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

[Scott Justusson]

 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 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 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*
>
>