[s-cars] 044 vs 040 fuel pumps - mythbustin

[CLAG500 at aol.com]

Thanks for the data Scott. I remember finding similar info when I  
discovered what pump was in my 200 20v. I was looking to upgrade my pump to an  044 
until I discovered that upgrading from an 040 to an 044 would be kind  of 
pointless. Lots of CIS injected Audis have the 040 pump standard.  

btw I sold the Omni and got another eighties turbo four cyl to play with.  
http://imageshack.us/a/img825/4223/n2pb.jpg 
 
Chad "driving a german car again" T
 
 
In a message dated 10/21/2013 10:07:35 A.M. Eastern Daylight Time,  
qshipq at aol.com writes:

The 040 fuel pump is rated at 80GPH (min) with operating pressures up to  
94PSI
The 044 Fuel Pump is rated at 80GPH (min) with operating pressures of  up 
to 72psi

The 040 uses an M10 outlet
The 044 uses a M12  outlet

My own thinking is those running with 4bar fuel pressure  regulators and 
3bar PT ECU programming, would find the *040* fuel pump output  stability 
better matched to the fuel rail pressures required.  For all  other 'intents and 
purposes' the pumps are considered  equal.

HTH

Scott J
95.5 S6



-----Original  Message-----
From: John Cunningham <jc at j2c3.com>
To: CLAG500  <CLAG500 at aol.com>; s-car-list <s-car-list at audifans.com>
Sent:  Mon, Oct 21, 2013 8:23 am
Subject: Re: [s-cars] 200Q20V - hard start  issues


thats what I thought.  at least I guess it makes for easy drop in of the  
044 though since the diameter is the same. (044 is useable in-tank or 
 external BTW... tons of S cars running around w/ them in-tank... I think 
 040 is just a different model, like the 050 or the 900's...)
 
 On 10/21/2013 8:09, _CLAG500 at aol.com_ (mailto:CLAG500 at aol.com)  wrote:
 > Actually not exactly true. Mine was the 040 which is an in tank 
 > version of the same "motorsports" 044 which is an external pump.  
 > Noticed it when I was relaying the pump to the battery. Part number 
 > 0580254040. Fairly common on a lot of older audis. Not s-cars though.
 > Chad T
 > In a message dated 10/20/2013 9:06:18 A.M. Eastern Daylight Time, 
 > _j2c3bospvg at gmail.com_ (mailto:j2c3bospvg at gmail.com)  writes:
 >
 >     is that true? or is it just a lesser large diameter Bosch pump?  I
 >     thought it was more like one of those 900 something OEM pumps.
 >
 >>     200 20v comes with a Bosch 044 pump from the factory.
 >
 >     ----------------------------------
 >     *JC*
 >
 >