What do I need to buy or what should I do if my fuel reserve does not work or what is the fuel capacity for a 1991 Yamaha FZR 600?

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Engine Engine type Liquid cooled, 4-stroke, forward inclined parallel 4 cylinder, DOHC 16 valves Displacement 599 cc Bore x stroke 59.0 x 54.8 mm Compression ratio 12.0 : 1 Maximum power 66.8 kW (91 HP) @ 10,500 rpm Maximum torque 65.7 Nm (6.7 kg-m) @ 8,500 rpm Lubrication system Wet sump Fuel System Mikuni BDST32 x4 Clutch type Wet, multiple disc Ignition system Transistor controlled (digital) Starter system Electric Transmission system Constant mesh, 6 speed Primary reduction ratio 1.708 Secundary reduction ratio 3 Final transmission Chain Ratios gearbox 1st 2.846 Ratios gearbox 2nd 1.947 Ratios gearbox 3rd 1.55 Ratios gearbox 4th 1.333 Ratios gearbox 5th 1.192 Ratios gearbox 6th 1.111 Chassis Front suspension system Telescopic fork Front wheel travel 130 mm Rear suspension system Swingarm (Link suspension) Rear wheel travel 115 mm Caster angle 25° Trail 94 mm Front brake Dual discs, ø 298 mm Rear brake Single disc, ø 245 mm Front tyre 110/70V17 V240 Rear tyre 140/60V18 V240 Dimensions Overall length 2,165 mm Overall width 700 mm Overall height 1,155 mm Seat height 785 mm Wheelbase 1,425 mm Minimum ground clearance 135 mm Dry weight 181 kg Fuel tank capacity (reserve) 18 L Engine oil tank capacity 3.1 L