 | Home > Technical > Is more apparent power after fueling up a thing? |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17473   
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Depends really how empty the tank was. The Tdci low fuel strategy included inducing a deliberate misfire to encourage the driver to fuel up before running out, since in theory the system won't self prime.
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7th Aug 2016 6:56am |
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| bear100 Member Since: 22 Mar 2010 Location: South Wales Posts: 1921  
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there is a difference in fuels also, cheap supermarket fuel isn't as good as texaco premium
 2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI 2010 Range Rover Sport TDV8 (gone) 2007 Discovery HSE TDV6 (gone) 1993 110 csw 200 tdi (gone) 1994 90 HT 300 tdi (gone) 1994 discovery 300tdi (gone) 90 hybrid 3.5 v8 (gone) Range rover bobtail 3.5 v8 (gone) |
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7th Aug 2016 7:00am |
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| John Fair Member Since: 10 May 2016 Location: Norfolk Posts: 150
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Having personally experienced the puma low fuel strategy I can tell you for sure it isn't subtle and you will know. I don't think this is what your describing.
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7th Aug 2016 7:10am |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 732  
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Might be a vacuum forming in the empty tank. Worth checking breather pipes and fuel cap.
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7th Aug 2016 7:34am |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324 
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Hi guys, I'd never go much past the warning light. Even though I know I've got quite a bit left in there I still treat it as a 'GET FUEL NOW' alarm.
I think the vacuum might have been it... I replaced the breather (and swapped the side it came out from too) and less effect but still some. I buy fuel from the same station usually. I guess my question is does the extra head of fuel affect drivability in any way, or should the system upstream (fuel pump etc) regulate or otherwise make it not noticeable? Solved the bowel problem, working on the consonants... |
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7th Aug 2016 9:02am |
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| pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 
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I don't really know{ disclaimer }
 however wether it is the V8 or Puma if there's a lot of bio in it the thing positively drinks the Stuff! Talked too a few big rig jockeys and they say the same thing, and with them it's dollars and cents. Many drive at night due too cooler air making hundreds of dollars difference in costs. I always get better mpg out of BP, truckers like it too, don't know the cetane value! |
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7th Aug 2016 11:56am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17473
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The level of fuel in the tank should not make any difference at all, provided that the low fuel strategy has not been initiated.
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7th Aug 2016 7:20pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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OK,
Good to know. I wonder then if: The weight of fuel at the rear end is loading up the suspension such that the vehicle feels better to drive? (There is more permanent mass (tools) in there now which might explain why there effect isn't as noticeable anymore) Or: I'm just a sensitive and overanalyzing petal  Solved the bowel problem, working on the consonants... |
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7th Aug 2016 8:40pm |
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| vaucluse Member Since: 04 Feb 2012 Location: SE London Posts: 185 
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Yes, always find power is down when down to last third and when refilled to the top it feels like it has more oomph.
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7th Aug 2016 11:16pm |
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| gilarion Member Since: 05 Dec 2013 Location: Wales Posts: 5111 
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Full tank or nearly empty do not be fooled
Available facts Maybe a Definitive guide to fuel It’s an everyday debate between people, some of who will swear that their Land Rover runs better on fuel from XYZ Company and those who say that all fuel is the same and they just buy the cheapest supermarket fuel. The problem is that most people don’t know how the fuel business works. So let’s start with the simple bit. Premium fuels, such as Shell Nitro and BP Ultimate fuels, these are not the same as regular diesel fuels, we all know that. These ‘super fuels’ cost several pence per litre more than regular because they use a different, more sophisticated package of additives for cleaning and lubrication, and have a higher cetane rating Cetane ratings describe the way a fuel burns inside an engine. Broadly speaking, the higher the rating means a fuel will burn more efficiently and effectively inside your engine. This may improve performance and economy slightly – although not all drivers will see a noticeable difference. No supermarkets presently offer their own super fuels at the pumps, in truth this is because the suppliers will not allow them to buy the fuel with the super package of additives at the refinery. So is the regular diesel sold by supermarkets the same quality as that sold by branded fuel companies like Shell, BP, Esso and Total? Let’s start with some known facts: All diesel fuels sold in the UK must conform to the relevant British Standards. This means that they should all work in roughly the same way and you can mix them freely in your Land Rovers fuel tank. The standard diesel that’s sold on garage forecourts is mixture of two things base fuel and an additive package The base fuel is the same for all companies including supermarkets – in fact it usually comes from the same tanks at the local fuel refinery/distribution centre. What varies is the additives package that goes into the fuel. These additives recipes are a closely guarded secret of extra ingredients that help keep the engine clean and improve lubrication inside the engine cylinders. Each fuel company has its own additive package. So it is possible (but not common) for some Land Rover owners to feel that their car responds better to the additives used by one fuel manufacturer over those of another. So what About Supermarket Fuels? There are all sorts of stories that go round about supermarket fuels, but the fact is that supermarket fuel tankers are filling up from the same tanks as branded fuel tankers e.g. Shell, BP etc. so the chances are that most of the time, the fuel they sell is the same. However, one common story about supermarket fuel is that some supermarkets don’t have a regular fuel supplier. Instead, they buy odd lots of fuel from wherever it’s cheapest though supermarkets deny this. If this does happen and supermarkets swap their suppliers it can lead to supermarket fuel having a more variable set of additives than branded fuels. However Tesco state that their supplier is always ESSO as do Sainsbury. Morrison says their supplier is Total. Right so what do the Supermarkets say Tesco There are minor differences between the additives in regular diesel fuel sold by the different UK retailers. However, I can assure you that it is not correct that Tesco fuel contains inferior additives. In most cases, it will be the same type and dosage of additive that is contained in fuel sold at branded filling stations. I can also confirm that Tesco diesel fuel does not contain less cold flow improver additive in winter compared to branded diesel. Morrison’s Our diesel is supplied to us depending on our stores locality by one of the refiners and blenders that operate in the UK. We only source from established and reputable refiners and blenders Our diesel fuels are manufactured and guaranteed to British Standard EN590, precisely the same specifications that will be found in fuel from branded sellers such as BP, Shell, Esso and Total. These current specifications permit up to 5% renewable content in diesel such as Fatty Acid Methyl Esters (vegetable oil). European law requires all road fuels to contain such renewable feed stocks. Also in relation to the winter fuel I can advise that Cold flow additives in our Diesel guarantee the properties of Diesel down to minus 15 degrees centigrade. The argument Supermarkets state their specifications; on the other hand they are the Minimum requirement specification. So supermarket diesel meets EN950 specification, as I see it that does not automatically make it the same as branded fuels, which may exceed the specifications set for EN950. So the supermarket argument could be flawed. However every refinery or blender of diesel must meet the British Standard and every production batch is tested and certified before release into the supply chain. Typically, at any refinery or oil depot you will witness the tankers of all branded retailers and supermarkets filling from the same common wholesale tanks. So why is Supermarket fuel cheaper, it is because they sell such vast quantities and their operating costs are spread over higher volumes? Plus they also sell thousands of other products so can afford to offer fuel at a discount and offer as a loss leader. Conclusion All diesel filling stations use a standard ‘base’ fuel which is supplied from the same refineries across the UK no matter what pump it will end up being pumped from into your tank. So going off all the known facts, specifications and statement from various supermarkets, it would appear that supermarket regular diesel is the same as branded fuel, the additive package while slightly different in supermarket fuel is on paper just as good as those added to branded diesel, these additives can affect the MPG and general running of the vehicle that some drivers may experience more extremely in some brands than others including supermarket fuel, but in some cases you may not even notice any difference at all. BUT the fuel is all from the same refineries which all meets the same British Standards, so you can use any diesel to fill up your Land Rover knowing it’s all of the same base’ fuel. Supermarkets have recently come in for bad press with the quality of their fuel; however, this is due to contamination in their holding tanks and not on the quality of their base fuel. So there you have it on paper no difference at all with standard diesel. Premium diesel has a better additive recipe, but you pay for it and many swear by it, but you cannot compare super fuels with regular supermarket diesel. Personally I use any fuel. both branded and supermarket. but I always add Millers and my engines run sweet. For those who like Welsh Mountains and narrow boats have a look at my videos and photos at.. http://www.youtube.com/user/conwy1 |
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7th Aug 2016 11:40pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Did you perhaps mean to post in another thread?
I don't understand the relevance. Edit>> ah, I see you're replying to bear100... (yeah?) In the interests of keeping on topic, um, yeah can please keep on topic? Solved the bowel problem, working on the consonants... |
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8th Aug 2016 1:43am |
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| Beery Member Since: 16 Nov 2014 Location: NSW Posts: 36 
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The fuel in a common rail diesel is constantly being circulated through the injection pump and fuel rail and then back to the tank. The fuel gets very hot from the high pressures encountered. Obviously the fuel passes through the fuel cooler on the way back to the tank but this doesnt remove all of the excess heat.
So as the tank gets lower, the fuel is recirculated more and more often and it gets hotter. Ive noticed this on my BAS2 RRC. Fill the tank up and you've got cooler, denser fuel getting to the injectors resulting in less pedal required for the same power. The injector pump also relies on the fuel for cooling, so keeping the tank fuller is a good thing. |
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8th Aug 2016 3:05am |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Interesting...
What values are you testing with your RRC? (I have the same) Solved the bowel problem, working on the consonants... |
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8th Aug 2016 3:07am |
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| Beery Member Since: 16 Nov 2014 Location: NSW Posts: 36
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Just fuel temperature.
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8th Aug 2016 10:45am |
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