Race Car Tech Discuss anything related to road racing and auto X.

Pressure testing and cleaning AN lines?

Old 08-24-10, 03:38 PM
  #1  
Senior Member
5 Year Member
Thread Starter
iTrader: (2)
 
palsor1's Avatar
 
Join Date: Apr 2006
Location: Austin, TX
Posts: 355
Likes: 0
Received 0 Likes on 0 Posts
Pressure testing and cleaning AN lines?

Hey guys,

1. I've replaced most of the lines in my car with stainless braided lines with AN fittings. However, before I start putting gas/oil through them, I'd like to pressure test them to make sure they don't leak, and to make sure they'll hold together in at least a basic test. I have tried capping one end with an AN cap, putting a hose bard on the other end, and using a mitty vac to pull a vacuum. However, that will only tell me if the lines are airtight and I see two problems with this test. First, I'm assuming that they don't actually have to be airtight to be fuel/oil-tight. Second, it doesn't actually pressure test them to make the the ends won't just pop off once I apply normal fuel pressure to them. Sooo... Anyone have any good techniques for pressure testing lines, preferably doable in a normal garage? I'm not looking for anything crazy, just up to 100psi or so as a basic test. I'd also prefer to use liquid of some sort rather than just pumping them full of air. Of course if they're airtight, that's spectacular, but if they're not airtight, trying to pump them full of air doesn't help much.

2. Anyone have any good techniques for cleaning AN lines before installation to make sure there aren't any bits of stainless braid or dirt/dust in them? I thought about just blowing them out with my compressor, but I figured I'd ask and see if anyone has any better ideas.

Thanks!

- Andy
palsor1 is offline  
Old 08-24-10, 04:38 PM
  #2  
10 lb. boost, 5lb. bag
10 Year Member
iTrader: (1)
 
Gene's Avatar
 
Join Date: Mar 2001
Location: New York, NY
Posts: 1,076
Likes: 0
Received 0 Likes on 0 Posts
If they're not airtight they're not gonna be water tight!

Make some caps with tire valve stems on one end and a fitting for a pressure gauge on the other, pump them full of compressed air and see if it leaks out. On larger ones you should fill most of the way with water before applying the air pressure. That's a safety thing... if a large hose is full of compressed air there is a tremendous amount of stored energy in there and if it fails it will be impressive. If it's mostly full of un-compressible water and a small pocket of compressed air there is a lot less energy to release if it blows.
Gene is offline  
Old 08-24-10, 05:06 PM
  #3  
Senior Member
5 Year Member
Thread Starter
iTrader: (2)
 
palsor1's Avatar
 
Join Date: Apr 2006
Location: Austin, TX
Posts: 355
Likes: 0
Received 0 Likes on 0 Posts
Good ideas on all counts. Got any suggestions on how to get the valve stem fitted onto a line? I can imagine how to connect a pressure gauge (NPT gauge -> NPT/AN adapter -> line) but I can't imagine how to connect a valve stem.
palsor1 is offline  
Old 08-24-10, 10:38 PM
  #4  
10 lb. boost, 5lb. bag
10 Year Member
iTrader: (1)
 
Gene's Avatar
 
Join Date: Mar 2001
Location: New York, NY
Posts: 1,076
Likes: 0
Received 0 Likes on 0 Posts
Drill a hole the right size in the cap and put a valve stem in the hole Use the metal type that uses rubber grommets and a nut.

Or just buy everything ready to go:

http://www.jegs.com/p/JEGS/JEGS-AN-H...87074/10002/-1

http://www.jegs.com/i/Earls/361/D016...oductId=763816
Gene is offline  
Old 09-09-10, 10:58 AM
  #5  
Senior Member
5 Year Member
Thread Starter
iTrader: (2)
 
palsor1's Avatar
 
Join Date: Apr 2006
Location: Austin, TX
Posts: 355
Likes: 0
Received 0 Likes on 0 Posts
Here's what I ended up making for this. About $15 of home depot air compressor parts and the one AN fitting that I had laying around.
Attached Thumbnails Pressure testing and cleaning AN lines?-photo.jpg  
palsor1 is offline  
Old 09-09-10, 06:50 PM
  #6  
FC Racer
15 Year Member
 
CJarrett's Avatar
 
Join Date: May 2001
Location: Vancouver BC Canada
Posts: 412
Likes: 0
Received 0 Likes on 0 Posts
What about cleaning them? Im curious too.
CJarrett is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
20
03-29-18 02:05 PM
efini7
Test Area 51
1
09-04-15 02:59 AM


Thread Tools
Search this Thread
Quick Reply: Pressure testing and cleaning AN lines?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: