats done this, does it matter if you use a 1/4" NPT or a 1/4 flare plug? as long as it doesnt leak either should work right?
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Old 12-14-2012, 07:19 AM   #7
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Question Maybe..

Quote:
Originally Posted by JoshuaGrooms83 View Post
from anyone thats done this, does it matter if you use a 1/4" NPT or a 1/4 flare plug? as long as it doesnt leak either should work right?
go ahead and try it. If you **** up the threads, by forcing a pipe plug into a fitting that requires straight threads, and it still leaks, what then??
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Old 12-14-2012, 07:22 AM   #8
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It's a metric o-ring fitting. Either 14mm or 16mm if memory serves me right. I found the answer a couple years ago somewhere in this section.
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Old 12-14-2012, 07:24 AM   #9
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Here it is, post#5.

Factory return line size plug?
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Old 12-14-2012, 12:34 PM   #10
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thank you very much, thats the anwser i needed
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