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Wales
by Joske Vermeule, September 1
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Forums39
Topics49,901
Posts838,046
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Most Online1,063
Jun 14th, 2026
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Joined: Oct 2014
Posts: 5,017 Likes: 3
Charter Member
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OP
Charter Member
Joined: Oct 2014
Posts: 5,017 Likes: 3 |
I'm not using my M3W every day so it often rests for one or two weeks in the garage.
Today I had a morning tour and suffered strong petrol smell for several minutes while driving but could not find a leak or something unusual.
Starting the engine was unusually fast (only few rotations till the engine fired) and I had strong pertol smell afterwards in the garage and for several miles in the cockpit on the go.
Any proposals where I should search for the reason of the unusual smell?
(The garage floor was dry, no leakage there either) Fuel tank is filled 50%
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
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Joined: Jul 2013
Posts: 1,338
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2013
Posts: 1,338 |
Look just behind the air filter at the hose clamps
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Joined: Nov 2013
Posts: 1,947
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Nov 2013
Posts: 1,947 |
I like Q8 would check the fuel hose clamps. If they are the factory crimped clamps they may be leaking intermittently. I had evidence of fuel on the aero screen but since adding proper screw fuel hose clamps all clear. Cheaper worm drive (jubilee) clamps are not up to the job as they do no tighten evenly round the hose. Not got the car at home but if I remember correctly there is a cross over pipe between both inlets so you need 6 clamps.
Tim
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Joined: Apr 2013
Posts: 1,213
Has a lot to Say!
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Has a lot to Say!
Joined: Apr 2013
Posts: 1,213 |
As Q8 and Tim have suggested it is most likely the hose clamps , for some reason Morgan did not fit the correct ones !
Don't risk driving it if they are the cause , as petrol on the screens makes them craze .
Hugh
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Joined: Oct 2014
Posts: 5,017 Likes: 3
Charter Member
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OP
Charter Member
Joined: Oct 2014
Posts: 5,017 Likes: 3 |
Thank you all for the tips!
I'll check the clamps tomorrow.
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
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Joined: Feb 2012
Posts: 1,664
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Feb 2012
Posts: 1,664 |
If clamps seem to be OK and you had recently fueled up, sometimes if you really top it off you wont get full on vapor lock but as the vehicle sits and pressure is released a small amount of gas can leak from the breather. Which is right behind the seats making the smell strong while sitting in the car compared to it smelling stronger near the engine if the clamps are not functioning. I had to have the clamps replaced as last summer mine started spraying fuel while driving.
Charlie, Former Editor
Morgan Owners Group - Great Lakes
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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 |
I'm not using my M3W every day so it often rests for one or two weeks in the garage.
Today I had a morning tour and suffered strong petrol smell for several minutes while driving but could not find a leak or something unusual.
Starting the engine was unusually fast (only few rotations till the engine fired) and I had strong pertol smell afterwards in the garage and for several miles in the cockpit on the go.
Any proposals where I should search for the reason of the unusual smell?
(The garage floor was dry, no leakage there either) Fuel tank is filled 50% I have a similar scenario after garaging after a long road trip. Garage smells much more than it has before. Will check the hoses too...
M3W5sp 2015, MSCC, MTWC, Oxon UK
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Joined: May 2016
Posts: 541
Talk Morgan Regular
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Talk Morgan Regular
Joined: May 2016
Posts: 541 |
On hot days and stop and go traffic I get fuel coming out of the front of the throttle body.
1998 +8
SS Sport tuned exhaust
2013 M3W
Stage ll motor kit
Cats removed
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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 |
I had what sounds like a similar petrol smell and it was a leaking left hand side petrol tank.
It took several weeks before any fuel dripped onto the garage floor as the tanks are mounted on a plywood base which soaked up the petrol until it became saturated.
Check the front hoses first but if the smell persists then try to get it on a ramp and check the tanks.
Red Leader 
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Joined: Apr 2013
Posts: 1,370 Likes: 11
Has a lot to Say!
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Has a lot to Say!
Joined: Apr 2013
Posts: 1,370 Likes: 11 |
Clamps are the worst offender. Two out of the four were leaking. I did an emergency fix with pipe clamps as I was on the road. Next day I ordered real fuel line clamps as well as a fire extinguisher which is now mounted under the passenger dash.
Having fuel blow into my face and splash on the wind screens is not exactly an encouraging event!
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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