Cruisers Forum

Thread Tools Search this Thread Rate Thread Display Modes
Old 28-07-2018, 12:15   #1
Registered User

Join Date: Oct 2009
Location: So Cal
Boat: one-off 45' glass cutter, home-built, "ORION"
Posts: 1
Diesel fuel return ?

I have a 4 cylinder ford Lehman diesel. The day tank is located 4 feet above the motor. Can I route the fuel return line that high ? Will the fuel pump up that high ?. Also, if it will, when the motor is shut down, what happens to the fuel remaining in the line ? Will the fuel leak past the injectors and into the cylinder ? Thank you in advance...... Don in So. Cal.
Don Mitchell is offline   Reply With Quote
Old 28-07-2018, 12:27   #2
Registered User

Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
Re: Diesel fuel return ?

Unless you have a bad injector, it will not leak into the engine. It takes like 1500 psi to open an injector. The return fuel will have no problem getting back to the tank
model 10 is offline   Reply With Quote
Old 28-07-2018, 12:46   #3
Registered User

Join Date: Nov 2014
Posts: 1,478
Re: Diesel fuel return ?

Might be better to return the fuel back to the main fuel tank...
- Eliminates any question of fuel leaking back thru the injection system
- Gives the fuel more time to get rid of any heat it has picked up when traveling thru the injection system

DougR is online now   Reply With Quote
Old 28-07-2018, 12:55   #4
Registered User
travellerw's Avatar

Join Date: Jan 2014
Location: Martinique
Boat: Fortuna Island Spirit 40
Posts: 2,298
Re: Diesel fuel return ?

ECOS is right..

Our boat was built with both fuel tanks above the motors (about 3ft). Been like that for 14 years.

On the upside, I NEVER have to bleed my motors. I simply open all the valves and wait 30 minutes. Gravity does all the work for me. The air is pushed into the bleed line. On first rotation they will fire, sputter, then catch and we are off.
travellerw is offline   Reply With Quote
Old 29-07-2018, 08:27   #5
Registered User
mvmojo's Avatar

Join Date: Mar 2018
Boat: Robt Beebe Passagemaker 49-10 in steel
Posts: 424
Re: Diesel fuel return ?

There is very little fuel return on a Ford Lehman. Route it back to the main tank rather than the day tank. That eliminates any/all concerns and what little return there is is good clean fuel going back into your main tank.
mvmojo is offline   Reply With Quote
Old 29-07-2018, 11:19   #6
Registered User

Join Date: Sep 2014
Posts: 236
Re: Diesel fuel return ?

If the return fuel line is plumbed to a tank other than that which is providing the supply, you'll prematurely exhaust the fuel in the latter and, depending on the level of fuel in the former, overfill it.
boatman1 is offline   Reply With Quote
Old 29-07-2018, 15:42   #7
Registered User

Join Date: Sep 2007
Location: Queensland, Australia
Boat: None at present--between vessels. Ex Piver Loadstar 12.5 metres
Posts: 1,475
Re: Diesel fuel return ?

I simply return mine to the fuel filter via an automotive transmission cooler radiator, since the fuel is no longer under high pressure. It cost $100 new. but from a wreckers $20. Only in the tropics or with a very short return line would one even need a cooler. I hang mine below a beam, so it has air both sides, convection cooled.

If you get a second hand one--wash it thoroughly with a few changes of petrol and blow it dry.
Mike Banks is offline   Reply With Quote
Old 29-07-2018, 18:54   #8
Registered User

Join Date: Oct 2009
Location: Los Angeles, CA
Boat: Catalina 42 MK I
Posts: 203
Re: Diesel fuel return ?

Hi Don from Tahiti!!
Wht boatman one said. I recently forgot to switch my return to the sending tank and nearly overfilled one tank and emptied the sending tank.
And it’s just not true that ford Lehman doesn’t return much. My 6 cal sure does anyway.
Left you a ph msg this morning! Come see us in Tahiti!!
Geoff H. is offline   Reply With Quote

diesel, fuel

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Does diesel fuel return line have to be above fuel tank? er9 Engines and Propulsion Systems 31 01-06-2018 13:59
Diesel Return Fuel Line Question LA-Sailor Engines and Propulsion Systems 13 23-06-2017 21:45
Diesel Fuel Tank vs Portable Diesel Fuel Cell GaryMayo Engines and Propulsion Systems 11 13-11-2012 16:47
fuel return line Han Engines and Propulsion Systems 17 17-06-2008 02:58

Advertise Here

All times are GMT -7. The time now is 16:15.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.