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Old 10 September 2015, 06:14   #11
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I'm not familiar with larger engines like yours but I'd be following the route of fuel from tank to carb first. You could pop a hose off under the hood where the fuel goes to filter (I assume) and see if the primer is actually freely pumping fuel up for a start. Then check it's actually getting to the carbs.

I wonder what sort of fuel pump it has and if this might have a problem. Is there any sort of elec fuel solenoid in the system that's not opening?
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Old 10 September 2015, 14:54   #12
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If the bulb pumped hard then you should have got some fuel into the carbs. If you unscrew the screw in the carb float bowls see if fuel comes out. If it does and the engine did fire ,( can't see the vid on an iPhone) then it's not pulling fuel through the system. That could mean no venting, bad fuel pump, hole in a pipe. Either way if the plugs aren't wet that's the problem
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Old 10 September 2015, 14:57   #13
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Okay, well I've just finished rebuilding the fuel pump, new seals etc so that should be fine now, waiting for the proper battery to arrive now to try it
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Old 10 September 2015, 15:04   #14
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Fisrtly don't waste any more time turning it over, clearly something is not right.

Pull the plugs and see if you get a spark from each when turning over. If you have a spark then fuel supply is likely to be the problem.

disconnect the fuel tank and try a fresh can of fuel, after draining all the old fuel. Then its time to look at the carbs.
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Old 10 September 2015, 15:20   #15
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If you do get sparks drop some fuel into the air intake/intakes of the carb/carbs and see if she will run for a few seconds then cut out.
If it does then you have a carb problem ....
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Old 20 September 2015, 08:08   #16
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If the plugs are "dry" after continually turning it over (don't fry the starter), depending on which engine, it could be a goods fuel-pump in-let or out-let valve.
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