(Fuel System Fittings)

[ben_fordham_uoitmotorsports]

I just picked up a Summit racing fuel pump for our 2010 car. It has barb 5/16" fittings in and out. I'm not sure what size fittings to use on the fuel tank pick up, and to source the right fittings for the fuel system?? Can someone tell me what -6AN means? I read something that told me ArmyNavy grade fittings but I wasn't sure about the number or accronym.

Thanks

Ben

[ben_fordham_uoitmotorsports]

I just picked up a Summit racing fuel pump for our 2010 car. It has barb 5/16" fittings in and out. I'm not sure what size fittings to use on the fuel tank pick up, and to source the right fittings for the fuel system?? Can someone tell me what -6AN means? I read something that told me ArmyNavy grade fittings but I wasn't sure about the number or accronym.

Thanks

Ben

[js10coastr]

http://www.google.com/search?h...aql=&oq=army+navy+fi (http://www.google.com/search?hl=en&safe=off&client=firefox-a&hs=MrP&rls=org.mozilla%3Aen-US%3Aofficial&q=army+navy+fittings&aq=0&aqi=g6&aql=&oq=army+navy+fi)

see first link

[Ockham]

Wikipedia is your friend.

http://en.wikipedia.org/wiki/AN_fitting

Be warned that -6AN hose isn't designed to mate with 5/16in male barbs.

[Wesley]

Even a Google search would answer this question. And in far greater detail than anyone here will care to go into.

[D Collins Jr]

Hmm, class doesn't start for about a half hour. I think I'll prove my friend Wes wrong. Plus I'm feeling unusually generous.

-6 is a reference to the size of the fitting. The dash number with fittings are based on the US system, so please don't flame me with how evil the US system is. If the number is divided by 16, that is the fractional size (in inches) of the fitting. IE, a -3 fitting is 3/16 of an inch, a -4 is 1/4 inch, and your -6 is a 3/8 inch fitting. For 5/16 hose, you need a 5/16" fitting.

The "AN" portion does refer to the army/navy standard. AN fittings are quite common.

Be advised that there are other important characteristics of fittings, including "JIC" and "NPT" style. This is really important. I may weigh in on these styles later, but please, make sure you read about them before you start tightening things together! That can be an expensive mistake to make.

[ben_fordham_uoitmotorsports]

Thanks boys, appreciate it.

[Ockham]

Finding the right combination of fittings can be a pain. What are you adapting the 5/16in fuel line to (ie, what fitting style does your fuel rail accept)? Maybe we can save you some pain.

Be warned that if you're using fuel injection hose, only SAE-approved stuff (R9 hose) will get the judge's go-ahead.

[Tech Guy]

Ben,
As your fuel pump has barb fittings, don't forget that you cannot use metal braided fuel hose like Aeroquip. The tech inspectors will not allow you to use clamps over Aeroquip. You will have to use reinforced rubber fuel hose. Ockham is correct, you need SAE spec R9 fuel hose, not the R7, which is for low pressure lines to use with carburetors. The R9 hose is usually marked "For Fuel Injection". With the rubber fuel hoses you have to have the correct fuel line clamps (see the Rules). You can get the fuel line and the clamps from any good auto parts store.

[Wesley]

I think a good place to start for line sizing would be stock size.

We ran that same fuel pump for 3 years that you have, and I ended up just making a couple AN adapters for the pump on the ol' manual lathe. I think the fitting with the check valve is 1.25x6... maybe. I don't remember what the big inlet barb is.

For the fuel tank pickup, I've made weld-on AN fittings in the past, but I think it would be easier to put an NPT bung on it and use off-the-shelf AN-NPT fittings. It's easier to accidentally screw the threads up (or melt them off welding) on a protruding AN fitting

[Grant Mahler]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Ockham:
Be warned that if you're using fuel injection hose, only SAE-approved stuff (R9 hose) will get the judge's go-ahead. </div></BLOCKQUOTE>

I know my team ran into this at comp before as well, but I could never find it in the rules.

Specifically, B8.8 and B8.9 make NO mention of SAE R9 Hi-Pressure hose, and I am unable to find it elsewhere in the rules. Though obviously, it should be used (and treated carefully, with abrasion protection, etc).

[DcooL]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> I know my team ran into this at comp before as well, but I could never find it in the rules.

Specifically, B8.8 and B8.9 make NO mention of SAE R9 Hi-Pressure hose, and I am unable to find it elsewhere in the rules. Though obviously, it should be used (and treated carefully, with abrasion protection, etc). </div></BLOCKQUOTE>

Unfortunately seems to fall under the 'best engineering practices' mentioned at the beginning of the rules, leading to some degree of arbitration at competition.

[ben_fordham_uoitmotorsports]

I picked up 4 ft of 5/16" fuel injection hose, at 5 bucks a foot it was pretty. The regulator I purchased has -6 AN inlet and outlet which I took to a fitting company, and the guy showed me only a 9/16" fine thread bolt, screws into. I was hoping to use brass thread in fittings with a barb for the fuel hose, and use fuel injecting hose clamps (t-bar clamps) for extra hold on the barb. I talked to a local guy, and he said to tap the regulator to 3/8" to be able to get brass fittings with barb to use on this regulator. Should I tap the regulator? Or use expensive threaded lines?

[AxelRipper]

I do believe that you can find barbed AN fittings if you look around. I'm not sure what direction to point you in, but I remember coming across them when I was looking at a system for my truck.

I wouldn't advise tapping the regulator... i've never seen retapping a hole with a new thread pattern work very well

[jd74914]

Don't retap the regulator. Use the correct A-N to hose barb adapter; they do make them.

There are probably many places to get them, but I know of only one. Go to Race Part Solutions and ask them for Product ID# FRA4841, Hose Barb to A-N Adapter. The P/N for a -6 AN-Male to 3/8" bar is 484106 and it costs $3.20. You can find it on their website by clicking the AN fittings tap and going into the pipe/hose adapter section.