Fuel pump alternative

[Jay Kempf]

The Walbro is an inline style that I think would take more mods than the
Bosch. The Bosch is rated to more like 300LPH at 6.5 Bar at 12V. It is a
60mm housing same as stock and bottom inlet, top exit with the exact same
threads and connections. So the only thing that would have to be fiddled
with is the height of the ridge that anchors it in the housing. None of that
worries me. I have a dremel and calipers. I can get the butt end of the
thing anchored at the right height above the tank floor. 
 
The stock pump in the manuals at the front end is delivering something like
150LPH out of the piping at the front so assume 200 is plenty at 12v 6.5 bar
behind the regulator. The regulator should be able to handle that amound of
headroom. I have had experience with double pump setups on older porsches
that lead to low flow when one pump fails. Adequate is way better than
inadequate. 
 



jfk


-------------------------
Jay Kempf
jkempf at madriver.com
802 272 5868 

 

  _____  

From: robert weinberg [mailto:centaurus3200 at yahoo.com] 
Sent: Friday, November 18, 2011 1:18 PM
To: jkempf at madriver.com; 'Matt Suffern'
Cc: 200q20v at audifans.com
Subject: Re: Fuel pump alternative


my friend shayne had a bitch of a time replacing the fuel pump in his1992
URS4. the "replacement" bosch fuel pump requires some sort of adapter kit to
fit in the stock basket. same for the 20V i believe. the rumor was that
walbro makes a pump that fits into the stock basket. i haven't had time to
confirm though.

but yeah, a 255LPH walbro should be sufficient up to INSANE HP in a 20V.
what does the stock pump flow?

Robby


  _____  

From: Jay Kempf <jkempf at madriver.com>
To: 'Matt Suffern' <msuffern at gmail.com>; 'robert weinberg'
<centaurus3200 at yahoo.com> 
Cc: 200q20v at audifans.com 
Sent: Friday, November 18, 2011 9:52 AM
Subject: RE: Fuel pump alternative

Yeah,

>From what I can tell nothing is more or less reliable with pumps. It seems
to be more of a luck thing. The one I will take out went 208k miles and 20
years. So whatever I use next is going to be a problem :) I'll probably pull
this thing out and find out it runs on the bench again!

Basing the solution on cheap, available, pump made in VERY large numbers for
lots of applications is probably a good way to go. The Bosch 0580254040 or
044 is the only pump that is specified to go toe to toe with that Walbro
pump for flow and pressure at like 300LPH and 6.5Bar. The pierburg is
supposed to be quieter but I really don't care about quiet. I care about
availability in the long term and little or no mods or extra parts. So a
60mm bottom inlet pump seems the best overall choice as it will just go
right in. Takes $50 and a few days of shipping to find out so I guess I'll
find out. 




jfk


-------------------------
Jay Kempf
jkempf at madriver.com
802 272 5868 
-----Original Message-----
From: Matt Suffern [mailto:msuffern at gmail.com] 
Sent: Friday, November 18, 2011 12:43 PM
To: robert weinberg
Cc: jkempf at madriver.com; 200q20v at audifans.com
Subject: Re: Fuel pump alternative

I don't know if this will be of any help, but the ~$100 Walbro 255 is a very
popular replacement (with minor alterations) for the $300+ Bosch in-tank
fuel pumps in our BMWs.  The consensus is that it's not any more or less
durable than the Bosch unit, but it sure is a heck of a lot cheaper when you
need a new one.