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Fuel System Questions #670744
04/11/20 08:46 AM
04/11/20 08:46 AM
Joined: May 2019
Posts: 272
Hampshire, UK
I
IMHO Offline OP
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IMHO  Offline OP
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I

Joined: May 2019
Posts: 272
Hampshire, UK
This is probably a dumb couple of questions but why isn’t the fuel filter in the supply line and what regulates the fuel pressure?


M3W Brooklands (2015)
Moody 41 (2013)
Re: Fuel System Questions [Re: IMHO] #670757
04/11/20 09:57 AM
04/11/20 09:57 AM
Joined: Jun 2012
Posts: 1,535
United Kingdom, Lincolnshire
planenut Offline
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planenut  Offline
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Joined: Jun 2012
Posts: 1,535
United Kingdom, Lincolnshire

I cannot answer why they decided to fit the filter in the return line, it seems mad to me. Possibly the reason was that the filter is also the pressure regulator and that has to be in the return line, its primary purpose is as a regulator to maintain the injector pressure at 58 psi and it also filters the fuel back into the tank.

Re: Fuel System Questions [Re: IMHO] #670764
04/11/20 10:57 AM
04/11/20 10:57 AM
Joined: May 2010
Posts: 7,574
Llanelli
sospan Offline
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sospan  Offline
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Joined: May 2010
Posts: 7,574
Llanelli
I assume you have an M3W. I don’t know the design of the fuel system but I agree that whatever car/engine there is then there should bean in line filter preferably between the tank and pump. This protects everything forward of the filter in the low pressure part of the system. I retro fitted one when I had to replace the failing pump on my then car, a 4/4, and it looked like some bits of solids got into it from the tank. It is a cheap and usually easy job to do. The original filter was forward in the engine bay pre injection. It was left in place as a belt and braces back up.


Red Plus8
Re: Fuel System Questions [Re: IMHO] #670786
04/11/20 12:22 PM
04/11/20 12:22 PM
Joined: Feb 2019
Posts: 2,885
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 2,885
Port Orchard, WA.
And that is why i installed Emil’s fuel system modification. Morgancustom.net has it right and it really works well.


Stephen
2019 M3W, AR Stage 2

Re: Fuel System Questions [Re: IMHO] #670790
04/11/20 12:32 PM
04/11/20 12:32 PM
Joined: Oct 2020
Posts: 79
H
Hogzilla Offline
Just Getting Started
Hogzilla  Offline
Just Getting Started
H

Joined: Oct 2020
Posts: 79
would that upset the pressure to the engine in some way if I installed an inline filter between the pump and the injectors?

Re: Fuel System Questions [Re: IMHO] #670804
04/11/20 01:17 PM
04/11/20 01:17 PM
Joined: Feb 2019
Posts: 2,885
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Posts: 2,885
Port Orchard, WA.
You need regulation.


Stephen
2019 M3W, AR Stage 2

Re: Fuel System Questions [Re: IMHO] #670810
04/11/20 01:28 PM
04/11/20 01:28 PM
Joined: Feb 2018
Posts: 475
SW Iowa, U.S.A.
Bitsobrits Offline
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Bitsobrits  Offline
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Joined: Feb 2018
Posts: 475
SW Iowa, U.S.A.
I wouldn't bother redesigning the fuel system. It works fine, assuming you have a fully functioning fuel pump. Online research will show that a regulator after the injectors is not an uncommon design. There are also systems that have the regulator before the injectors. I cannot find that there is any science behind which is preferable in and of itself. Anecdotes are not enough for me. I like empirical test results, preferably done in a 'one variable at a time' basis on a reliable dynamometer.

There is a filter 'sock' on the pickup side of the fuel pump, but if that is not enough for you, then adding a fuel filter before the injectors won't hurt as long as it flows enough to not introduce significant pressure drop.

Reading forum posts can be dangerous for a new owner, as it can lead you to think there are tons of issues that need to be addressed, right now. There are many reasons, logical and not, why owners mod their machines and you could spend many dollars (and hours of downtime) chasing the latest mod. My advice is to drive and enjoy your machine, addressing faults (if any) as they occur. Take some time to carefully research suggested mods, using this forum AND sources other than this forum for basic tech. As I understand you have a post 2014 machine, you should have little worry.


Steve
2012 M3W



Re: Fuel System Questions [Re: Hogzilla] #670827
04/11/20 02:14 PM
04/11/20 02:14 PM
Joined: Feb 2019
Posts: 1,406
New River Valley, VA
rcmatt Offline
Has a lot to Say!
rcmatt  Offline
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Joined: Feb 2019
Posts: 1,406
New River Valley, VA
Originally Posted by Hogzilla
would that upset the pressure to the engine in some way if I installed an inline filter between the pump and the injectors?



Only if it is too small or clogged up with gunk


Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys
Re: Fuel System Questions [Re: Bitsobrits] #670831
04/11/20 02:23 PM
04/11/20 02:23 PM
Joined: Aug 2019
Posts: 116
Las Vegas
JohnMat Offline
L - Learner Plates On
JohnMat  Offline
L - Learner Plates On

Joined: Aug 2019
Posts: 116
Las Vegas
Originally Posted by Bitsobrits
Reading forum posts can be dangerous for a new owner ... As I understand you have a post 2014 machine, you should have little worry.


I could not agree more. There is a ton of good info here, but as with all internet forums, reading these threads tends to amplify problems.


2020 M3W
Re: Fuel System Questions [Re: JohnMat] #670832
04/11/20 02:34 PM
04/11/20 02:34 PM
Joined: Dec 2017
Posts: 938
Evergreen, Colorado, USA
britmog Offline
Talk Morgan Regular
britmog  Offline
Talk Morgan Regular

Joined: Dec 2017
Posts: 938
Evergreen, Colorado, USA
Originally Posted by JohnMat
Originally Posted by Bitsobrits
Reading forum posts can be dangerous for a new owner ... As I understand you have a post 2014 machine, you should have little worry.


I could not agree more. There is a ton of good info here, but as with all internet forums, reading these threads tends to amplify problems.



Totally agree, I have said before the best advise is to drive your Morgan get used to it and you in it, make notes and then a project list. Otherwise a ton of money is spent and the owner is still not happy.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
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