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conclusion - ordered and fitted a Walbro primer bulb and all is fine. Looks totally identical to the bad one.

well I've tested the bulb with petrol and tubes and a jam jar and it certainly pumps in the right direction but also spits fuel out of the inlet - which causes the flooding carb

you're right about its function. It doesn't fill the carb with fuel (mine does coz it sort of backfires) It's misleading that Stihl on its parts diagrams calls it a 'Fuel Pump'.

the market is flooded (ha ha) with clones - they have a red circle visible in the bulb got the saw started by using the primer ONCE - any more and the carb is full of petrol!

I think the new bulb is faulty - whilst it pushes fuel mainly in the right direction, for part of the pump 'cycle' is's pushing fuel back down the wrong way. Serves me right for buying a non-Stihl one...

Only asked on one thread - this one. Sorry, I thought it was relevant as the thread is about installing a deck belt and I was asking about how to install a deck belt...

I'm sure the bulb is connected correctly - it pumps fuel down into the tank and draws it up through the carb. I also note that, with the purge bulb connected up, pressure builds up in the fuel tank and fuel squirt out as soon as the fuel line is taken off the carb.

Can anyone point me in the direction of correct procedure for deck belt install on CT154?

Hi gents - I arrive here bearing a problem - not gifts, sorry Never done much to my MS230C saw before - but I had to replace the purge bulb and then the main fuel line. The saw ran between the two jobs but after doing the fuel line (which needed carb removal) when I pump the purge bulb, fuel...