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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Apr 2012
Posts: 184 Likes: 16
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2012
Posts: 184 Likes: 16 |
Tried a little test on our new Plus Four. The handbook says the tank holds 43 litres and that a warning light will come on when approximately 6 litres remain. We carried on for another 40 miles after this point, approx 4.5 litres, which meant we should have 1.5 litres left. The gauge was now right on the empty mark and we dare not go any further as there is a warning in the handbook to not let the vehicle run completely out of fuel as this may damage the engine and other components.
We thought we must have been running on fresh air at this point and were somewhat baffled when we pulled into a service station and only managed to squeeze in 31.03 litres rather than the 41.5 litres we were expecting.
Is the size of the tank overstated or do we have a duff one?
Sir P
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
Posts: 1,415 |
Morgan fuel gages are at best vague....
Ive measured a +4 tank at 43 Litres...
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: Jul 2007
Posts: 27,817 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,817 Likes: 749 |
They all do that sir. My Roadster gauge is useless. I use the oddometer to judge when to fill
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Aug 2020
Posts: 3,854 Likes: 401
Talk Morgan Addict
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Talk Morgan Addict
Joined: Aug 2020
Posts: 3,854 Likes: 401 |
Whilst you might not have been able to fill it up as much as you estimated, you car is probably doing more MPG than you first thought. I find my fuel gauge can drop suddenly within a few miles, then as soon as I find a constant speed it rises again. At best the fuel gauge is an indication of some petrol in the tank, often beyond that hopeful note of optimism , I tend to rely more on the miles travelled since last fill up and my conservation MPG estimate as my more reliable gauge of remaining fuel, as I don't need the onset of remaining range anxiety.
22 Plus Four KIMI
12 Plus 4 Sport OZZY
08 Roadster FELIX
06 4/4 70th LOKI
77 4/4 SEAMUS
85 4/4 MOLLY
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Joined: Apr 2012
Posts: 184 Likes: 16
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2012
Posts: 184 Likes: 16 |
On that particular test we had done 280 miles and used 31.03 litres (= 6.83 gallons) which equates to 41.02mpg
If as you say the fuel gauge is somewhat iffy that would mean I could have gone for a further 100 miles (43litres = 9.46 gallons @ 40 mpg = 380 miles).
Would you have carried on with the fuel warning light flashing and the fuel gauge showing empty for a further 100 miles. Surely the fuel gauge can't be that far out.
Interestingly on our previous Morgan a 3.7 Roadster the fuel gauge and miles left indicator were extremely accurate, I would have trusted them with my life!
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Joined: Apr 2012
Posts: 184 Likes: 16
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2012
Posts: 184 Likes: 16 |
They all do that sir. My Roadster gauge is useless. I use the oddometer to judge when to fill Which is fine if you know how much the tank holds, that's what I am trying to find out 
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Joined: Jul 2007
Posts: 27,817 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,817 Likes: 749 |
I thought you just did or did you not note the mileage? I just fill every 200-220 miles as the avg mpg is around 29. Yours should be far higher of course.
I guess you are after the real end mileage possible, I just don't take the risk and start looking after 200 miles.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Dec 2009
Posts: 37,435 Likes: 980
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,435 Likes: 980 |
I do as John does and fill up at 200 miles knowing I probably have another 50 miles in hand at 23mpg with my 1999 Plus 8 - as the fuel tanks appear to vary if you really must know the capacity fill it up and pump it out using a small 12 volt pump and 5 gallon drums it will be the only way to know.
Most of us run on the odometer method I think you'll find.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Nov 2015
Posts: 8,684 Likes: 493
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,684 Likes: 493 |
Take out the spare wheel, accurately measure the tank and cube up it's volume, however as some have found you can't always get a Morgan tank properly full due to venting issues as you pump petrol in
Jon M
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Joined: Dec 2009
Posts: 37,435 Likes: 980
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,435 Likes: 980 |
If he has one Jon... Plus Four..
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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