20 hp 1980s BB merc fuel shortage

[mattoc]

hi my 20hp mercury is running for around 30 seconds and then stops i noticed that when i go to start it again it needs to be primed up again because the fuel floot bowl is completly empty iv had a look at the pump and all seems fine it might be the float but how do i tell were the float is ment to sit and any other ideas on what else it could possibly be??? any comments will be a great help. THANKS

 

[Laddies]

Re: 20 hp 1980s BB merc fuel shortage

More than likely a check valve in the pump is not working properly

 

[Silvertip]

Re: 20 hp 1980s BB merc fuel shortage

If you can squeeze the primer bulb and it gets firm, the float and inlet needle and seat are working as they should. As Laddies pointed out, simply looking at the pump doesn't prove its working or not. Put on a new one or rebuild the existing pump. A pin hole in a diaphram is all it takes to render a fuel pump useless.

 

[mattoc]

Re: 20 hp 1980s BB merc fuel shortage

thanks i will rebuild the carb first im have trouble finding a new or 2nd hand carb