Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-11-2008, 17:27   #1
Registered User
 
orion1's Avatar

Join Date: May 2006
Location: Slidell, Louisiana, USA
Boat: William Atkin Cutter, 35'
Posts: 147
Images: 8
Racor Fuel Filter Location

My Racor is and has apparently always been mounted in its current location. It is mounted near the bottom of the fuel tank app. 18" below the top. Both the feed line and the return leave the top of the tank and go directly to the filter. The filter is even with the top of the engine.

This arrangement has apparently always worked well. I have put 100 hours on it since purchasing the boat, with no problem. The filter bowl seems clean. It is time to change the element and I am curious about something, which has caused me to hesitate.

The fuel line from the tank to the Racor has no shut off valve. If I remove the spin on filter, will the fuel pour out from suction? I feel that there should be a shut off before the filter anyway. The previous owner always had his mech do the maint and therefore cannot help.
__________________

__________________
"Love My Country, Fear My Government"
orion1 is offline   Reply With Quote
Old 21-11-2008, 17:39   #2
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Gravity certainly should take over when you open up the filter. You should most certainly have a fuel cut off at the pick up on your tank or at least between the tank and the filter. How would you cut off the fuel supply in case of an emergency? BTW, are you certain the return line runs through the Racor? This is a bit unusual.
__________________

__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 17:41   #3
Registered User

Join Date: Jun 2005
Posts: 1,901
Quote:
Originally Posted by Chuck Baier View Post
How would you cut off the fuel supply in case of an emergency?
vice grips clamp the fuel line nicely.
__________________
never monday is offline   Reply With Quote
Old 21-11-2008, 17:43   #4
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Quote:
Originally Posted by never monday View Post
vice grips clamp the fuel line nicely.
Yes and they also tear holes in the lines. Much better to have a valve to do that.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 18:03   #5
Registered User

Join Date: Jun 2005
Posts: 1,901
Quote:
Originally Posted by Chuck Baier View Post
Yes and they also tear holes in the lines. Much better to have a valve to do that.
are we talking proper or emergency? I thought you mentioned emergency measures.
__________________
never monday is offline   Reply With Quote
Old 21-11-2008, 18:14   #6
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
What I meant was that it needs to have a proper cut off valve in case of an emergency
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 18:59   #7
Registered User
 
orion1's Avatar

Join Date: May 2006
Location: Slidell, Louisiana, USA
Boat: William Atkin Cutter, 35'
Posts: 147
Images: 8
Thanks all, I totally agree on the valve and will install one as soon as I do the deed, but did not know exactly what to expect when the filter element was removed. Vice grips would certainly work in an emergency. Hope that does not happen yet.

The return line does not come from the Racor but from the engine and follows the feed line back up to the tank. Sorry about the confusion!

Guess I will install a valve at the feed line tank exit, that way I can remove it without filling the bilge and only loose the fuel in the short line. Have never had tank above the filter before.
__________________
"Love My Country, Fear My Government"
orion1 is offline   Reply With Quote
Old 21-11-2008, 19:58   #8
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
Put a valve in your return line at the tank as well.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 21-11-2008, 20:00   #9
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Quote:
Originally Posted by David M View Post
Put a valve in your return line at the tank as well.

and that would be why?
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 20:04   #10
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
You want a valve wherever you have a potential source of fuel for safety reasons. Even a return line can back flow under the right circumstances. I have valves on both of my return lines at the tank (twin engine). The Coast Guard required it when it was a Subchapter T vessel.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 21-11-2008, 20:08   #11
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Most return lines I have encountered are simply connected to a fitting in the top of the tank with no pick up tube. So unless the tank is overfilled it is very unlikely the fuel can back siphon from the tank and a valve would not stop a leak in the return line.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 20:12   #12
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
I never said a siphon effect.

"unless the tank is overfilled"...that's never happened? You have never had large waves that cause the bow to dip? You have never had the tanks full with a big list where you know the fuel is pressing against the top of the tank?

Stuff happens. Hopefully you will never need that valve.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 21-11-2008, 20:16   #13
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Quote:
Originally Posted by David M View Post
I never said a siphon effect.

"unless the tank is overfilled"...that's never happened? You have never had large waves that cause the bow to dip? You have never had the tanks full with a big list where you know the fuel is pressing against the top of the tank?

Stuff happens. Hopefully you will never need that valve.

Not sure how some handle it offshore but under way in any seas large or small and that includes gales in the Gulf Stream we have never closed the valves on our fuel tanks. Not saying it should not be done just asking why. In all of the years I have been working on boats and there have been a lot of them, I don't recall ever seeing a valve on a return line. Forgetting to open it could cause a problem. If you forget to open your intake line the engine will shut down at worst.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 21-11-2008, 20:22   #14
Registered User
 
orion1's Avatar

Join Date: May 2006
Location: Slidell, Louisiana, USA
Boat: William Atkin Cutter, 35'
Posts: 147
Images: 8
I'm not sure but it just occured to me that it may make a difference from a gravity standpoint since the filter and the end of the pick up tube are at about the same level. Maybe that will lessen the amount of siphon potential. Just wondering how they did the change in the past.

If I place a valve at tht top of the tank, the tube below the valve would drain when the filter element is removed. That might make it hard to get flow after valve is reopened, without turning over the engine.

Wish I understood the fuel system better. Need to read more I know.
__________________
"Love My Country, Fear My Government"
orion1 is offline   Reply With Quote
Old 21-11-2008, 20:30   #15
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Not necessarily since there needs to be air or more fuel behind it to allow the fuel to flow. Yes some might leak out but most will not since with the valve closed and the line full of fuel it almost creates a vacuum that keeps the fuel from running out. depending on your engine, etc. you will at least need to fill the filter with fuel or use a pump, the one on the engine, to bleed the system and or fill the filter each time you change it. It is kinda like sticking a straw in a glass of liquid, putting your finger over the straw and pulling it out. The liquid stays in the straw.
__________________

__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Reply

Tags
fuel, fuel filter, racor

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cleaning Racor 500 FG Filter - Problem ! MarkJ Engines and Propulsion Systems 36 16-02-2012 12:56
Tell me about my primary fuel filter theonecalledtom Construction, Maintenance & Refit 8 31-03-2008 18:30
Fuel filter location rdempsey Engines and Propulsion Systems 19 02-11-2007 13:01
Racor Turbine Fuel Filter/Water Seperator drh1965 Engines and Propulsion Systems 11 30-08-2007 08:48
CAV fuel filter seafox Engines and Propulsion Systems 8 21-10-2006 02:39



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:18.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.