Hard Start on 1988 2.3L 190E

[gards]

I am having a hard start on my car after is has warmed up and then sits for just a few minutes.

I was told that the fuel distributor was probably the cause so I changed it. It did not solve the problem entirely, but car feels a bit quicker from a standing start. However, I still have a hard start.

Does anybody know if there is a pre-fuel pump inside the gas tank? I read that it could cause a hard start, but that was on a Volvo. Also, can your OVR be failing and still not cause your ABS light to go on?

It has been sugjested that I check the o-rings on the fuel injection units. Is that a possibility for a hard start?

Thank you in advance for any thoughts or advice.

Gards