What’s this thing?

[AHPP]

Between the fuel and the carb on a Kawasaki v twin on a Viking mower. 
 

 

[GarethM]

Vacuum fuel pump

[Stubby]

It has a breather by the looks of it , what ever it is .

[petercb]

As Gareth said it's the vacuum fuel pump

[AHPP]

How do I test to see if it’s the problem? Good fuel supply getting to it. The mower runs for a minute or so and then dies. Leave it for a couple of

minutes and try again and it runs for another minute. I suspect this fuel pump isn’t replenishing the carb bowl quickly enough. 

[GarethM]

I'd take the bowl off the carb and check the float valve isn't blocked 1st. Is the carb fitted with a solenoid to shut off the fuel supply?.

 

If fuel is getting to it without gravity it's probably working, but if it's got nowhere to go it'll just sit there like a plugged sink.

Edited May 24, 2023 by GarethM

[AHPP]

[GarethM]

Definitely time for a clean and use some jet cleaner wires brush to see if it's got a blocked bowl float valve.

[petercb]

Check the vacuum tube hasn't got a split in it.

[AHPP]

Aye. Filthy. Problem appears to have been fixed by the application of 70 psi to outside and inside of carb. Cheers, folks.