29-06-2022, 09:14 AM
it it a T type or a U type?
Sounds to me that you have a leak in one of the non return valves alowing fuel to drop back to the tank and then not sucking it up again.
Ive found the U type non returns to be intolerant of dirty fuel and pretty unreliable. The t type are much better in this respect.
The standard test is to suck and blow in the relevant connections. you should be able to suck via the connection to the carb, but not blow. You should be able to blow into the connection for the tank feed, but not suck.
In a U type the valves are pretty much tamper proof and need to be replaced. On a t type they are just mica disks on a brass seat with a spring. Some mild abrasive usually restores them to working order.
Sounds to me that you have a leak in one of the non return valves alowing fuel to drop back to the tank and then not sucking it up again.
Ive found the U type non returns to be intolerant of dirty fuel and pretty unreliable. The t type are much better in this respect.
The standard test is to suck and blow in the relevant connections. you should be able to suck via the connection to the carb, but not blow. You should be able to blow into the connection for the tank feed, but not suck.
In a U type the valves are pretty much tamper proof and need to be replaced. On a t type they are just mica disks on a brass seat with a spring. Some mild abrasive usually restores them to working order.