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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Feb 2021
Posts: 185 Likes: 2
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Feb 2021
Posts: 185 Likes: 2 |
I have a 2005 Duratec Plus 4. I am replacing the horrible plastic expansion tank with this Mulfab item but it has one extra exit pipe (circled). Where does it have to go please? ![[Linked Image]](https://www.tm-img.com/images/2023/04/11/Expansiontank.jpeg)
2005 Plus 4
2020 Hyundai eKona
2020 Mitsubishi Outlander PHEV
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Joined: Jun 2015
Posts: 2,094 Likes: 75
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
Posts: 2,094 Likes: 75 |
I am not familiar with the particular tank but looking at the position of that take -off I would expect it to simply connect to an overflow pipe exiting to the atmosphere.
This tank has a conventional pressure cap unlike the original which I would suspect is a modern plastic system with a tiny hole in the plastic cap for venting.
With the conventional spring loaded cap, there is no breather hole in the cap itself, as the sealing washer simply lifts under pressure to a point where it exposes that take off pipe for venting.
Think I would take advice as to what pressure cap is applicable. (unless of course this tank is specified for your particular model)
Think the plastic caps let go at about 21psi.
Last edited by Deejay; 11/04/23 01:25 PM. Reason: broader explanation
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Joined: Feb 2021
Posts: 185 Likes: 2
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Feb 2021
Posts: 185 Likes: 2 |
I am not familiar with the particular tank but looking at the position of that take -off I would expect it to simply connect to an overflow pipe exiting to the atmosphere. This tank has a conventional pressure cap unlike the original which I would suspect is a modern plastic sealed system. Think I would take advice as to what pressure cap is applicable. (unless of course this tank is specified for your particular model) I believe so as I gave Mulfab my car details.
2005 Plus 4
2020 Hyundai eKona
2020 Mitsubishi Outlander PHEV
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Joined: Jun 2015
Posts: 2,094 Likes: 75
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
Posts: 2,094 Likes: 75 |
just modified my original explanation to make it clearer.
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Joined: Jul 2007
Posts: 27,825 Likes: 753
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,825 Likes: 753 |
I think that is an overflow. The plastic ford unit just vents to atmosphere. Run a pipe down to under the car to divert any blow off.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,685 Likes: 414 |
Agreed, it's the pressure cap release overflow. Just route the end of pipe connected to it to a suitable low point. There should rarely be anything come out if the pressure cap is correct.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Nov 2015
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Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,690 Likes: 497 |
Agreed, it's the pressure cap release overflow. Just route the end of pipe connected to it to a suitable low point. There should rarely be anything come out if the pressure cap is correct. Assuming you don't overfill when cold
Jon M
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Member of the Inner Circle
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Member of the Inner Circle
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Agreed, it's the pressure cap release overflow. Just route the end of pipe connected to it to a suitable low point. There should rarely be anything come out if the pressure cap is correct. Assuming you don't overfill when cold The tube runs into the driver's footwell 6 inches above the accelerator pedal. That way you get an immediate warning if the engine overheats 
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Jun 2015
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
Posts: 2,094 Likes: 75 |
Agreed, it's the pressure cap release overflow. Just route the end of pipe connected to it to a suitable low point. There should rarely be anything come out if the pressure cap is correct. Assuming you don't overfill when cold The tube runs into the driver's footwell 6 inches above the accelerator pedal. That way you get an immediate warning if the engine overheats Makes going for a “burn up”, a whole new proposition?
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Joined: May 2007
Posts: 4,612 Likes: 15
Part of the Furniture
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Part of the Furniture
Joined: May 2007
Posts: 4,612 Likes: 15 |
 Agreed, it's the pressure cap release overflow. Just route the end of pipe connected to it to a suitable low point. There should rarely be anything come out if the pressure cap is correct. Assuming you don't overfill when cold The tube runs into the driver's footwell 6 inches above the accelerator pedal. That way you get an immediate warning if the engine overheats
Steve A11OGE Red 1989 4/4 4 seater
'A Morgan is for life, not just for Sundays'
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