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Re: Petrol smell and drip from engine [Re: Bobajobbob] #726071
28/11/21 05:22 PM
28/11/21 05:22 PM
Joined: Apr 2019
Posts: 488
Hertfordshire
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Here is a thread on wet sumping. http://www.talkmorgan.com/ubbthreads.php/topics/290761/1
If you do a search in Google you will usually find something linked to Talk Morgan, quicker than doing the search in TM.

Last edited by Obie; 28/11/21 05:23 PM.
Re: Petrol smell and drip from engine [Re: Bunny] #726076
28/11/21 05:48 PM
28/11/21 05:48 PM
Joined: May 2012
Posts: 340
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Originally Posted by Bunny
Originally Posted by Bobajobbob
When you say "starting the engine after wet sumping" what do you mean?
When the M3W has been standing for an extended time (think weeks) without the engine being run then there is a tendency on many engines for oil to drain from the oil tank, past the oil pump into the crankcase. On my car, around 2 Litres ends up in the wrong place. When the engine is subsequently started, the oil is pumped back up to the oil tank where it belongs. A small amount may also be 'burped' out of the breather pipe which connects the crankcase to the air intake. This can dribble down through the air filter and end up on the floor if it's not all absorbed by the air filter element.

This is a feature of many dry-sump motorcycle engines so we cannot point the finger at MMC this time!


Many thanks. The car hadn't been driven for a couple of weeks so that is a possibility. The fluid did appear to be dripping down from the air filter area although the smell does appear to be more petrol than oil. Of course this being a Morgan there may well be petrol leaking somewhere else and I am being distracted by a more obvious but benign oil leak.


92 Connaught Green Plus 4
Triumph Bonneville 865
Re: Petrol smell and drip from engine [Re: Bobajobbob] #726079
28/11/21 06:06 PM
28/11/21 06:06 PM
Joined: Feb 2019
Posts: 3,713
Port Orchard, WA.
LightSpeed Offline
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Port Orchard, WA.
You could easily have both issues happening. Wet sumping pumping oil into the air cleaner and driping out as well as fuel leaking from the injector tower fuel hoses, or the tower spigots themselves.

Pull the fan to check for fuel leaks as has been said before.

The oil into the air cleaner just gunks up the air cleaner and dumps oil into the intakes causing crud to build up on the pistons, the rear piston in particular.


Last edited by LightSpeed; 28/11/21 06:08 PM.

The light at the end of the tunnel is actually a train. 2019 M3W

Re: Petrol smell and drip from engine [Re: Bobajobbob] #726099
28/11/21 08:11 PM
28/11/21 08:11 PM
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Berkshire, England
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Mark H Offline
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My money is on fuel hose issue - coupling or split plus front engine crank seal or blocked vent.


Got to love the M3W

Re: Petrol smell and drip from engine [Re: Bobajobbob] #726145
29/11/21 02:55 PM
29/11/21 02:55 PM
Joined: Nov 2013
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Aberdeenshire
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Leaking fuel is not good round any engine but if fuel gets on your screens they will go opaque & need changing. I had a leak from the crimped hose connections.

Last edited by TimG; 29/11/21 03:54 PM.
Re: Petrol smell and drip from engine [Re: Bobajobbob] #726203
29/11/21 08:25 PM
29/11/21 08:25 PM
Joined: Sep 2019
Posts: 161
Lot et Garonne, France
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Probably after effects of wet sumping or could be excessively breathing engine (piston rings) that's sending a fine mist into the throttle body/air filter area continuously - when you stop it slowly accumulates to bottom of filter/throttle body and seeps out onto cam chest cover over a couple of days then down onto floor.
Fit a remote catch tank/breather tank which should solve the issue if your that concerned.
Check the fuel hoses as a priority of course but looking at the picture that wouldn't be petrol staining the ground like that.

Re: Petrol smell and drip from engine [Re: Bobajobbob] #726207
29/11/21 09:04 PM
29/11/21 09:04 PM
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Cheers all for all the info and suggestions. While I am at it should I also be checking the fuel tanks? I certainly haven't noticed fuel on the screens so I suppose if there is a petrol leak, above and beyond any oil issues, it could also be happening at the back of the car too?


92 Connaught Green Plus 4
Triumph Bonneville 865
Re: Petrol smell and drip from engine [Re: Bobajobbob] #726209
29/11/21 09:29 PM
29/11/21 09:29 PM
Joined: Jan 2014
Posts: 1,667
Berkshire, England
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Fuel tanks crack around the mount points - forget to add that one to the list - The fuel spray cracked my screens too

Re: Petrol smell and drip from engine [Re: Bobajobbob] #726346
01/12/21 10:43 PM
01/12/21 10:43 PM
Joined: Sep 2019
Posts: 161
Lot et Garonne, France
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For fuel tank leaks, quickest way to see is look at the wood 'protection' pieces underneath and see if they are stained.
Just have a car here now where the bottom seam weld has a crack running along it....wood heavily stained....

Re: Petrol smell and drip from engine [Re: Bobajobbob] #726351
02/12/21 01:02 AM
02/12/21 01:02 AM
Joined: Feb 2019
Posts: 3,713
Port Orchard, WA.
LightSpeed Offline
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the tank fill tube weld to the tank can leak too.


The light at the end of the tunnel is actually a train. 2019 M3W

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