Thanks for the additional responses. I don't argue that it still might be the carburetor but when you put a brand new one on it and it does the same thing I'm not sure that it's the carburetor. However I was taking apart fuel pump and I was looking at a diagram and there are parts missing. Two tiny Springs that are not there. So I'm curious whether that's enough to keep the fuel pump from working properly? Anyhow, I ordered the kit.
Never assume anything is in good working order strait out of the box, particularly after market parts.
I don't know about the other techs here, but I keep around a 1/2 dozen different good carbs on hand for the purpose of diagnosis .
When you read a lot of service manuals they often use the phrase "replace with a known good part" . The important bit is KNOWN GOOD .
Now I try to only use branded after market parts from reliable wholesalers that warrant the parts they sell .
But this does not mean that every part I get from them is good , just that it has been through some sort of QC at the factory so should be good & if not it will be replaced .
Lots of what is on line are the parts that failed the QC at the factory which may or may not have been repaired before being sold for less than the scrap metal price then on sold to you.
I have had a customer who bought 3 carbs from 3 different vendors on ebay & got a carb with the same fault every time, which was a venturi tube with no holes in it at all.
There was another batch of Nikki copies that were all missing the welch plug which goes in the hole that the idle volume screw used to be prior to having adjustable idle mixtures banned.
That was excellent for me as I buy rebuild kits that come with 2 plugs and rarely need to pull the old one so end up with a lot to spare .
Probably saw at least 10 of these over a couple of years .
If you hang around here a bit you will see most of us advising owners to fix their old carb, even when the rebuild kit costs more than a complete new knock off.
The sole exception are cube carbs where they often do suffer from unrepairable problems but for all mower carbs it is very rare to find a body that is beyond repair unless it is 50 years old and the holes for the butterfly shafts are flogged out really oval & leaking badly .