200TQ hard starting (still) - some updates. HELP (please)!

[Bart Oleksy]

My mechanic's been working on and off on the problem I've been having 
with my '91 200TQ for many months now.

Quick recap:  The longer the car sits after running, the longer it takes 
to start again (up to a max. of about 5-6 seconds of cranking).  Starts 
like a shot within a few minutes, then gets worse.  Also rough idling 
afterward, smelly exhaust (I'd say a gas smell).

Update:  New fuel pump installed.  Fuel accumulator swapped out, changed 
a corroded fuse box as well, since there seemed to be some electrical 
issues involved.  Pressure seems to be holding in the system.  My 
mechanic has a 200 as well without this problem, and has swapped in his 
computer and his master fuel pump relay with no change.

The main thing seems to be that the fuel pump doesn't kick in (engage) 
for 4-6 seconds after I try starting the car.  Any other suggestions on 
what to check, that could be contributing to the problem?  He's getting 
stumped, but because pressure seems to be holding in the system (after 
swapping out the accumulator) he doesn't think it's the injectors. 
Help!  (Thanks in advance.)

Bart
1991 200TQ
1986 CGT