Diesel filter - sealing - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 07-09-2007
Banned
 
Join Date: Apr 2007
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
clayjay is an unknown quantity at this point
Diesel filter - sealing

I've just purchased a large Diesel filter for my supply line - the type with the large glass bowl at the bottom for filtering out water. I've also had to purchase the brass tails for the fuel lines to plug onto on the inlet and outlet.
My question is what compound, if any, do I use to seal them ?
With domestic plumbing you use PTFE tape on threads to make them watertight, is there something for use in these situations that is diesel resistant ?
Reply With Quote Share with Facebook
  #2  
Old 07-09-2007
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,881
Thanks: 9
Thanked 77 Times in 70 Posts
Rep Power: 15
RichH will become famous soon enough
The threads of such fittings dont do any of the 'sealing' ... either with a compression fitting (most common) the brass 'ferrule' makes a 'ring seal' (metal to metal) with the tubing end; a flared or double flared (preferred) also are 'metal - to - metal' seals.

PTFE tape is resistant and chemically compatible with Diesel Oil .... but if the threads of such a connector are leaking you have a BAD connector and should replace it with new -- if the threads are leaking it means that the metal to metal seal in the connector is not working.

Compression fittings (the cheapest and commonest fittings on boat fuel lines) are usually a 'one time only' seal as the 'ferrule' will compress the copper tube to the point of not being useable in subsequent 'tightenings' ... although most DIY'ers will re-tighten them again and again ... and wind up with 'mysterious' air suction leaks galore in the future.
Reply With Quote Share with Facebook
  #3  
Old 07-09-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Go to the store and ask them for some diesel fuel line pipe thread dope or sealant. This is one possible compound you could use. Here is another. Generally, teflon tape isn't recommended for diesel fuel lines, especially if they are downstream of the fuel filter, since the teflon tape can shred and the bits can foul the fuel injectors.

BTW, RichH, I think he is talking about the lines going into a big Racor-type fuel/water separator filter. These are generally connected using fuel hose, not copper pipe, and as such, the threads are what seal the connection... since it is just a hose nipple that he is screwing into the side of the filter housing. Compression fittings and flared fittings are generally only used with copper pipe fuel lines, and last I checked, it wasn't generally common to find copper pipes in use on a sailboat diesel fuel system for most of the runs. Copper pipe is a poor material on a boat, as it tends to fatigue from the motion and vibration of a boat.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.

Last edited by sailingdog; 07-09-2007 at 01:07 AM.
Reply With Quote Share with Facebook
  #4  
Old 07-09-2007
Banned
 
Join Date: Apr 2007
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
clayjay is an unknown quantity at this point
Thanks guy's. Yes it is the Racor type filter and the fittings screw into the body. They are brass and have a 45degree seat which corresponds quite well with the seat in the body. I just want to cover all bases as it would be sods law to fit it all, turn on the fuel tap and then watch the Diesel start to drip out from the threads.
Reply With Quote Share with Facebook
  #5  
Old 07-09-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Clayjay-

Get a small can of the non-hardening rectorseal. It'll last you a long time...and it's good stuff to have aboard. You can use it for propane fittings, water lines, diesel lines...basically any thing you need to have not leak that has threaded fittings.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel fuel filter sneuman Gear & Maintenance 1 06-29-2005 05:19 AM
Diesel Fuel Essentials Tom Wood Gear and Maintenance Articles 0 03-22-2004 07:00 PM
Diesel Fuel Essentials Tom Wood Her Sailnet Articles 0 03-22-2004 07:00 PM
Diesel filtration option? maxim_rfeld Gear & Maintenance 7 10-10-2003 12:52 PM
diesel fuel filter tho52mas Gear & Maintenance 2 05-16-2002 10:26 PM


All times are GMT -4. The time now is 03:38 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.