BMC A series thermostat etc

[tabbypurr]

It's a complex/expensive way to let you know the tank is near empty. I guess it dates from the days before dashboard fuel gauges were widespread.

NT

[Dave Plowman (News)]

Yes. And still quite common on motorbikes long after most car makers had abandoned it.

[Max Demian]

I thought the usual way with motorbikes was to have separate pipes to either lobe of the tank (which straddled the crossbar), with a three position lever designated 'off', 'main' and 'reserve'. (Though the distinction between 'main' and 'reserve' was arbitrary as the tank is symmetrical; the reason that the main tank contains more fuel is that it effectively includes the common area above the crossbar.)

[Marland]

Was the Triumph one that sophisticated? I thought it was just a higher section in the tank that when you operated the lever it just drained that into the main tank, normally when filling this compartment was already full and just overflowed into the main section..

GH

[Marland]

harry <

There?s at least one in or near the West Midlands that has a dipstick in it.

GH

[The Natural Philosopher]

And a weird nut behind the steering wheel.