ES45 surging and non-starting

[DRWDRW]

This seems like it should be a simple problem but...

I have a Briggs ES45, which has had very little use (it's only for the lawn edges alongside a riding mower). It was fine last year but this season is very unhappy.

First start, it was surging and tricky to start. I removed the carburettor, replaced the gasket and made it worse. It would then only start with fuel directly in the carb - and still surging.

I've since then replaced the whole carb but it's no different. I ran through a whole tank of fuel - surging all the way - and changed the filer, oil and plug. How much deeper into the engine do I need to delve?

Thank you .

 

[Scrubcadet10]

Surging is caused by a engine that is running lean, meaning the air fuel mixture has more air than fuel.
I'm going out an a limb and thinking it has a plastic intake pipe with a split in it, allowing more air in PAST the carb.
What's the engines Model number? Should be stamped above the muffler or spark plug

 

[DRWDRW]

That sounds very likely - I'll look out for some plastic after the carb.

The model number is 127707-1723-B1.

Thanks.

 

[DRWDRW]

I've downloaded the parts manual, and it appears there's a plastic intake manifold...

Thanks for the pointer.

 

[Scrubcadet10]

also, there is a O-RING that seals the carburetor to the intake pipe, Number 617 in the list. check to be sure it is in place and not cracked and dry rotted. I've repaired a few that were running wacky due to a small split in the plastic, finally had one one time it spit enough and wouldnt start so the fuel leaked out of it onto the block.

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[DRWDRW]

Thanks, I did change that O-ring when I swapped the carb.

Time to investigate the manifold...

 

[DRWDRW]

Well, the manifold was fine. But it will now run only with fuel squirted directly into the carb.

The primer bulb feels weak. Could it possibly be causing the problem?