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Aeromotive FPR port thread size.


hodge

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Thats -6 or -10. A 'yankism' it may be but thats what all firms like thinkautomotive know when you call.

 

But IIRC -AN fittings are actually the wrong ones for the Aeromotive FPR.

 

The difference being that specifically that an -6 AN fitting does not require an O'ring or a seal of any kind because of the conical end to the fitting that seals the joint.

I seem to remember the Aeromotive FPR has a 9/16 UNF thread, so if you just fit a -6 AN fitting it will leak because it doesn't have the cone machined into the bottom of the hole to accept the -6 form.

The correct fitting would be a -6 hose to 9/16 UNF male. You'll also need an O'ring or some other kind of seal to prevent it from leaking.

 

I may be wrong, but I vaguely remember having to fit an O'ring to mine for this very reason.

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It'll either be 9/16"-18 (if it looks about half inch diameter inside the FPR) or 7/8"-14 (if it looks more than 3/4" dimater in the FPR).

 

You will need an O ring on the side that screws into the regulator and the other side needs to be whatever suits the fuel line size you are intending to run (most like a -6, -8 or -10 AN/JIC male).

 

 

 

Edit: Tony is correct.

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Whenever we buy a reg and ends and wherever it comes from the ends are the same and they always have an O ring on them, I can't remember seeing anywhere in the reg for the conical part to seal on. Never had a leak doing it that way so thats how mine will stay.

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Whenever we buy a reg and ends and wherever it comes from the ends are the same and they always have an O ring on them, I can't remember seeing anywhere in the reg for the conical part to seal on. Never had a leak doing it that way so thats how mine will stay.

 

You are right dude - there is no mating cone in the regulator for an AN/JIC fitting to seal against.

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So you're using -6 AN with an O'ring?

It'll work, because the O'ring is sealing it, but the conical bit that makes the fitting -6 AN as opposed to a 9/16 UNF is doing sod all.

 

The thing to be careful of is if the hole you're trying to fit the - 6AN into isn't designed to use those fittings it may not be deep enough. Obviously in Dude's case it was, but it may not always be so for every application.

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So you're using -6 AN with an O'ring?

It'll work, because the O'ring is sealing it, but the conical bit that makes the fitting -6 AN as opposed to a 9/16 UNF is doing sod all.

 

The thing to be careful of is if the hole you're trying to fit the - 6AN into isn't designed to use those fittings it may not be deep enough. Obviously in Dude's case it was, but it may not always be so for every application.

 

I have had them seal up without the o ring, you would think that something as dear as an Aeromotive would come with the right fittings.

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http://www.stealth316.com/2-fpr_upgrade.htm

 

If you are contemplating using anything other than normal petrol the O ring may need to be other than Buna-N material. I don't THINK Buna-N likes Ethanol, for example. It's a horrible way to seal an AN fitting, and typically Yank. Aeromotive say the FPR's are Ethanol compatible, so assuming they come with Buna-N o rings you should be OK with E fuels

port.jpg

port2.jpg

Edited by Chris Wilson (see edit history)
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  • 1 year later...

Just bumping this as I have been looking into getting fittings for an Aeromotive FPR. According to the Aeromotive website the thread is ORB-10. I have no idea what that actually means but I'm guessing its a -10 size, which would be 7/8 UNF, without the conical end.

 

This is a "ORB-10 to AN-6" downsizer.

image

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You're absolutely correct. It was the point I was trying to make back when this thread was originally put up. Putting a -6 AN fitting into the port without an O'ring won't seal correctly. You need an 9/16 UNF fitting with an O'ring to seal to the FPR. The other side of this fitting will go to whatever size hose you've got.

So if you have a -6 hose you would use a 9/16 UNF to -6 AN fitting.

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You're absolutely correct. It was the point I was trying to make back when this thread was originally put up. Putting a -6 AN fitting into the port without an O'ring won't seal correctly. You need an 9/16 UNF fitting with an O'ring to seal to the FPR. The other side of this fitting will go to whatever size hose you've got.

So if you have a -6 hose you would use a 9/16 UNF to -6 AN fitting.

 

Yeah the o-ring was specifically mentioned too, clearly the linchpin of the thing :D

 

Just spoke to the guy selling and he said that ORB-10 is exactly the same as AN-10 with regards to the thread. The difference is that the end is cut off and an O-ring is required :)

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Aeromotive do a couple of different size FPR they do 1 with 9/16 UNF and a 7/8 UNF for bigger powered cars.

The 1 I've got is the 9/16 UNF model.

 

According to the guy i'm talking to they only offer the 1 now and it's the AN-10 one (7/8). MVP still have both port sizes listed on their website but I didn't contact them to see if it was out of date.

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