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I've found on mine depending on how long it has been since the engine was run and the outside air temp 5 pushes on the primer works better at times. If it does not fire after a 2-3 pulls then give it another 1-2 pushes.

Any gasket leaks will lean out the air fuel mixture which is the opposite what you want for especially a cold engine. Replacing that being torn should make a difference.
 

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...Should this model have a Gasket between the Carb & Engine ? There isn't one fitted, it has a sealing O ring but I can across this Carburetor Gasket 272199S Order now for same day shipping. 365 day return policy. RepairClinic.com
Should one of those be fitted between the Carb & Engine ?
Thanks For Any Advice :cool
I made my first post on my iPod and did not pull up the diagram. Looking at the pictures on this site it looks like your engine originally only came with the O-ring for the carb to engine connection. So if the O-ring still looks fine I don't think anything would be gained by adding the flat gasket as well. But you do need to replace the air filter to carb gasket if it is damaged as that would let dirt bypass the filter and also could make the engine run a little leaner as it might slightly increase the amount of air coming into the carb.

Parts and Diagrams for Briggs and Stratton 12F802-1783-B1
 

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....The Primer Bulb looks fine, it has a manufactured hole in the centre of the bulb, which I could never work out why ?
Would i be better with a new Primer Bulb, one without this manufactured hole in ?....
I think the internal passage design of the carb dictates whether the primer needs the hole in the center. I've always suspected that the ones with the hole prime when pushing (and your finger covers the hole) and the ones without the hole prime on the return stroke as the bulb expands back out.
 
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