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Fuel Tank Capacity. Again #668987
25/10/20 04:55 PM
25/10/20 04:55 PM
Joined: Apr 2017
Posts: 1,224
Staffordshire
IvorMog Offline OP
Has a lot to Say!
IvorMog  Offline OP
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Joined: Apr 2017
Posts: 1,224
Staffordshire
We have had numerous discussions about tank capacities but I thought I would add some findings from today.

I'm planning to update my fuel system this winter with a new pump and filter, probably a new tank and fuel pressure regulator and possibly a fuel level sensor depending on what I find when I strip the tank out.

Today I went for a run to get as much fuel out as possible and pushed my mileage further than normal to 355 miles from fill up. (I was carrying a spare 5L just in case.)

Now that means that, at 38 mpg, (my long term average) I used just shy of 43 litres.

We have surmised that the 4/4 tank could be as little as 45 litres but I'm pretty sure that if it had been, I would have noticed some starvation under hard acceleration or hard cornering and I'm also pretty sure that the basic square style Morgan tank would not allow it to get down to the last 2 litres before fuel starvation.

So I think we can now surmise that the Handbook stated capacity of 50 Litres might be correct.

However, I have done some fairly accurate measuring and as I am not a complete novice with a tape measure and trigonometry, I sort of trust my calculations.

After 4 separate calculations I was surprised to get between 57 and 60 litres allowing a bit of variation for bend rads and wall thickness etc.

Now here is my question. When Morgan quote fuel tank capacity, I wonder if they mean absolute or useable capacity.

My calc of 57 - 60 litres absolute might indeed give a 50 litre usable capacity which would give me a range of well over 400 miles.

So absolute or usable capacity? What do you think?


Bob

1999 4/4 2 litre Zetec
Re: Fuel Tank Capacity. Again [Re: IvorMog] #668996
25/10/20 05:32 PM
25/10/20 05:32 PM
Joined: Jul 2007
Posts: 18,202
Suffolk
John V6 Offline
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John V6  Offline
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Suffolk
I always thought they quoted 55 l but no idea of the basis. I always assumed that was usable capacity


JohnV6
2006 Indigo Blue Roadster S1
2014 Brooklands Edition Roadster "Brookland's Belle"
Re: Fuel Tank Capacity. Again [Re: IvorMog] #668999
25/10/20 05:41 PM
25/10/20 05:41 PM
Joined: Feb 2010
Posts: 984
SimonH Online content
Talk Morgan Regular
SimonH  Online Content
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Posts: 984
Well I know of over 45 variations of Morgan fuel tank since the mid sixties
And I don’t think they ever changed what was written in the hand book....

Certainly the 70’s 4/4’s and the 2002 on Blacktop Zetec cars are the smallest at around 45 Ltrs


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: Fuel Tank Capacity. Again [Re: IvorMog] #669041
25/10/20 08:57 PM
25/10/20 08:57 PM
Joined: Nov 2018
Posts: 424
Germany, Rhein-Main Area
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xc68anc Offline
Learner Plates Off!
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Germany, Rhein-Main Area
I allways wonder how long I can travel when the yellow light flashes up.

The manual says: from flashing the light to full 40 litres. DTE shows a optimistic number of miles.

Just the last week I found at the a german dealer tech spec: 55litres.

No interest about a test, but it could match the point.

René


2018 plus4
Re: Fuel Tank Capacity. Again [Re: IvorMog] #669043
25/10/20 09:04 PM
25/10/20 09:04 PM
Joined: Sep 2009
Posts: 5,533
Köln Germany
Heinz Offline
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Heinz  Offline
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Posts: 5,533
Köln Germany
René, Flashing light?? My 4/4 has a very precise fuel gauge. For the first 200 km the needle hardly stirs and when it shows one-fourth full, I have to refuel. But a light for the reserve indicator? Has your Morgan Plus 4 been upgraded by NASA?


'14 4/4 graphite grey
Re: Fuel Tank Capacity. Again [Re: IvorMog] #669053
25/10/20 10:35 PM
25/10/20 10:35 PM
Joined: Sep 2011
Posts: 13,775
Mandello del Lario
Gambalunga Offline
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Gambalunga  Offline
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Mandello del Lario
I pretty much emptied the tank in the same way when I was trying to get some fuel gauge calibration. I think mine actually holds about 55 litres which would be 50 litres plus 5 "reserve". I could not get any change in the circuit resistance from about 40 litres up to 50 litres. I just had to settle for the fact that anything over 3/4 of a tank does not register on the gauge. The important thing for me was to have it showing zero when I still had 5 litres usable fuel in the tank. Anything below that is probably contaminated with bits of rubish and below the pump pick up anyway.


Peter

[Linked Image]
Re: Fuel Tank Capacity. Again [Re: IvorMog] #669059
26/10/20 12:25 AM
26/10/20 12:25 AM
Joined: May 2010
Posts: 7,396
Llanelli
sospan Offline
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sospan  Offline
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Joined: May 2010
Posts: 7,396
Llanelli
When I had the 1993 4/4 I had to fit a new fuel pump so flushed the tank. Got some signs of crud out that might have caused the original pump to fail. I fitted an extra filter to protect the new pump.Decided to check the fuel gauge reading. Put 1 gal into the empty tank to see what the gauge reading was as a reference. Just touching the “E”.
I measured the tank and volume was 55 litres. There was a drain plug that made emptying the tank easier.
I haven’t measured the current car tank. Maybe tomorrow.


Red Plus8
Re: Fuel Tank Capacity. Again [Re: Heinz] #669069
26/10/20 06:08 AM
26/10/20 06:08 AM
Joined: Nov 2018
Posts: 424
Germany, Rhein-Main Area
X
xc68anc Offline
Learner Plates Off!
xc68anc  Offline
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Joined: Nov 2018
Posts: 424
Germany, Rhein-Main Area
Originally Posted by Heinz
René, Flashing light?? My 4/4 has a very precise fuel gauge. For the first 200 km the needle hardly stirs and when it shows one-fourth full, I have to refuel. But a light for the reserve indicator? Has your Morgan Plus 4 been upgraded by NASA?


Hello Heinz,

Yes my plus4 shows a BIG SHINY light when the fuel runs empty. It is so shiny that it lights the cabin in the dark.

In cause she‘s a late 2018 model may be the factory uses her as testcar for more hightec. ;-)

No, a joke there is a notice in the handbook. And yes, the gauge is precise, so far I can say. Most time when the light flashes up I can refill about 40litres. But the question was about the capacity.

René


2018 plus4
Re: Fuel Tank Capacity. Again [Re: IvorMog] #669094
26/10/20 10:03 AM
26/10/20 10:03 AM
Joined: Aug 2011
Posts: 2,263
Derby
P
PhilRoyle Online content
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PhilRoyle  Online Content
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Joined: Aug 2011
Posts: 2,263
Derby
The handbook and the specs for my 4/4 sport 2010 (and for all classics at that time ) state 55 litres.


2010 4/4 sport - le mans green
Re: Fuel Tank Capacity. Again [Re: Gambalunga] #669130
26/10/20 12:23 PM
26/10/20 12:23 PM
Joined: Apr 2017
Posts: 1,224
Staffordshire
IvorMog Offline OP
Has a lot to Say!
IvorMog  Offline OP
Has a lot to Say!

Joined: Apr 2017
Posts: 1,224
Staffordshire
Originally Posted by Gambalunga
I pretty much emptied the tank in the same way when I was trying to get some fuel gauge calibration. I think mine actually holds about 55 litres which would be 50 litres plus 5 "reserve". I could not get any change in the circuit resistance from about 40 litres up to 50 litres. I just had to settle for the fact that anything over 3/4 of a tank does not register on the gauge. The important thing for me was to have it showing zero when I still had 5 litres usable fuel in the tank. Anything below that is probably contaminated with bits of rubish and below the pump pick up anyway.


Same here Peter, the gauge never goes over about 3/4 even when brim full. I used to think it was because I wasn't getting a properly filled tank because of an airlock or something. But I disproved that by adding some fuel from a canister and it overflowed after about 1 litre.

However I really can't get my head around the fact that when I put my side lights, and therefore the instrument lights, on the gauge does read close to full.

Same at the empty end. with no lights the gauge reads empty after about 250 / 270 miles whereas with the lights on it doesn't read empty until about 350 miles as per yesterdays tank emptying run.

So it seems that the gauge is more accurate when the lights are on.

I know the gauge is a resistance measuring device and the sender is a variable resistor but why does switching the lights on change the resistance?

The gauge reads higher as the resistance gets lower so it seems that switching the lights on reduces the resistance.

Can any one shed any light on why this might be. I'm a mechanical engineer and I'm very weak on electronic subjects.


Bob

1999 4/4 2 litre Zetec
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