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Fuel line size
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holden05 Offline
#1 Posted : Monday, 5 July 2021 8:22:56 PM(UTC)
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Im replacing the joiner in the fuel line in the holden wb ute. Its the one on the chassis rail on drivers side. Is it 5/16 or 8mm?
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HK1837 Offline
#2 Posted : Monday, 5 July 2021 8:26:44 PM(UTC)
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5/16. Also called 8mm. There is less than 0.07mm difference between the two.
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holden05 Offline
#3 Posted : Monday, 5 July 2021 8:32:35 PM(UTC)
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Ive tried to use 5/16 and found it hard to push on and thought that
8mm might be easier
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Dr Terry Offline
#4 Posted : Tuesday, 6 July 2021 6:49:42 AM(UTC)
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AFAIK all hose manufacturers interchange 8mm with 5/16", as HK1837 has said there is less than 0.07mm or 2.5 thou difference.

When rubber hose is cold it can be difficult to push on. Either heat it up with some hot water or try something like silicone spray to make it easier to fit.

Dr Terry

Edited by user Tuesday, 6 July 2021 6:51:16 AM(UTC)  | Reason: Not specified

If at first you don't succeed, just call it Version 1.0
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Smitty2 on 6/07/2021(UTC)
HK1837 Offline
#5 Posted : Tuesday, 6 July 2021 8:15:07 AM(UTC)
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8mm is actually the smaller one.

That joint is a bugger to replace. The old one you cut off but it can be hard to slide it up one pipe then onto the other. Heat or lube as Dr Terry says.
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Dr Terry Offline
#6 Posted : Tuesday, 6 July 2021 4:52:53 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
8mm is actually the smaller one.


I beg to differ. 8mm = 0.3149" while 5/16"= 0.3125"= 7.938mm

To me it looks like 8mm is a fraction larger.

Dr Terry

If at first you don't succeed, just call it Version 1.0
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HK1837 Offline
#7 Posted : Tuesday, 6 July 2021 8:38:59 PM(UTC)
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You are right, not thinking straight. I did the calcs right and mixed it up afterwards! I don’t think you can buy one or the other easily. Most places seem to sell it as both.
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