"Reserve" tank

nothing to argue about, there are two tanks in the e30 BMW, this is fact

I suppose trolls will want to argue about everything, including facts.
 
symantics, once the light goes on you're in reserve tank mode...
Light goes on around 10% of fuel left of total fuel capacity.
 
BMW E30 Specs ( Specifications )

Model 318i 318i / is / iC 325 / 325e 325es 325 325i 325is 325ix 325iC
Year 84 - 85 90-91 84-87 86-87 88 87-91 87-91 88-91 87-92
. . . eta eta supereta . . 4wd convertible
HP / RPM sae net 101 / 5800 134 / 6000 121 / 4250 121 / 4250 127 / 4800 168 / 5800 168 / 5800 168 / 5800 168 / 5800
Torque / RPM [lbs.-ft] 103 / 4500 127 / 4600 170 / 3250 170 / 3250 170 / 3200 164 / 4300 164 / 4300 164 / 4300 164 / 4300
Engine M10 B18 M42 B18 M20 B27 M20 B27 M20 B27 M20 B25 M20 B25 M20 B25 M20 B25
Configuration in-line in-line in-line in-line in-line in-line in-line in-line in-line
Number of cylinders 4 4 6 6 6 6 6 6 6
. 1.8 L 1.8 L 2.7 L 2.7 L 2.7 L 2.5 L 2.5 L 2.5 L 2.5 L
Performance . . . . . . . . .
0-30 mph [sec] 3.4 ? 2.6 ? ? 2.4 ? 2.7 ?
0-60 mph [sec] 11.6 9.7 9.5 (w man. trany); 11.5 (w auto trany) ? 8.8 7.6 ? 8 ?
0-80 mph [sec] ? ? 21.3 ? ? 16.9 ? 17.4 ?
0-90 mph [sec] 32 ? 30 ? ? 22.8 ? 23 ?
1/4 mile [sec]@mph 18.3 / 74.0 17.3 /- 16.8 / 81.5 ? ? 15.8 / 86 ? 16.0 / - ?
Maximum mph 111 122 115 ? 122 128 ? 128 ?
Fuel economy or consumption [mpg] 27 / 38 - manual ( 34 auto ) 21/27 21/28 ? 21/28 21/23 ? 19/21 ?
Weight - curb [lb] 2360 4dr: 2657; is: 2602; conv: 2867 2770 2785 2765 (2 door); 2209 (4 door) 87-88 : 2850; 89: 2895; 90-91: 2811 87-88: 2815; 89-91: 2865 3010 87-90: 3015; 91-92: 2988
DME (computer) Bosch Bosch Bosch Bosch Bosch Bosch Bosch Bosch Bosch
DME Manufacturer P/N - 0-261-200-175 84: 0-261-200-021; 85-on: 0-261-200-027 0-261-200-027 0-261-200-154 0-261-200-153; 0-261-200-173; 0-261-200-351; 0-261-200-380; 0-261-200-382; 0-261-200-524; 0-261-200-525; 0-261-200-526 0-261-200-153; 0-261-200-173; 0-261-200-351; 0-261-200-380; 0-261-200-382; 0-261-200-524; 0-261-200-525; 0-261-200-526 0-261-200-153; 0-261-200-173; 0-261-200-351; 0-261-200-380; 0-261-200-382; 0-261-200-524; 0-261-200-525; 0-261-200-526 0-261-200-153; 0-261-200-173; 0-261-200-351; 0-261-200-380; 0-261-200-382; 0-261-200-524; 0-261-200-525; 0-261-200-526
Designation (M= Motronic ) L-Jetronic M1.7 Basic M1.0 Basic M1.0 M1.1 M1.1 ; M1.3 M1.1 ; M1.3 M1.1 ; M1.3 M1.1 ; M1.3
Capacities . . . . . . . . .
Fuel Tank [L] (or gallons) 55 (14.5) 62 (16.4) 55 (14.5) 55 (14.5) 62 (16.4) 55 (14.5) ; 62 (16.4) 55 (14.5) ; 62 (16.4) 62 (16.4) 55 (14.5) ; 62 (16.4)
Engine Oil - with filter change [L] 4 4.5 4.25 4.25 4.25 4.25 4.25 4.25 4.25
Cooling System [L] 7 7 11 11 11 10.5 10.5 10.5 10.5
Auto transmission [L] 2 1.2 3 3 3 3 3 3 3
Manual transmission [L] 1.05 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25
Final drive [L] 0.9 0.9 1.7 1.7 1.7 1.7 1.7 Transfer case 1.5 pint of ATF; 1.7 1.7
Motor M10 B18 M42 B18 M20 B27 M20 B27 M20 B27 M20 B25 M20 B25 M20 B25 M20 B25
Compression 9.3:1 10.0:1 9.0:1 9.0:1 8.5:1 8.8:1 8.8:1 8.8:1 8.8:1
Displacement [cm3] 1766 1796 2693 2693 2693 2494 2494 2494 2494
Idle Speed [RPM] 850 ± 50 850 ± 40 700 ± 50 700 ± 50 720 ± 40 760 ± 40 760 ± 40 760 ± 40 760 ± 40
Max permited engine speed [RPM] - 6500 ± 40 4750 4750 5300 6200 6200 6200 6200
Continous engine speed limit [RPM] - 6300 ? ? ? 6000 6000 6000 6000
Spark Plug gap [mm] 0.8 - 0.9 Non-adjustable 0.7 - 0.8 0.7 - 0.8 0.7 - 0.8 0.7 - 0.8 0.7 - 0.8 0.7 - 0.8 0.7 - 0.8
Firing Order 1 - 3 - 4 - 2 1 - 3 - 4 - 2 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4
Bore [mm] 89 84 84 84 84 84 84 84 84
Stroke [mm] 71 81 81 81 81 75 75 75 75
Head Casting # ? ? 1-264-200 1-264-200 1-705-885 1-705-885 1-705-885 1-705-885 1-705-885
Intake runner length [mm] ? ? 553 553 ? ? ? ? ?
Chamber Vol ~ [cc] ? ? ? ? ? 40 40 40 40
Intake Valve [mm] 46 33 40 40 42 42 42 42 42
Exhaust Valve [mm] 38 30.5 34 34 36 36 36 36 36
Valce clearnce cold/warm [mm] 0.20 / 0.25 Hydraulic Adjusters 0.30/ 0.25 0.30/ 0.25 0.30/ 0.25 0.30/ 0.25 0.30/ 0.25 0.30/ 0.25 0.30/ 0.25
Valve Adjusting sequence 1-3-4-2 1-3-4-2 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4 1 - 5 - 3 - 6 - 2 - 4
Camshaft configuration SOHC DOHC SOHC SOHC SOHC SOHC SOHC SOHC SOHC
Valves per cylinder 2 4 2 2 2 2 2 2 2
Total number of valves 8 16 12 12 12 12 12 12 12
Cam Drive Chain Chain Belt Belt Belt Belt Belt Belt Belt
Cam Duration [deg] ? ? 236 236 ? 256 256 256 256
Cam Lift [mm] ? ? 9.1 9.1 ? 10.1 10.1 10.1 10.1
Cam LCA [deg] ? ? 102 102 ? 108 108 108 108
Number of cam bearings ? ? 4 4 ? 7 7 7 7
Connecting Rod (Center) ? ? 130 130 130 135 135 135 135
Crank Bearing ? ? 45 45 45 45 45 45 45
Pin Bearing ? ? 22 22 22 22 22 22 22
Manual Transmission ( Gearbox ) Getrag 240 Getrag 260 Getrag 260 Getrag 260 Getrag 260 Getrag 260 Getrag 260 Getrag 260 Getrag 260
Manual tranny ratios (1/2/3/4/5/R) 3.72 / 2.02 / 1.32 / 1.00 / 0.81 / 3.45 3.72 / 2.02 / 1.32 / 1.00 / 0.80 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71 3.83 / 2.20 / 1.40 / 1.00 / 0.81 / 3.71
Automatic Transmission ( Gearbox ) ZF 3 HP 22 or 4HP 22 H - 4hp 22h or 4hp 22eh 4hp 22h or 4hp 22eh 4hp 22eh 4hp 22h or 4hp 22eh 4hp 22h or 4hp 22eh 4hp 22h or 4hp 22eh 4hp 22h or 4hp 22eh
Auto tranny ratios (1/2/3/4 - R) 2.73 / 1.56 / 1.00 - 2.09 - 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09 2.48 / 1.48 / 1.00 / 0.73 - 2.09
Final Drive ( differential ) ratio after 11/83 3.91 ( before 11/83 3.64) 4.1 84-85 2:79; 2:93 2.93 2.93 3.73 3.73 4.1 3.73
. . . . . . . . viscous coupling center differential has 27%/63% f/r torque split .
Length [mm] ? ? 4490 4490 4450 4450 4450 4450 4450
Width [mm] ? ? 1646 1646 1646 1646 1646 1661 1646
Height [mm] ? ? 1379 1379 1379 1379 1379 1400 1370
Wheelbase [mm] 2570 2570 2570 2570 2570 2570 2570 2570 2570
Front overhang [mm] ? ? 845 845 825 825 825 845 845
Rear overhang [mm] ? ? 1074 1074 1054 1054 1054 1074 1074
Front track [mm] ? ? 1407 1407 1407 1407 1407 1420 1407
Rear track [mm] ? ? 1415 1415 1415 1415 1415 1415 1415
Turning Circle [m] ? ? 10.5 10.5 10.5 10.5 10.5 11.1 10.5
http://e30world.com/specifications/BMW-E30-specs-table

Please show me where it says two tanks...

Your link goes to a bunch of guys talking about exactly the same thing as we are - how much fuel is there in reserve when your light comes on. If you look at that one link of mine, you will see that you can buy an extra tank that fits into the spare wheel well.
 
that wall of stats makes no reference to reserve tanks, it can for all intents and purposes refer only to the main tank

also the link I provided specifically has one user referring to the two tanks where he says "50l for under the seat, 20l behind the seat", I like how you don't mention that.

I know for a fact that there is a reserve tank behind the rear seats of an e30 because that is why e30s provide such poor sound for sound systems. When I get to my car I will take pics.
 
On the E30 there are three tanks, all connected. Below there are two that are separated by the prop-shaft and connected to each other with a metal pipe. There is also one behind the backseat. Non of them are "reserve" tanks, they are all connected.

Edit : I know this because I was the idiot that smelled of petrol for a week after removing that pipe connecting the two and getting a mouth full.
 
they not going to believe you, even if the designer of the e30 came here and stated there are more tanks they would discredit him somehow
 
Rouxenator said:
On the E30 there are three tanks, all connected. Below there are two that are separated by the prop-shaft and connected to each other with a metal pipe. There is also one behind the backseat. Non of them are "reserve" tanks, they are all connected.

Edit : I know this because I was the idiot that smelled of petrol for a week after removing that pipe connecting the two and getting a mouth full.
Click to expand...

I will agree with you, since I know that the Ford, Mazda, Toyota and Isuzu bakkies have a similar connection, obviously model dependant, the mentioned Isuzu is a 2008 KB300.
 
LOL @ this argument

If all are connected does that not technically then only count as 1 tank, and does that not make someones interpretation of the original question the problem here?

Comparing OP's question to this argument, I would say the E30 has 1 tank as there is no switch
 
M3mPh1z said:
LOL @ this argument

If all are connected does that not technically then only count as 1 tank, and does that not make someones interpretation of the original question the problem here?

Comparing OP's question to this argument, I would say the E30 has 1 tank as there is no switch
Click to expand...

I am no technical person when it comes to motorcars, but it may be the same tank with compartments (one being metered).
 
I will confirm the tank's name behind the seat and how the fuel guage relates to the tanks but a reserve tank can't be seperate from the main tank, that would imply a seperate fuel pump etc which is impratical and increases the risk of things going wrong.
 
What bugs me is that the fuel indicator takes very quickly to dip once past the middle. I don't know if this is just paranoia...anyone else notice that?
 
My needle has been below the "E" for a couple of days and no reserve light yet.
 
Are we agreed then, that if they are interlinked, it's counted as one tank, even if they are scattered all over the damned floor?

In the Beetle, the reserve was switched over mechanically, giving you an extra couple of litres.

I have still got to find a technical reference to an E30 having a separate reserve that is employed at some point before running out of fuel.

Once again, it is pointless giving links to threads such as this one.
 
no we are not agreed, connected tanks may simply be so that the reserve tank has access to the fuel pump.

the reference you posted refers to the main tank as 50 odd litres which is corroborated by the link I provided, there is an additional 20l that is unaccounted for that sits behind the back seat.
 
Fazda said:
Once again, it is pointless giving links to threads such as this one.
Click to expand...
:D Its just nice when you are wrong, well I enjoy it every now and then that it happens.

That being said per your interlink definition the E30 has one "tank" and there is no switch over. I guess other cars could have the same, especially rear wheel drive ones, but thusfar the only one I have personally worked on is the E30.
 
saturnz said:
no we are not agreed, connected tanks may simply be so that the reserve tank has access to the fuel pump.

the reference you posted refers to the main tank as 50 odd litres which is corroborated by the link I provided, there is an additional 20l that is unaccounted for that sits behind the back seat.
Click to expand...

Where behind the back seat? Do you know how dangerous that would be ? Yes, cars in the 50's had tanks wherever they could stick them - modern cars are not so simple as there are 50 million American drivers who will sue the manufacturer if the cars catch fire. A tank floating around behind the seat is begging to explode in an accident.

If those guys in the thread are talking about fitting an extra tank, then it's something else - not something that is standard from the factory.
 
Fazda said:
Are we agreed then, that if they are interlinked, it's counted as one tank, even if they are scattered all over the damned floor?

In the Beetle, the reserve was switched over mechanically, giving you an extra couple of litres.

I have still got to find a technical reference to an E30 having a separate reserve that is employed at some point before running out of fuel.

Once again, it is pointless giving links to threads such as this one.
Click to expand...

In my conclusion it is one tank with a X amount in compartments, how these compartments interact with each other is up to the engineers to explain, but it is also made known that certain compartments are controllable where overs are openly shared (or switched), probably due to the management system dependent on the car model.

Yes, I agree that it is but one tank (or many compartments acting as one tank), the reserve is a compartment. I cannot say anything, I do not have the necessary experience to make this opinion. I will say this that in marketing terms the reserve may be seen as a separate tank.
 
Rouxenator said:
:D Its just nice when you are wrong, well I enjoy it every now and then that it happens.

That being said per your interlink definition the E30 has one "tank" and there is no switch over.
Click to expand...

As per your post where you said that they were interlinked, I am not wrong, I'm agreeing with you... :p

Ergo....agreeing with you makes me wrong...;)
 
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