[urq] I Eat Fuel Pumps - What is Going On

[AF]

I really need the collective wisdom of what's left of the list... a little
background first.

when I rebuilt the UrQ I stupidly did not cut open the tank. I mean the car
had sat outside for 15 years. I should have known better. I wen through 3
fuel pumps, then I switched to the 034 Motorsport 1 litre sump can and 040
motorsport in-tank pump with a low pressure feeder pump. I went through 2
of those 040 series Bosch pumps before I realized the tank was FULL of crap
and killing pumps. I did everything wrong, I used a 10 micron pre-pump
filter which was too fine, I tried the original filter-like plastic
pre-pump thing, but last week I finally decided I knew the solution and
stripped all the plumbing out and went back to an aeromotive 100 micro
pre-pump filter, a bosch 044 racing pump and at Patrick's suggestion I put
a pressure damper on the outlet of the pump. I cleaned and POR15'd the
tank. I cut the filter sock completely off the intake in the tank. I
thought this was the last time I had to mess with the system.

This weekend at the track, 70 degree day, the pump is buzzing like a hive
of bees and then either overheats or vapor locks after the last run of the
day. I had to wait for something to cool down before it would run. It would
start, run, then stumble and die. Lots of pressure in the tank when I
opened the filler cap.

Can anyone possibly tell me why this pump seems to be dying now after 6
hours of use? What is happening that is killing it? I do have an adjustable
fuel pressure regulator and 034 tuned it to produce more fuel as I was
running a little lean. Is this an issue of the pump flowing too much fuel?
It's a tuned ABZ V8 but these pumps should be good for 700 hp right? I am
truly at a loss.... Any help is appreciated.

Andrew Finney
1985 UrQ V8