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I think you may be right…

Yeah, thanks. Emptied and cleaned the pump. All ok pressurised the system again and still won’t start. No fuel in 1,2,3 fuel bowls.

The fuel relay tests ok and 12v is getting to the pump but now no noise from the pump! I pulled off the fuel filter and replaced it with a clear one and no fuel is being lifted. The pump is coming off.

Ok, (just for info I have spark) no fuel coming out of carbs with drain screw loosened other than the cylinder that’s firing? Fuel filter is old (new one on its way). Could it be the fuel pump or pump relay?

Thanks, I’ll give it a go as soon as I can and report back.

Yeah will eventually run (just) on 1 cylinder only, not running on all four at all, rear right hand side (number 3). Will only start with no choke now, tickled with a little throttle. It did start normally last week. Unfortunately I am in a bit of a rush as we are moving so I didn’t drain out...

Gen 1, COPs fitted (from Morley’s). Bike has been garaged for 2 years. New battery was fitted and the bike started without any problems. 1 week later (battery still good) struggling to start, eventually starts (just) but is running on 1 cylinder. Any ideas? Bad fuel? Blockage, filter needed...