Right, thanks for the advice given in answer to my last question. Finally\ngot some time to do the testing today. The result: while cranking the\nengine on the starter, battery 10.6V, supply to fuel pump 2.5V.\n\nDoing this is a multi-handed balancing act, so I poured some petrol into the\ncarbs manually (funnel & glass jar actually) and started the engine, the\nidea being to check volts to the relay and pump without having to hold the\nstarter button. As soon as the engine fired the fuel pump started working.\nA surprise to me was that its rate of pumping varied with engine revs up to\nabout 4000 rpm.\n\nSo I ran the engine until all the petrol in the carbs was gone. Cranked\nengine as before, but now the fuel pump runs. Bugger, an intermittent\nfault.\n\nThis fits, as the reason for this whole exercise was that the bike stopped a\ncouple of times while I was riding it, then ran ok. Left it in the garage\nfor a couple of weeks, then it wouldn't start.\n\nSo, apart from ride it 'til it stops again, or sell it (it's bound to die\nduring a test ride), any clues on what to do next? My first guess is a\nsecond-hand fuel pump, but budget is limited, so I can't just go buying bits\nuntil it works.