Fuel system shuts down

David Vanden vandendavid18 at yahoo.com
Tue Nov 17 14:22:28 PST 2015

That might be the problem.  I don't know who sells the appropriate sized fittings to get the outlet equal to the inlet.  Anyone know who sells appropriate fittings for the Bosch 044 Fuel Pump?

     On Thursday, November 12, 2015 9:13 AM, Cody <cody at 5000tq.com> wrote:

 Does a 4000 have an external pump? If so you might be having an issue with 
the pump flowing so much fuel to start cavitating at the inlet due to the 
tank outlet to the pump being too small. Ben Swann has been there and fought 
that and should be able to weigh in with some tips.

-Cody Forbes

-----Original Message----- 
From: David Vanden
Sent: Thursday, November 12, 2015 6:28 AM
To: quattro at audifans.com
Subject: Fuel system shuts down

I have got my 4000 Quattro running like a dream and then after running it 
for a while the fuel pump shuts off.  I put a performance pump on it , but 
that pump is universal and should work.  I was advised by a mechanic that 
the check valve in the fuel distributor could be clogged with gunk or that 
there could be gunk in the gas tank that is obstructing the increased 
pressure demands causing the pump to eventually overheat or the circuit to 
overheat and then shut off.  Has anyone had any experience with this.  What 
might be causing the system to get clogged or not be able to fulfill the 
increased pressure demands.  I got the pump from ECS tuning and it is a 
Bosch pump.  They use it on porsche and other such cars.  It is a good pump 
and it is on right.  I changed the main fuel filter that is by the pump that 
attaches with a banjo bolt.  Has anyone experienced this same scenario or 
does anyone have any ideas of what might be causing the problem or what 
modifications would need to be made to the fuel system to allow the pump to 
work continuously?  Please let me know.  I will most likely bring it to a 
mechanic but it would be good to have an idea about what is going on with 
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