fiat tipo carb

can anyone help. the carb is not getting a signal to let fuel in when cranking.If i put a false electrical feed to the plug at rear of carb it pulses and allows fuel in.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.