GSA fuel tank question

[Wobs]

I got an early 1150 GS to replace my 1100 back in early 2000. Then the GSA came out and would've lead to a divorce if I got one so I satisfied myself with a GSA tank. I thought of the Touratech 41L one but was put off by cost, ugliness and stories of exactly how much you could squeeze into it.

Anyways, I got a GSA tank and swapped the guts of my standard tank into it and bunged on all the QD pipes between the lobes of the tank and to the injectors. Never drilled the neck as most of my mileage done in the hot and I worried about pools of unleaded sunbathing under the bike.

I've picked up on a thread recently that swapping internals of the GS tank into the GSA tank means fuel guage and botty clenching orange fuel light will come on early.

Does anyone know if thats right? It'd explain a lot to me if it does cos I've never thought I got enough outta that huge lump of steel holding up my tank bag. I've even taken to carrying around a spare coupla litres when I think there might not be too many chances to fill up.

Also 'cos I've lost an awful lotta brain cells over the intervening years I can't remember how many euro quarts the GSA holds (both according to BMW and in the real world) although I'd bet that those tricky Germans calculate capacity using the overflow bit that drilling the neck allows you to fill with BP's finest.

Any info would be gratefully received.
Thanks

 

[Possu]

GS tank holds 22 litres, Adventure tank holds 30 litres unless you've drilled the filler neck.

If you've not bent the standard GS float arm, the low fuel light will come on early, approx 10 litres remaining.

 

[davegs]

Adventure tanks

Yes it does come on early I always re set the trip on the speedo wheb filling up bending the arm is a haphazzard way of doing things as you dont' know where you are just use the trip I've done 30.000 on miine with the ad. tnak on and never runout, most was 316 miles still going but for how much further I don't know. Apart form that no probs at all (apart from picking the thing up!!).
dave gs.

 

[Wobs]

Thanks for replies. 30 litres, thats about 6.6 gallons so at 300 to a tank is about 45 mpg.
I agree bending arm a bit hit and miss. Now I'm gonna try filling up as soon as light comes on and see exactly how much petrol I've been carrying around for years and not using.