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Unread 07-11-2010, 04:59 PM   #1
somdfisher
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1981 CJ7 
 
Join Date: Feb 2010
Location: Lusby, MD
Posts: 404
Fuel line question; need to know the size of the feed and return

Just need to know the size of the feed and return. 81 7 with 258. Thanks much.

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O|||||O 1981 CJ7, 258, 4 speed..If it ain't cut, it ain't custom.
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Unread 07-11-2010, 07:26 PM   #2
h2ojeep
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1978 CJ7 
 
Join Date: Oct 2008
Location: Cottonflat, TX
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The feed line is 5/16 ID coming out of the tank and also 5/16ID on the fuel pump, but the line in between is 3/8ID. The return line is 1/4ID at the tank and the line coming from the return on the filter is 5/16ID.
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Unread 07-11-2010, 09:18 PM   #3
Coiz
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1979 CJ7 
 
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My 1979 had 5/16" line feed from the tank to the engine on the passenger's side frame rail and 1/4" return line from the carb to the tank on the driver's side frame rail. The fuel vapor line up to the canister is also 5/16" and runs up the driver's side frame rail.
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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Unread 07-11-2010, 09:24 PM   #4
dslywalker
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1983 CJ7 
 
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You might check but if you decide to go electric fuel pump someday return line should be 5/16.Might save you some trouble later on.
Mike
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Unread 07-13-2010, 12:01 AM   #5
h2ojeep
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1978 CJ7 
 
Join Date: Oct 2008
Location: Cottonflat, TX
Posts: 677
Quote:
Originally Posted by h2ojeep View Post
The feed line is 5/16 ID coming out of the tank and also 5/16ID on the fuel pump, but the line in between is 3/8ID. The return line is 1/4ID at the tank and the line coming from the return on the filter is 5/16ID.
MY BAD

I have posted something that is NOT correct.

The line size are outside diameter, OD and NOT ID.

The feed line is 5/16 OD coming out of the tank and also 5/16 OD on the fuel pump, but the line in between is 3/8OD. The return line is 1/4OD at the tank and the line coming from the return on the filter is 5/16OD.

My apology.
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Unread 07-13-2010, 06:57 AM   #6
somdfisher
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1981 CJ7 
 
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Location: Lusby, MD
Posts: 404
It's all good, I appreciate the replies. If I went with 5/16 all around would I still be good?
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Unread 07-13-2010, 07:40 AM   #7
Coiz
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1979 CJ7 
 
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Location: Northern, IL
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Yes, 5/16" feed and return would be perfectly fine and actually preferred if you ever decided to switch to a fuel injection system.
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My build thread
1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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Unread 07-13-2010, 07:42 AM   #8
somdfisher
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1981 CJ7 
 
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Location: Lusby, MD
Posts: 404
Sweet, I'm picking up 25 foot of it today so I wanted to be sure. Thanks a lot.
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O|||||O 1981 CJ7, 258, 4 speed..If it ain't cut, it ain't custom.
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