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Old 02-12-2014, 04:09 PM
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Steel fuel line question with -an fittings

I have a fuel line I want to replace on a jeep with EFI. I have 20 ft of 3/8 steel tubing left over from another project and I want to buy -6 an tube nuts and sleeves to tie a couple things together. My question - Is it ok to use aluminum nuts and sleeves on steel tubing or should steel be used instead? I have seen some of the aluminum ones advertised to work on either aluminum or stainless steel, just curious what everyone thinks.
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Old 02-12-2014, 05:24 PM
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why dont you just use brass fittings?
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Old 02-12-2014, 06:23 PM
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I've got to tie into a fuel rail with 6 an, not sure there is such a thing as brass an fittings are there? Again, this is for an EFI system with a high pressure fuel pump.
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Old 02-12-2014, 08:35 PM
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you can get aluminum/plastic/copper/brass/steel adapters
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Old 02-12-2014, 09:03 PM
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Thanks for the input vinnie, but back to my original question.

Is it acceptable to use -an style aluminum tube nuts and sleeves on steel line for fuel injection setups?

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Old 02-12-2014, 09:47 PM
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The different metals might cause some corrosion problems.
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Old 02-13-2014, 12:37 AM
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Anytime you join two dissimiliar metals it will set up a chemical reaction and corrode. First thing i learnt while taking plumbing courses in college.
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Old 02-13-2014, 12:41 AM
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As long as the AL fittings are anodized corrosion will likely only occur long after the car has gone to the crusher, you can mix the fittings...its done on motorcycles all the time.

A little neverseize on the fitting prior to torquing down will ensure it comes apart later and will prevent any crevice corrosion where the fitting meets the line.

The problem is when you mix the other way, dont use steel fittings with AL line...AL preferentially corrodes in the galvanic scale which can cause a crevice corrosion crack notch where the fitting meets the AL line...not good.
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Old 02-13-2014, 04:49 AM
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I am running 1/2" steel lines on the van with steel to aluminum connectors. Here are a couple of links to the ones I am using.
The Yor_lok adapter I am using is this one.

McMaster-Carr


The -8 aluminum adapter I am using is this one:

Earl's AT981608 Earl's Ano-Tuff AN to NPT Adapter Fittings - Free Shipping on All Orders @ JEGS
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Old 02-13-2014, 05:16 AM
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if you can't do the correct flare. don't bother. it's not 45*
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Old 02-13-2014, 06:42 AM
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I have used annealed stainless tubing from McMaster and aluminum nuts and sleeves from Summit. The most important item you need is a 37 degree flaring tool. I have a Parker one and have been using it for years. I have done Jet Boats, Cars and bikes with no corrosion issues. You can also get the stainless nuts and sleeves from Mcmaster. Here is my EFI fuel rail set up for 8-71 Big block chevy where I made the injector plates and everything else.
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Old 02-13-2014, 09:41 AM
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37 degree flares are not going to be a problem, thanks for all the comments guys.
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Old 02-13-2014, 07:13 PM
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Quote:
Originally Posted by TJSBBC View Post
I have used annealed stainless tubing from McMaster and aluminum nuts and sleeves from Summit. The most important item you need is a 37 degree flaring tool. I have a Parker one and have been using it for years. I have done Jet Boats, Cars and bikes with no corrosion issues. You can also get the stainless nuts and sleeves from Mcmaster. Here is my EFI fuel rail set up for 8-71 Big block chevy where I made the injector plates and everything else.
Nice boat!!!!
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Old 02-14-2014, 01:46 PM
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4jawchuck neverseize
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Old 02-14-2014, 04:46 PM
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I have SS line mostly as well as some CS line, depending on where they are. Aluminum fittings into steel, steel fittings into aluminum in some cases - and with the exception of NPT fittings, are all AN. Eight years with them made up in the brake system, 5 in the fuel system without any sign of corrosion. I have not and never will use antisieze. I will use Teflon tape on NPT fittings if appropriate - temp and pressure senders are not appropriate and wont work correctly or at all with tape or sealant. If a car is used in a corrosive (think rust belt) part of the country, consider SS instead of CS
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