Fuel problem survives engine replacement

[84Ed]

I have a 1979 Century 3000 that I must pump the throttle 10 times or more to start. This only happens after the boat has sat for days. Once started, it starts every time with either none, or 1 or two max pumps.

Crazy thing is this happened with my old engine (228 Mercruiser with Rochester 4 barrel), and STILL happens with my replacement engine 5.7 marine engine thunderbolt 2, edelbrock 1409 carb.
it seems pretty obvious that the engine is fuel starved after sitting. I just don't know why.

Ed

 

[flashback]

Most all carb engines require pumping after sitting for a while..10 seems accessive tho.. sometimes it helps to set throttle about half way rather than at idle..

 

[dingbat]

Check to see if someone removed the anti-siphon valve from the fuel tank.

If you have the slightest leak whatsoever in the fuel delivery system the fuel will siphon back into the fuel tank over time

 

[84Ed]

ok, I will check thanks !

 

[Scott06]

My Edlebrock carb dries out when it sits. I think they are known for fuel dribbling down the intake as hot restarts after running a bit I have to advance the throttle a lot to clear out a partial flooding situation.

When it sits there is no gas in the carb. You can pump as many times as you want but until the fuel pump runs long enough to fill the bowl again you will have no fuel. I set my choke run the starter a bit to get the fuel pump running. Stop pump to push gas in, starts right up.

I recall someone on here who has an electric fuel pump putting a momentary switch to power electric fuel pump. Was thinking about doing that but now realizing there is nothing wrong with the state of tune just a dry carb doesnt bother me.

 

[84Ed]

thanks Scott @