Please help:

My car won't start. Fuel pump running ( hear & feel sound), fuel relay (MAS) is working, OVP working. Replaced fuel accumulator. Fuel delivery is verified upto inlet of distributor & outlet of fuel regulator.

Starts & runs under load after I poured few ounces of fuel in fuel intake and crank at least two times. Noticed, the rpm swings before it starts.

Question: Can fuel filter cause this problem? Anything else I should checked?