Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-12-2019, 09:48 AM   #1
Guru
 
mike66's Avatar
 
City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 523
Fuel return line on Lehman 135SP

Does anyone know if the return has to go back to the tank, or if it can be looped back into the supply line before the pump?
Thanks.
mike66 is offline   Reply With Quote
Old 06-12-2019, 10:31 AM   #2
Guru
 
Airstream345's Avatar
 
City: Friday Harbor, WA USA
Vessel Name: FORTITUDE
Vessel Model: Kadey Krogen 54-8
Join Date: Jul 2017
Posts: 1,015
Mike what are you trying to accomplish? My sense is that you wouldn’t want any back pressure on the return line.
__________________
FORTITUDE
Blog: mvfortitude.com
Instagram: @mvfortitude
Airstream345 is offline   Reply With Quote
Old 06-12-2019, 11:18 AM   #3
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
Go back to the tank. Part of the purpose of the return is to get rid of any air that might get into supply, route return to supply and air will have no where to go.

Also some engines use the return to take some heat away from inj system.
Ski in NC is offline   Reply With Quote
Old 06-12-2019, 11:51 AM   #4
Guru
 
mike66's Avatar
 
City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 523
I'm re-plumbing due to a fuel tank leak, and the present return line goes into a T with the generator supply line, which comes off the good tank. I need to tap off the same supply line to get fuel to the Lehman, since the present supply line for it comes off the leaking tank. Both tanks interconnect at the bottom to keep the boat trimmed, but luckily have shut-offs so I can isolate the tanks.
I'll just return to the tank to be on the safe side.

Thanks.
mike66 is offline   Reply With Quote
Old 06-12-2019, 12:42 PM   #5
Guru
 
kchace's Avatar
 
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
Quote:
Originally Posted by Ski in NC View Post
Go back to the tank. Part of the purpose of the return is to get rid of any air that might get into supply, route return to supply and air will have no where to go.

Also some engines use the return to take some heat away from inj system.



This is especially true for an engine like the FL135 which has an "auto bleeding" injection pump (which BTW works really well). That air has to go someplace and it shouldn't be sent back to the input. There are 2 return lines, one from the injection pump and one from the injectors. They typically T together and then should go back to the tank.



Ken
kchace is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 01:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012