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Fuel Tank size #741705
12/05/22 01:22 PM
12/05/22 01:22 PM
Joined: Apr 2012
Posts: 94
God's own county
Sir Percival Offline OP
Just Getting Started
Sir Percival  Offline OP
Just Getting Started

Joined: Apr 2012
Posts: 94
God's own county

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

Re: Fuel Tank size [Re: Sir Percival] #741707
12/05/22 01:44 PM
12/05/22 01:44 PM
Joined: Feb 2010
Posts: 1,369
SimonH Online content
Has a lot to Say!
SimonH  Online Content
Has a lot to Say!

Joined: Feb 2010
Posts: 1,369
Morgan fuel gages are at best vague....

Ive measured a +4 tank at 43 Litres...


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: Fuel Tank size [Re: Sir Percival] #741711
12/05/22 02:45 PM
12/05/22 02:45 PM
Joined: Jul 2007
Posts: 22,628
Suffolk
John V6 Offline
Brooklands Register contact
John V6  Offline
Brooklands Register contact
Member of the Inner Circle

Joined: Jul 2007
Posts: 22,628
Suffolk
They all do that sir. My Roadster gauge is useless. I use the oddometer to judge when to fill


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Fuel Tank size [Re: Sir Percival] #741712
12/05/22 02:47 PM
12/05/22 02:47 PM
Joined: Aug 2020
Posts: 1,099
Lytham St Annes, Lancashire
J
JohnHarris Offline
Has a lot to Say!
JohnHarris  Offline
Has a lot to Say!
J

Joined: Aug 2020
Posts: 1,099
Lytham St Annes, Lancashire
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.


John
2008 Roadster 4 seater FELIX
prev 2006 4/4 70th LOKI
prev 1977 4/4 SEAMUS
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Re: Fuel Tank size [Re: JohnHarris] #741713
12/05/22 03:11 PM
12/05/22 03:11 PM
Joined: Apr 2012
Posts: 94
God's own county
Sir Percival Offline OP
Just Getting Started
Sir Percival  Offline OP
Just Getting Started

Joined: Apr 2012
Posts: 94
God's own county
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!

Re: Fuel Tank size [Re: John V6] #741718
12/05/22 04:32 PM
12/05/22 04:32 PM
Joined: Apr 2012
Posts: 94
God's own county
Sir Percival Offline OP
Just Getting Started
Sir Percival  Offline OP
Just Getting Started

Joined: Apr 2012
Posts: 94
God's own county
Originally Posted by John V6
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 smile

Re: Fuel Tank size [Re: Sir Percival] #741719
12/05/22 04:41 PM
12/05/22 04:41 PM
Joined: Jul 2007
Posts: 22,628
Suffolk
John V6 Offline
Brooklands Register contact
John V6  Offline
Brooklands Register contact
Member of the Inner Circle

Joined: Jul 2007
Posts: 22,628
Suffolk
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
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Fuel Tank size [Re: Sir Percival] #741724
12/05/22 05:58 PM
12/05/22 05:58 PM
Joined: Dec 2009
Posts: 31,031
Devonshire
+8Rich Online content
Tricky Dicky
+8Rich  Online Content
Tricky Dicky
Member of the Inner Circle

Joined: Dec 2009
Posts: 31,031
Devonshire
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.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev





Re: Fuel Tank size [Re: Sir Percival] #741725
12/05/22 06:04 PM
12/05/22 06:04 PM
Joined: Nov 2015
Posts: 5,105
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Charter Member

Joined: Nov 2015
Posts: 5,105
Northern Capital of Cool
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
Re: Fuel Tank size [Re: CooperMan] #741726
12/05/22 06:06 PM
12/05/22 06:06 PM
Joined: Dec 2009
Posts: 31,031
Devonshire
+8Rich Online content
Tricky Dicky
+8Rich  Online Content
Tricky Dicky
Member of the Inner Circle

Joined: Dec 2009
Posts: 31,031
Devonshire
If he has one Jon... Plus Four..


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev





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