Loosing prime after 4 days gas

Had the same issue on my port 470 engine so I rebuilt the 2bbl carb. and it works good now. There is a small ball at the bottom of accellerator pump bowl the holds the fuel in the chamber and the last person in the carb had left it out so I replaced it.After reinstalling the carb the engine then started right up.
I started up both engines the other day and they both required pumping the throttle three or for times and cranking for about thirty or forty seconds , had not started them for about three weeks or so. Choke on port side is sticking closed a bit so ran rich until I adjusted it and the engine warmed up. The starboard engine has always started and ran fine. If I remember correctly you have to put the throttle all the way forward to set the choke.
 
It was interesting that everyone thought that was the issue I had but it was not. Had two different top shelf mechanics look and attempt to diagnose the problem but nothing was found not working as expected.

MM
That's the beauty of carbs. They all have their own idiosyncrasies. On my old 250 Express it always started great when cold. Took forever when warm.
 
That's the beauty of carbs. They all have their own idiosyncrasies. On my old 250 Express it always started great when cold. Took forever when warm.

That is what I have learned also, there is no one size fits all on how they start.

MM
 
My bowels are gurgling just reading this!! My carbs had serious leak-down issues after sitting for the week as well. I watched several YouTube videos on the problem and there are detailed instructions on how to seal the Quadrajet plugs. Check it out.
 
Here in Las Vegas it is hot enough in the summer for the fuel to evaporate from the carb if let setting for a couple weeks. The fuel in the tanks go bad after only a month if you don't have some kind of treatment.
 

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