There's some bad and misleading information being tossed around here. The Spica system is not something you "fiddle" with until it runs.
1. The fuel low pressure light should either be on BRIGHT, or OFF. The low pressure sensor is on the front fuel filter and grounds when the fuel pressure is below 7 psi. Normal running fuel pressure is 10-17 psi. A dim light tells me that either the switch is bad, or there is a slight short along the wire somewhere. Take the wire off the tang of the fuel low pressure switch and ground it. Check to ensure the dash light (upper left red light on the center dash) comes on BRIGHT.
2. The Fuel Cutoff Solenoid (FCS) could cause the car to initially start, then die immediately IF the microswitch on the back side of the pump is frozen closed, thus energizing the FCS. This is not very likely to be your problem. The microswitch usually does not fail intermittently. To eliminate it as a possibility, disconnect the wire to the FCS and see if that helps.
3. If you're smelling raw fuel, it's likely the engine is being flooded. This could be due to a sticking Cold Start Solenoid (CSS). That is the "can" on the top rear of the injection pump. Disconnect the feed wire and see if that makes any difference in starting reliability. Proper starting technique is to press down very slightly (1/2" or so) on the accelerator pedal while cranking. DO NOT pump the pedal.
First of all, though, you need knowledge before fiddling with the system willy-nilly. You need to go through the trouble shooting process in a logical manner. It's much faster, easier, and cheaper that way.
Get the fuel supply system sorted out first. Go download the Fuel Supply System Diagnosis Guide here and read it carefully for understanding:
If you would like the factory SPICA manuals and other technical info, PM me an email address (gmail works fine) capable of receiving some large files and I'll send them to you.