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

[Chris]

My only advice....don't take 034's advice. They will always advise you to buy something expensive from them and when you have a problem with it they will always tell you you're the first person to ever have a problem. 

> On Feb 16, 2015, at 23:13, AF <afinn1 at gmail.com> wrote:
> 
> 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
> _______________________________________________
> Audifans urq mailing list
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
> http://www.audifans.com/kb/List_information
> 
> Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/
>