Reply
 
Thread Tools Display Modes
 
Old 05-24-2014, 02:11 PM   #1
Senior Member
 
Join Date: Jan 2008
Posts: 122
Racors sucking air?

Hi all,
Has anyone had issues with Racors sucking air and causing the motor to die as a result?
After 29 faithful years, the Racor on my genny pooped out. I did a complete rebuild with a seal kit but it still kept sucking air causing the engine to die. Finally bought a new racor assembly and that fixed it.

Anyone else experience this?

Taras
__________________
Advertisement

Taras is offline   Reply With Quote
Old 05-24-2014, 05:13 PM   #2
Guru
 
City: Full Time Cruising East Coast
Country: USA
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 756
Did you check closely if the o rings were straight? Easy to get a 90 degree twist that can barely be noticed
__________________

__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 05-24-2014, 06:03 PM   #3
Guru
 
Shoalwaters's Avatar
 
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 681
Taras, It might help to know which type of Racor filter you have. I'm guessing it was either a #120 or a #500
Attached Images
  
__________________
Mike
If all else fails, read the instructions
If it ain't broke, don't fix it
Shoalwaters is offline   Reply With Quote
Old 05-24-2014, 07:56 PM   #4
Senior Member
 
supertramp's Avatar
 
Country: Cubazuela
Vessel Name: " Supertramp "
Vessel Model: Marine Trader Widebody 50 feet
Join Date: Sep 2008
Posts: 150
Close the valve on the diesel tank.
Solve the diesel line in front of the engine and conclude provisionally a diesel electric pump (I have such a thing as a spear for my gens) on this line with diesel. With this pressure can you see where your filter has a leak.Alwais give a succion system pressure und you find the air leak.
_____________
Norbert
supertramp is offline   Reply With Quote
Old 05-25-2014, 01:25 PM   #5
Senior Member
 
Join Date: Jan 2008
Posts: 122
Since my Keel Tank was empty, this was introducing air into the system. I shut that valve off and the air leak stopped. This seems weird to me. I have two saddle tanks that I typically use. Plenty of fuel in those. The keel tank however is empty.
Has anyone else experienced this.
Taras
Taras is offline   Reply With Quote
Old 05-25-2014, 08:43 PM   #6
Senior Member
 
supertramp's Avatar
 
Country: Cubazuela
Vessel Name: " Supertramp "
Vessel Model: Marine Trader Widebody 50 feet
Join Date: Sep 2008
Posts: 150
I have 6 dieseltanks on board (1200 gal.en total) 3 tanks are filling per gradient the keel tank with manual valve. I fill and trim with a transfer-pump from the keel tank the two maintanks . The two main tanks are higher than the engine and so always without air problems in the system.
____________
Norbert
supertramp is offline   Reply With Quote
Old 05-26-2014, 07:38 AM   #7
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,534
The two main tanks are higher than the engine and so always without air problems in the system.

Gravity is every cruising boats friend , Untaxed (so far) and a fuel leak is 100,000 times easier to find than an air leak.

For folks with cruising ideas an electric pump from the tank,(with valves that could pressurize the lines filters and even prime the engine might be a great low cost addition.
FF is offline   Reply With Quote
Old 05-26-2014, 12:14 PM   #8
TF Site Team
 
Bay Pelican's Avatar
 
City: Chicago, IL
Country: USA
Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,795
Quote:
Originally Posted by FF View Post
The two main tanks are higher than the engine and so always without air problems in the system.


For folks with cruising ideas an electric pump from the tank,(with valves that could pressurize the lines filters and even prime the engine might be a great low cost addition.

Understatement in my experience. Electric pump primes an engine, and in most cases can overcome an air leak by pressurizing the fuel line turning the air leak into a fuel leak. Was able to get back to port with an air leak using an electric fuel pump. Was in open water between islands and not in a good place to investigate what the problem was.
__________________
Marty
Bay Pelican is offline   Reply With Quote
Old 05-26-2014, 12:39 PM   #9
Senior Member
 
supertramp's Avatar
 
Country: Cubazuela
Vessel Name: " Supertramp "
Vessel Model: Marine Trader Widebody 50 feet
Join Date: Sep 2008
Posts: 150
Quote:
Originally Posted by Bay Pelican View Post
Understatement in my experience. Electric pump primes an engine, and in most cases can overcome an air leak by pressurizing the fuel line turning the air leak into a fuel leak. Was able to get back to port with an air leak using an electric fuel pump. Was in open water between islands and not in a good place to investigate what the problem was.

Marty,
i have an electric fuel pump with a fuse and a switch and a fuel filter mounted on a board for emergency and can bridge quickly other pumps .
_____________
Norbert
supertramp is offline   Reply With Quote
Old 05-26-2014, 12:46 PM   #10
Senior Member
 
Rebel112r's Avatar
 
City: Birch bay wa
Country: USA
Vessel Name: Rogue
Vessel Model: North Pacific 42
Join Date: Feb 2013
Posts: 396
I have had troubles with the Racors with the small priming pump. They started losing a prime. Finally replaced O-ring on pump, and stopped using them to prime system. DS
Rebel112r is online now   Reply With Quote
Old 05-26-2014, 05:04 PM   #11
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,265
In recent months my engine would stall immediately after starting. I had to prime the engine before restarting even after having turned off the engine for an hour or more. Replacing the rubber gaskets on the twin Racor 500s solved the problem. The gaskets had become hard and weren't making a good seal.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 05-26-2014, 07:22 PM   #12
TF Site Team
 
Bay Pelican's Avatar
 
City: Chicago, IL
Country: USA
Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,795
Quote:
Originally Posted by markpierce View Post
In recent months my engine would stall immediately after starting. I had to prime the engine before restarting even after having turned off the engine for an hour or more. Replacing the rubber gaskets on the twin Racor 500s solved the problem. The gaskets had become hard and weren't making a good seal.
By gaskets are you referring to the large O-Ring that comes with every Racor filter element?
__________________
Marty
Bay Pelican is offline   Reply With Quote
Old 05-26-2014, 08:03 PM   #13
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,265
Quote:
Originally Posted by Bay Pelican View Post
By gaskets are you referring to the large O-Ring that comes with every Racor filter element?
Yes, as well as the little one for the turnbolt securing the lid holding the large O-ring.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 05-28-2014, 06:05 PM   #14
Veteran Member
 
City: EASTHAMPTON, NEW YORK
Country: USA
Vessel Name: REFUGE
Vessel Model: Performance Trawler 35
Join Date: Jun 2012
Posts: 76
Racor Problem

Had similar problem with my Racor 1000 series. In addition to changing gaskets I changed the floating "check ball" in the assembly. I believe the ball floats up, against a seal when the engine is shut down which would then prevent loss of prime.
The Racor parts numbers:
Replacement Check Ball Kit: RK11028B
Service Kit: RK111404 includes check ball, cap screws and gaskets
Bensjoy is offline   Reply With Quote
Old 05-28-2014, 07:02 PM   #15
Dauntless Award
 
Wxx3's Avatar
 
City: New York, NY
Country: USA
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,313
Quote:
Originally Posted by Bay Pelican View Post
Understatement in my experience. Electric pump primes an engine, and in most cases can overcome an air leak by pressurizing the fuel line turning the air leak into a fuel leak. Was able to get back to port with an air leak using an electric fuel pump. Was in open water between islands and not in a good place to investigate what the problem was.
Me too. But my problem was caused by me.

I had transferred all the fuel from one tank to the other and did not close the supply valve.
Genny did not like that.
Used electric pump to get genny to run again.
Then, two days later, when i did the exact same thing, I had to use electric pump to prime racors to get genny to run again.
__________________
M/Y Dauntless, New York
a Kadey Krogen 42 Currently https://share.delorme.com/dauntless
Blog: https://dauntlessatsea.com
Find us: https://share.delorme.com/dauntless
Wxx3 is offline   Reply With Quote
Old 05-28-2014, 08:28 PM   #16
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,265
The little pump that can (pump and prime):

__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 06-01-2014, 08:34 PM   #17
Member
 
City: St. John USVI
Country: Antigua and Barbuda
Join Date: Oct 2013
Posts: 9
Racor recommends that any electric booster pump be on the suction side of the filter, between the filter and the motor. If you pressurize a Racor they say you will sooner or later blow the seals.
__________________

Itwasntme is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 08:29 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012