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Old 09-03-2019, 07:21 PM   #1
rb92673
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Default 12 mm Fuel injection line

I upgraded to a Walbro HP pump in tank on my 85 740 and I want to upgrade the fuel line between the tank and the filter for high pressure. I can only find 1/2" for fuel injection and it slides onto the nipple on the tank without any friction. I am worried it will leak.

I have searched the Internets and also called Volvo, BMW, local auto parts, truck parts, repair shops and I am not finding anything 12mm or 7/16.

Any suggestions of somewhere I can order and receive ASAP?

Also, I am thinking of ditching the hard line between the tank and filter for less possible spots to leak, any problem with that?

This is a track only Lemons car.
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Old 09-03-2019, 08:13 PM   #2
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1/2" comes out to 12.7 mm. Make sure it's rated for the pressure you intend to run and that it's rated for fuel. Perhaps the hard line can be replaced with 5/16" or 3/8" hard line.
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Old 09-03-2019, 09:45 PM   #3
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Originally Posted by lummert View Post
1/2" comes out to 12.7 mm. Make sure it's rated for the pressure you intend to run and that it's rated for fuel. Perhaps the hard line can be replaced with 5/16" or 3/8" hard line.
The 1/2” hose I have is rated for 300 psi. It’s 12mm out of the gas tank
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Old 09-03-2019, 09:48 PM   #4
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https://www.belmetric.com/index.php?...xoC-EwQAvD_BwE
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Old 09-03-2019, 10:35 PM   #5
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I used 1/2" push lock hose for the entire feed, hose clamps and no leaky
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Old 09-03-2019, 11:24 PM   #6
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Originally Posted by hiperfauto View Post
Have you used this for fuel injection pressure? It says 150 PSI, but it also says SAE J30R7 which is not for fuel injection.
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Old 09-03-2019, 11:40 PM   #7
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Been running 1/2" Earls on mine for several years, with rail pressures as high as 80psi, running a single in-tank pump and straight E85. No issues at all, no leaks, just use GOOD hose clamps, not the cheap ****.
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Old 09-03-2019, 11:46 PM   #8
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Ok, I'll go try and find good hose clamps and give it a shot. Thanks for the replies.
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Old 09-04-2019, 12:21 AM   #9
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https://rover.ebay.com/rover/0/0/0?m...2F362665378734

This is what I use. It's the correct 12 mm hose for fuel injection.
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Old 09-04-2019, 01:00 AM   #10
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Old 09-04-2019, 01:10 PM   #11
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Quote:
Originally Posted by rb92673 View Post
Have you used this for fuel injection pressure? It says 150 PSI, but it also says SAE J30R7 which is not for fuel injection.
No, I haven't. I just saw that it was 12mm fuel hose rated for 150 psi but I suppose that could be a typo and should read 15.0 psi.
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Old 09-04-2019, 01:33 PM   #12
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Thanks for all the suggestions. I ordered some of the BMW 12mm line off ebay. Always a helpful community.
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Old 09-04-2019, 10:18 PM   #13
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Quote:
Originally Posted by hiperfauto View Post
No, I haven't. I just saw that it was 12mm fuel hose rated for 150 psi but I suppose that could be a typo and should read 15.0 psi.
Standard 1/2 inch fuel hose is rated at 25 psi.
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