Technical Punto 60 s not starting - intermittent

[davet30]

Ok,

Some times it starts fine, sometimes not?

Facts obtained during the ‘not starting’ state are:

1) Plenty of fuel getting to carburettor (evident when return line was disconnected).

2) When turning engine over getting spark at the spark plug.

This would suggest that the ignition circuit was fine and that the fuel pump was working fine.

It’s single injection and I suspect either one of the devices on the carburettor maybe faulty or maybe one of the peripheral transducers is faulty??

Any ideas anyone? Like how could I check the injector etc?

Thanks for listening.

 

[davet30]

Update.........

Removed injector following a none starting session, operated the injector pin manually and re-fitted. - Started first time??!!

Question is. If this keeps not starting is there something I can do to the injector to stop it 'sticking'? or is it a new one required?