Originally Posted by IcantDo55
Don't all cars cycle the fuel pump for a second or two in the start position?
Ah. I thought you meant the RUN position. I got that from when you said "...when you move the key from OFF to RUN."
The fuel pump should not operate when you move the key from OFF to RUN.
When the key is turned to the START position, the fuel pump runs continuously for so long as the key is held here (presupposing that your foot is also on the clutch pedal, or that you have bypassed the lower clutch switch.) This is one of the two things which the ST SIG fuse does (uses power from the starter to close the fuel pump relay).
When you release the key from START, power from the starter no longer drives the fuel pump relay, under the assumption that either the engine didn't start (and the fuel pump is not needed), or the engine did start and there is now enough airflow through the AFM to close the switch inside it and drive the fuel pump relay that way.
When you pulled the ST SIG fuse, you removed the ability for the starter to power the fuel pump relay. By jumping the F/P terminal, you effectively bypassed this (although by a different set of wires, through a different circuit- it is not 100% equivalent.)
The reason that the engine is hard to start now, (even with F/P grounded) is that the ECU is no longer getting voltage from the starter on pin 1C, which indicates to it that it should be in cranking mode- squirting extra fuel and retarding the timing. The 1.6 ECU is an idiot, and it can't tell you're trying to start the engine unless you explicitly tell it so.
So, something about the ST SIG fuse not being there allowed the engine to start without flooding. It would be interesting to see what was to happen were you to start the engine, get it idling, and then install the ST SIG fuse.
As background, how badly has the electrical system of this car been hacked up?