5ktq still doesn't start

[Zsolt]

My car still doesn't start. It's been sitting on the street for over a week 
now. :(

There is spark, but we can't hear the fuel pump running, so I'm pretty sure 
that's what's wrong. We changed the fuse and the relay but it made no 
difference. The weird thing is that the day after it first didn't start, I 
tried it, and it started up as nothing ever was wrong, but not since then. 
I am thinking it's an electrical connection issue somewhere.

Any ideas? The car is an 88 5ktq with Scott Mocry's chipped ECU.
Thanks,
ZSolt