Nope- You've answered your own question.

How anyone is supposed to tell that the old second hand fuel pump you have on your car is about to fail (should this be the case) is beyond me.

Sounds like you paid for your setup, they did the best they could for the money and budget etc etc and away you went with the car for somet else to fail.

IF

You'd taken your car to them for a new engine, new wiring, new pump etc etc then yeh their fault- or at least a manufacturer of the part that failed and I would expect them to help you out in someway.

They cant be expected to say yep all fine and nothing will go wrong with the car.

I would say its more coincedence than anything else.

When you're talking about modified cars anything above standard is a risk= yeh its well know that 170bhp rsts and 300 bhp cossies tend to go on for a while BUT they're still old cars with old wiring and old parts on them and as such NOTHING can be 100% unless it replaces with 100% new parts and then if you modify it past what it was designed for then theres still no guarentee.
We're lucky in that our cars come from a time when things were over engineered and then de tuned for road use.

How much did you pay for your set up out of interest.

best of luck

J