tank size and instrument reading

lukewilliam1_75

lukewilliam1_75

Member
What is the standard size tank in a 75 3500? How many litres until you get to full normally?

Is Full just past the white marker at the end or the very very end white marker at the end?
 
I must admit I've never actually filled the tank to the brim... Would cost a fortune by my reckoning!
 
Hi Luke,

Total tank capacity which includes the reserve is 68 litres. With my Rover, bringing the fuel level up so that it is just visible when looking in sees the needle right at the very end of the white section. There is parallax error involved here, so where the needle sits in relation to the white section is dependent upon where you view the gauge.

If you fill your tank to a known level such as what I do, then you'll see where the gauge reads in relation to that level.

Ron.
 
rockdemon said:
68 litres is £91.... That's why I've not done that!
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I haven't done it in a long long time either :( Damn George Bush senior and Junior.

Graeme
 
Hi Ron, and all others,

Agree that it does cost an arm and a leg to fill it up to the top, but boy its fun driving it, so in that case, its well worth it!

I understand what you mean by saying that it depends where you stand, however, from what i get, i only get it up to 3/4 of a tank compared to another p6 driver i know but - recipt states about 40 litres- just about on what i belive to be empty and when you fill it up i can fill it right to the top of the petrol cover, any ideas??????

it does like to back wash a bit too when filling.

How much differnece does octane booster make?
 
rockdemon said:
68 litres is £91.... That's why I've not done that!
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Thats only 3 x £30 top ups :wink:
Doesnt do it good to run tank low all the time as you can pick up crap,even filters can get blocked!!
If I do ever run it down to the res tap it then takes about 55l to fill up.
I put in £25 worth every 2 weeks,and by end of 2 months its almost full,but if ever going on a trip I always fill it right up,as you never know what may happen,and the price might be higher wherever I am going.
My guage seems to take a while to get down to 1/2 way then speeds up till just before the empty mark,probably just down to age and wear in the guage and sender.
At least the free tax on pre 73 cars and cheap insurance make up for the fuel cost a bit! :wink:
 
lukewilliam wrote,...
from what i get, i only get it up to 3/4 of a tank compared to another p6 driver i know but - recipt states about 40 litres- just about on what i belive to be empty and when you fill it up i can fill it right to the top of the petrol cover, any ideas??????
Click to expand...

So if I understand you correctly Luke, from essentially empty till full for your tank is 40 litres. If that is indeed the case, then at some time in the past your fuel tank has either been replaced with a smaller unit, or the existing tank has been modified so as to reduce capacity.

When you were emptying the tank, did you let it run right out of fuel on the main line and then switch over to reserve? How long or rather how far did you drive on reserve prior to filling?

Ron.
 
70 litres / 15 gallons is written on my fuel gauge at the bottom??
And I've squeezed in 61 litres of tesco's momentum in to get the benifit of 15p a litre off using the 5p off vouchers x 3. :D
 
SydneyRoverP6B said:
lukewilliam wrote,...
from what i get, i only get it up to 3/4 of a tank compared to another p6 driver i know but - recipt states about 40 litres- just about on what i belive to be empty and when you fill it up i can fill it right to the top of the petrol cover, any ideas??????
Click to expand...

So if I understand you correctly Luke, from essentially empty till full for your tank is 40 litres. If that is indeed the case, then at some time in the past your fuel tank has either been replaced with a smaller unit, or the existing tank has been modified so as to reduce capacity.

When you were emptying the tank, did you let it run right out of fuel on the main line and then switch over to reserve? How long or rather how far did you drive on reserve prior to filling?

Ron.
Click to expand...

G'day Ron,
about 40 litres @ $60 to $70 buck to fill, but as i said, it doesnt read full it reads at 3/4 would this be the case if the tank has been changed, that the 3/4 is infact my full marker? I ran it right down so i couldnt start it, i went to pull the reserve and then i got nothing, so to answer your question, i didnt drive any distance as the reserve didnt work. could there be a blockage or anthing in the tank? Is there any way other then running it to empty to see if the petrol reserve is working?

Also how much difference does octane booster make?
 
I'm only bothered when it reads empty that it is empty (if that makes sense) :) as I know when I've just filled it :mrgreen:

I always make sure my senders do that and then they'll read full when full as a rule, unless someone has been messing :wink:
 
Lukewilliam wrote,...
G'day Ron,
about 40 litres @ $60 to $70 buck to fill, but as i said, it doesnt read full it reads at 3/4 would this be the case if the tank has been changed, that the 3/4 is infact my full marker? I ran it right down so i couldnt start it, i went to pull the reserve and then i got nothing, so to answer your question, i didnt drive any distance as the reserve didnt work. could there be a blockage or anthing in the tank? Is there any way other then running it to empty to see if the petrol reserve is working?
Click to expand...

G'day Luke,

With the V8 tank you should see some 56 litres withdrawn prior to running dry on the main line, the reserve once brought into action allowing the final 12 litres or so to be accessed. To obtain a better picture of what is going on, can you remove the fibre board that covers the tank at the back of the boot and take some photos and post them Luke? That will help to establish if your tank has been changed in some way.

The sender within the tank that registers fuel level contains a float which, should it take on fuel will lead to false readings being displayed on the gauge. A full tank will register less so as the float will no longer rest on the level of fuel but rather below. In addition, the arc through which the float travels is calibrated to suit the size of the V8 tank so that the gauge reads with a certain degree of accuracy. If your tank has been modified, then that will also help to explain the less than full reading displayed by the gauge.

Also how much difference does octane booster make?
Click to expand...

An octane booster will lift the nominal octane rating of the fuel by a certain amount. They make the most difference with the 10.5 : 1 engines, less so with your engine which would or should be a 9.25 : 1.

Ron.
 
HI Ron, some pics as requested

What are your thoughts?


Cheers
 

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Hi Luke,

:shock: Well, that is the first time that I have seen that arrangement on a P6B in Australia. According to the parts book, the catch tank,..(the little tank in front of the main tank) was standard fitment on models for both the Japanese and U.S markets only. The tank also has a different part number. Your engine I assume is fitted with charcoal canisters etc?

Does your fuel gauge have 4 small rectangles in a straight line, smallest,..two larger and the same size and finally an in between size? When full the needle aligns with the end of the final rectangle, mine does at any rate.

Very curious... :?

Ron.
 
Luke

My blue car (as an English spec import) had the two tanks. It seems that the little tank is part of the vapour trap and is connected to the charcoal cannisters under the bonnet to catch fumes or something. My other car (Pooh) never had that arrangement (Australian spec) but now has a 75l foam filled fuel cell instead :p

Hopes this helps, but I have been known to be wrong occassionally :wink:

Cheers

GUY :D
 
Hi Ron,

I was sent this info from a guy at the Rover Car Club- might also be of some interest

Your Vin number indicates that your car is a RHD CKD NZ built. The last recorded Commission number from the plant was 45304112E (i.e. there were 248 more cars built after yours). He says 'Unless some numbers were not used there must therfore have been at least 4,112 RHD CKD 3500 Mk II cars built (in NZ)'.

Re. your engine. It appears you are correct in saying it has been replaced as the number 45113583D incates it comes from a 'home market' car (full import I guess) made between Aug 70 and Dec 74 where the engines between 45100001-45126536 were made.- and correct Ron, it does have 2 charcol canisters fitted!

Fitted with Borg Warner 65 gearbox.

Also i found out that my engine was previously registered with the rover car club, owned since 1984 and reg to the club up til around 1998- the car was recorded as a 1974 p6b- my understanding was that the guy i brought if off recently was going to restore it but never got around to it, so i have a 1974 engine and a 1975 body.

I have also taken a photo of my fuel gauge, i have marked with a green x - or best of could do freehand where it fills to, it wont go any higher than that. It just gets the the very start of the next white rectangle but thats it, no more

Would the tank be an original 68 litre tank?
 

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Guy Engelsman said:
Luke

My blue car (as an English spec import) had the two tanks. It seems that the little tank is part of the vapour trap and is connected to the charcoal cannisters under the bonnet to catch fumes or something. My other car (Pooh) never had that arrangement (Australian spec) but now has a 75l foam filled fuel cell instead :p

Hopes this helps, but I have been known to be wrong occassionally :wink:

Cheers

GUY :D
Click to expand...

Thanks Guy, interesting stuff, definetly helps, great thing about this forum is it doesnt really matter if your wrong as at least you have lots of things to base conclusions on!!!
 
Guy Engelsman said:
Luke

My blue car (as an English spec import) had the two tanks. It seems that the little tank is part of the vapour trap and is connected to the charcoal cannisters under the bonnet to catch fumes or something. My other car (Pooh) never had that arrangement (Australian spec) but now has a 75l foam filled fuel cell instead :p

Hopes this helps, but I have been known to be wrong occassionally :wink:

Cheers

GUY :D
Click to expand...

Thanks Guy, interesting stuff, definetly helps, great thing about this forum is it doesnt really matter if your wrong as at least you have lots of things to base conclusions on!!!
 
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