I'm looking for an 1/8 npt to 5/32 hose adapter for my boost gauge. I haven't found anything locally. My gauge came with a hard line and a brass adapter to get it to 1/8 npt. My plan is to get a 5/32 hose T and then run a short length of 5/32 line into the adapter. Does anyone have any suggestions? Thanks.

 

Do you need an 1/8" NPT (male or female?) fitting with an 5/32nds hose nipple on the other end?

 

Exactly! 1/8 NPT female with 5/32 nipple on the other end. Checked Autozone, nada. NAPA was closed today. :(

 

Yeah, 1/8 npt (preferably female) to a 5/32" hose barb.

 

Your local NAPA should have this fitting, if you still can't find one tomorrow, let me know. I'm pretty sure there is such a fitting, but if not, you may need to use a 1/8" NPT male with a union.

 

No luck partsman. NAPA had a 5/32 T fitting but did not have anything that could get it to 1/8 npt. The smallest npt to hose adapter they had was for 1/4" hose (or maybe it was 3/16). Either way, it was larger than 5/32.

 

Bump. PARTSMAN, you there?

 

Can you piggy back 2 adapters to make it work?

 

I could but the problem is actually finding anything with a 5/32 hose barb. Most adapters are for 1/8, 3/16 or 1/4. I was lucky enough to find the T with all 5/32 barbs.

 

Here's a thought: there is a vac nipple on the IC inlet horn, right? It has to thread into the horn. So, it's a MINI part. I just can't find it on RealOEM.
So, if you had that part, all you would need to do is adapt it's thread to 1/8 NPT. Maybe, might get lucky and it's already the right size.

 

I ended up getting a 10 pack of brass adapters on Ebay for $3 (plus $8 shipping ). I'll use two of them and get a 1/8" npt tee fitting so the whole thing will be brass. I'll post pics when I get to installing it.

 

http://www.mcmaster.com/

If there is such a fitting, the above link will have it.

 

Yeah they do have one but shipping would be pretty bad. Also, the only 5/32" barb they had was plastic and I preferred brass.

I picked up a 1/8" npt tee fitting at Ace today and will have it ready when the adapters get here.

 

Well now I'm mad (and totally stumped). The 1/8 npt by 5/32 adapters came today and the hose barb end was definitely smaller than 5/32. I measured it to be just under 1/8" OD. I sent the place an email to see if they sent the wrong thing but still, I haven't seen this piece in brass anywhere else.

So now my question is how is everyone hooking up their boost gauges. If I get a 5/32 tee fitting and run soft line instead of hard, I would still have to get an adapter that goes into the back of the gauge. This adapter would still need to be npt by 5/32" hose barb. Are you guys just using a 1/8 or 3/16 barb and making it fit?

 

Sorry man, I totally spaced this thread.

Ok, fork over some more info...

What boost gauge are you using?

What kind of fitting is on the back of it for the line?

 

There are no nipples on the IC inlet horn, the one you are thinking of is at the end of the intake manifold, and it's pressed in not threaded.

 

I'm using a Stewart Warner gauge. The back of the gauge has a fitting (I believe it's 1/8" npt) and an adapter to hook up a 1/8" OD hard line. They supply the same adapters for the other end to get you back to 1/8" npt. So I now need to tee into the stock 5/32" vacuum line.

The way I see it, I have 3 choices:
1. Install an 1/8" npt tee fitting and get two 1/8" npt to 5/32" hose adapters. The boost gauge line will just screw into the open end. (This was my plan and the reason why I started this thread to find the hose adapters)
2. Install a 5/32 tee that has hose barbs on all ends. This will go easy into the stock line. I would then have to get a length of 5/32 hose and get a reduction coupling to get it to a standard size like 1/8". From this, I would get the adapters to connect it to the hard line.
3. Remove the hard line completely. Tee into the stock line and run a 5/32" soft line all the way up to the boost gauge. This would still require me finding either a reduction coupling or that 1/8" npt to 5/32" hose adapter.

The simplest solution (and the one with the fewest fittings to leak) is #1.

 

This pic is from the Stewart-Warner site...

..is this similar to the hardware you have?
If it is, then that little nut on the left along with one of those little compression sleeves under it, is all you need to to hook up that nylon tubing to the back of the gauge.

Run that nylon tubing to a 5/32nds plastic tee that will sit pretty much right in front of the fuel pressure regulator.
To connect the tubing to the tee, go to NAPA, they have an assortment of rubber adapters that will fit tight on the tubing so you can plug it onto the tee. That's how I did mine, and it works great.

Here's the rest of what I did...
Remove the plastic line from the fuel pressure regulator and at the manifold port, do not remove the rubber ends from the line.

Starting with the manifold end of the line, cut the rubber end off the plastic line leaving about 1 1/2 to 2 inches of plastic line with the rubber end on it.
Using the correct size rubber vacuum line(5/32nds?) push that over the plastic line so that the rubber hose goes right up to the rubber end, install back on the manifold nipple. Run the other end to the tee that should be right in front of the fuel pressure regulator. You now have two of the three lines hooked up.

Go back to the factory plastic line and cut the other rubber end off of that, leave some of the plastic line on that one too. I can't remember how much, but you'll see once you get in there. Do the same thing with the rubber hose, push it over the plastic line all the way up to the rubber end, and install back on the FPR nipple. Run the other end to the tee that's right there and you're done.

Why go through all that trouble using the rubber ends off the factory line?
It's a pain in the azz pushing rubber hose onto the manifold nipple and the FPR nipple. You may think otherwise, this is just how I did it.

I used some plastic wire loom to protect the rubber hose where it will contact the manifold. I also ran my nylon tubing from the gauge inside some rubber vacuum hose to hide it and protect it.

Good luck.

 

Thanks PARTSMAN. I didn't know about the rubber sleeves. I think I understand what you did. You basically cut the factory line were you want to put the tee, use the new rubber sleeves to attach the tee to the lines and then reconnect the lines to the FPR and manifold using the stock rubber ends. Do I need to remove both ends of the factory plastic line or can it be done with just one end off?

I'll give it a try this weekend.

 

You're welcome.
It's a lot easier to just remove the factory plastic line and work on it. You'll see what I mean when you get in there. Basically, you'll will be replacing the stock plastic line with rubber hose, but using the ends to still connect to the manifold and FPR. That's why I say to leave some of the plastic line on the rubber end, so you can push enough of the rubber vacuum hose over it to make it air tight.
Keep in mind this is just the way I did it, you may not have any trouble getting the 5/32nds vacuum hose on to the manifold and FPR nipples, in which case the stock plastic line and rubber ends are not needed.

 

Ah, I see. I know my NAPA has 5/32 soft line and hopefully, they know what the rubber adapters are for the boost gauge line.

 

The NAPA part number for the assortment is 2-660.

The NAPA part number for the straight 1/8"x5/32" is 2-665.

http://napaonline.com/MasterPages/NO...or+-+Universal

This is the one you'll use to adapt the nylon tubing to the tee.

 

Awesome. Thanks for the help!

 

You're welcome. Let me know how you make out.

 

Went up to NAPA and they had to order the connector. It'll be in Wednesday . I picked up some 5/32 soft line while I was there. Looks like I'll have to wait a few more days before getting started.