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

[AF]

I just found this on a bosch website. Maybe I need to measure my fuel
pressure. Maybe I don't need an 044 Racing Pump?

*Fuel pump → fuel pressure regulator compatibility*

Whilst it has become common practice to fit high flow competition type fuel
pumps to standard road cars, it is important to consider whether other
system components are suited to this modification. The function of the fuel
pressure regulator is to maintain system operating pressure at a preset
factory value. This regulator can only do this within its’ nominated return
flow specification, an abnormally high fuel flow may exceed the regulators
ability to control fuel pressure as it cannot recirculate the fuel back to
the fuel tank quickly enough. This situation will result in an abnormally
high fuel pressure and/or erratic control.

Andrew Finney

1985 UrQ

On Mon, Feb 16, 2015 at 8:09 PM, AF <afinn1 at gmail.com> wrote:

> 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
>