Put two wheels on kerb, lie down by drv side rear wheel and tap tank/does
it sound like there's any in there?If not sure disconnect banjo on metering head and turn it over, is there anything fuel coming through?
I there isn't or it takes a long time to come through as Safe Chav says
check/change the non return valve on pump. I had something similar recently and changed almost everything inc met head, regulator,injectors
etc etc/but neglected to change the cold start valve. In last act of desperation and cos I changed every thing else I changed the cold injector/now runs perfectly, hot or cold.