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Vapour Lock today in the TR4 Mog #653597
31/07/20 08:19 PM
31/07/20 08:19 PM
Joined: Jan 2013
Posts: 807
UK
BuyBritish Offline OP
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BuyBritish  Offline OP
Talk Morgan Regular

Joined: Jan 2013
Posts: 807
UK
Yep had to slow in trafic and the running went rather nasty and rough...turned out to be vapour lock so we cooled the fuel lines with cool water and we were ok again.

A number of fixes are

Insulate the fuel pipes in the engine bay from heat

Fit a heat sheild between the exhasut and intake headers

Dont use the low octanne fuel as the ethanol causes vapour locks

Dont drive in hot weather and sit in traffic...


Rob Davies
Morgan 3 Wheeler 1934 MX
Morgan Series 1 1947
Morgan +4 1956 TR4
Morgan +4 2000 T16 Rov
Re: Vapour Lock today in the TR4 Mog [Re: BuyBritish] #653710
01/08/20 05:14 PM
01/08/20 05:14 PM
Joined: Sep 2014
Posts: 1,701
London
MOG 615 Offline
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Joined: Sep 2014
Posts: 1,701
London
Rob,

Are you using the mechanical pump on the left side of the engine, if so the cure is to convert to an electric pump with a fuel pressure regulator in the line.

Not sure of the current nomenclature but I used a Facet Silver Top (high volume NOT high pressure) pump, and a Malpassi filter King pressure regulator.

It was flipping hot today , we were crawling along in the +8 back to SE London in traffic and the electric fan was on the whole time and still the coolant temperature was indicating in the high 90s.


Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
Re: Vapour Lock today in the TR4 Mog [Re: BuyBritish] #653758
01/08/20 09:29 PM
01/08/20 09:29 PM
Joined: Jan 2013
Posts: 807
UK
BuyBritish Offline OP
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BuyBritish  Offline OP
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UK
It was only the hot weather that gave me problems, yes im using the mechanical pump...


Rob Davies
Morgan 3 Wheeler 1934 MX
Morgan Series 1 1947
Morgan +4 1956 TR4
Morgan +4 2000 T16 Rov
Re: Vapour Lock today in the TR4 Mog [Re: MOG 615] #653762
01/08/20 10:20 PM
01/08/20 10:20 PM
Joined: Aug 2015
Posts: 894
A
Arwyn Williams Offline
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Arwyn Williams  Offline
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Joined: Aug 2015
Posts: 894
Andy

Silver Top is the fast road pump and Red Top is the competition one.

I'd agree that Silver Top is the one to use given that SU's don't need a lot of pressure - 1.5 to 2 psi is ample.

I've never been able to reduce the pressure on Red Top with a Filter King below 2psi.

As well as the pump and the pressure regulator, add the setting gauge to the shopping list!!

Hot yesterday on my run down to Malvern in the 4/4 but the Kenlowe only came on twice!!

Arwyn

Last edited by Arwyn Williams; 01/08/20 10:26 PM.
Re: Vapour Lock today in the TR4 Mog [Re: BuyBritish] #653763
01/08/20 10:24 PM
01/08/20 10:24 PM
Joined: Sep 2010
Posts: 1,844
Wales
T
Taffmog Offline
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Taffmog  Offline
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T

Joined: Sep 2010
Posts: 1,844
Wales
I think you should certainly be using a head shield Rob, or maybe wrap your exhaust manifold. Most TR owners wrap them, including myself, owing to high under bonnet temperatures.
I use top quality fuel , usually Shell V Power, in all the Mogs, Considering my annual mileage no point in trying to economise.


1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
Re: Vapour Lock today in the TR4 Mog [Re: Taffmog] #653764
01/08/20 10:28 PM
01/08/20 10:28 PM
Joined: Aug 2015
Posts: 894
A
Arwyn Williams Offline
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Arwyn Williams  Offline
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A

Joined: Aug 2015
Posts: 894
Originally Posted by Taffmog
I think you should certainly be using a head shield Rob, or maybe wrap your exhaust manifold. Most TR owners wrap them, including myself, owing to high under bonnet temperatures.
I use top quality fuel , usually Shell V Power, in all the Mogs, Considering my annual mileage no point in trying to economise.


Bit difficult to wrap the cast iron TR manifold Brian!!

Arwyn

Re: Vapour Lock today in the TR4 Mog [Re: BuyBritish] #653766
01/08/20 10:52 PM
01/08/20 10:52 PM
Joined: Sep 2010
Posts: 1,844
Wales
T
Taffmog Offline
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Taffmog  Offline
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T

Joined: Sep 2010
Posts: 1,844
Wales
Yes!, Most owners have replaced them with a decent SS free flow by now, a worthwhile mod.


1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8

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