In job # 7.3-1603 'Testing fuel pressures and internal leaktightness'
On a 103 engine, and assuming that this applies to your 1.6 which I'm almost certain it does.
The article reads:
"5. Check control plunger in fuel distributor for leaks. Briefly press air flow sensor plate (84) down fully and hold tight in this position; a a slight leak quantity is permissible
when this is done."
SO, if this is what you're doing, then the small fuel you see coming out is OK!
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi