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by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Nov 2015
Posts: 19
New to Talk Morgan
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OP
New to Talk Morgan
Joined: Nov 2015
Posts: 19 |
I had my M3W parked in my garage with a full tank 100% of 98 octane. No problem, except for a slow motor start. I am always careful to not over fill the tanks. I moved the M3W out onto the street to give access to the garage. My street is level & the day mild & sunny. About 40 minutes later a passing neighbour told me that fuel was pouring out of the rear of the the three wheeler. To gain access I removed the luggage space floor & observed fuel pouring from a vent pipe attached to the pollution control vapour collecting canister. I removed the fuel filler caps & the flow stopped. At the advice of the service agent, I had the M3W towed to their workshop.
They could find nothing wrong with the vehicle.
Apparently with a full tank, liquid fuel can build up in the vapour collecting capsule until it is full when fuel can then syphon out of the fuel tanks.
Advice was to only fill the tanks before I am going on a run.
The hard start problem was solved as their is a vapour vent from the engine to the canister. with a full canister fuel could also flow to the engine causing a rich mixture.
Has anyone had a similar problem? Somewhat alarming.
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Joined: May 2015
Posts: 1,815 Likes: 32
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2015
Posts: 1,815 Likes: 32 |
Is this case of *really full* petrol tanks heating up in the sun, expanding the petrol that then spills out?
M3W5sp 2015, MSCC, MTWC, Oxon UK
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Joined: Oct 2016
Posts: 1,544 Likes: 1
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Oct 2016
Posts: 1,544 Likes: 1 |
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Joined: Jul 2013
Posts: 3,732 Likes: 79
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,732 Likes: 79 |
+1
There’s a known issue with filling to 100% in that it can cause cut-outs and poor running for 5-10 miles.
I always make sure I fill up at least 10 miles from home.
The problem is worse on hot days due to expansion of the fuel.
Red Leader 
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Joined: Nov 2013
Posts: 786 Likes: 18
Talk Morgan Regular
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Talk Morgan Regular
Joined: Nov 2013
Posts: 786 Likes: 18 |
in addition to the problems of engine operation after filling of petrol I had the indicator engine check engine for two days and 150 km.
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Joined: Jul 2012
Posts: 99 Likes: 1
Just Getting Started
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Just Getting Started
Joined: Jul 2012
Posts: 99 Likes: 1 |
I agree. Living in Arizona I tanked up at local station and drove home about 2 miles away. Perhaps 85 degrees at 6 am and around 2 pm went into the garage where the temp. is 110 F or above and there was petrol all over the garage floor.
Scary thing is that I had three battery maintainers on my three Morgans on charge.
Fortunately the garage opener or the gas water heater did not blow the garage to bits. So, 3/4 tank is maximum for me unless driving some distance after re-fuelling!
Tom S
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