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Old 07-16-2017, 12:23 PM   #1
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Fuel Line Replacement - easy question?

I have a 42 ft GB trawler and need to replace a fuel line on my starboard engine because of a slow, drip leak of fuel. This is an 80' long line from my Racor primary to the lift pump. It's a "Shields" fuel line and is 1/4" with female connections on both ends.
My question is: are these connection fittings "standard" or is there a fitting spec type I need to make before ordering a new fuel line?
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Old 07-16-2017, 12:25 PM   #2
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80" long
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Old 07-16-2017, 12:40 PM   #3
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Greetings,
Mr. J. Can't say for sure BUT some fittings with the "groove" in the nut part are reverse thread. Might want to check that. Doesn't seem likely but you never know.
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Old 07-16-2017, 12:51 PM   #4
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If it's a lehman it might have British BSPP threads rather than NPT. They aren't compatible so check before ordering.
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Old 07-16-2017, 12:52 PM   #5
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Looks like a crimped on female flare fitting. The notch mark typically means that the fitting is universal for either 45 deg flare which is what would typically be used in a fuel system, or a JIC37 which would normally be used for hydraulics. In most sizes the threads are different between Jic 37 and flare so they can't be mismatched. But in 1/4" and 1/2" the threads are the same and you need to be real sure which fittings you are using or you will get an unreliable seal. A number of manufacturers make "universal" female fittings in 1/4" and 1/2" to work with either male.

Ideally you would take the old hose to a hose shop and have a new one made to match. They can positively identify what it is. You could also disconnect the end in the picture and carefully measure the male face angle. 45 for flare, amd 37 for JIC. But I'll warn you, it can be real hard to tell the difference. You could also remove that adapter and take that to the shop. That might be the easiest.
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Old 07-16-2017, 02:08 PM   #6
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Most truck parts and diesel shops can make new hoses to match. I'd take it into a nearby shop, like TT advises.
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Old 07-17-2017, 04:04 PM   #7
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Look for a number on the fitting. It is a number 6 or 8. A good hose shop can tell from the photo if it is 37 or 45 degree by the cut marks in the nut. A number 6 is 1/4" 8= 3/8" and so on.
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Old 07-17-2017, 04:10 PM   #8
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Dang, when I read 80'!!!
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Old 07-17-2017, 04:59 PM   #9
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Quote:
Originally Posted by vacser View Post
Look for a number on the fitting. It is a number 6 or 8. A good hose shop can tell from the photo if it is 37 or 45 degree by the cut marks in the nut. A number 6 is 1/4" 8= 3/8" and so on.
Close, but:

3AN = 3/16" Tube Size (Nominal OD)
4AN = 1/4" (4/16")
6AN = 3/8" (6/16")
8AN = 1/2" (8/16")
Etc.
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Old 07-17-2017, 11:08 PM   #10
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Quote:
Originally Posted by LarryM View Post
Close, but:

3AN = 3/16" Tube Size (Nominal OD)
4AN = 1/4" (4/16")
6AN = 3/8" (6/16")
8AN = 1/2" (8/16")
Etc.

Right. The numbering system is based on 1/16". So #4 is 4/16", or 1/4". #8 is 8/16" or 1/2". etc.
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