Date:         Wed, 18 Oct 2006 15:05:40 -0400
Reply-To:     Greg Potts <greg@POTTSFAMILY.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Greg Potts <greg@POTTSFAMILY.CA>
Subject:      Re: Fuel pump pressure
Comments: To: Ed Duntz <eduntz@HOTMAIL.COM>
In-Reply-To:  <BAY122-DAV3F6BE71EC971B075E87FEDB0E0@phx.gbl>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi Ed,

I looked this stuff up back in 2002 in Bath NY, when Dad's vanagon
westy had a fuel pump failure on the way to EveryBus. Fred Roberts
Auto parts had a VERY thick book of parts specs and was kind enough
to cross reference these details in order to find us the part we
needed to get back on the way. And when he didn't have the part in
stock he directed us to  the local NAPA who did.

I don't remember the exact numbers, but the gallons per hour and max
pressure ratings are VERY similar. I recall that the vanagon pump had
a slightly different high-pressure shut-off point, but since that in
both cases  it was about 3x the operating pressure of the fuel
pressure regulator it isn't a significant detail.

The Vanagon fuel rail regulates its pressure with a regulator that
constantly dumps excess fuel back to the tank. Upstream of the
regulator you get the desired pressure according to the signal that
the regulator receives. As long as the gallons per hour and pressure
specs of the pumps are similar, the end result at the fuel rail and
injector will be the same. I would be more concerned about an over-
rated GPH rate than the max pressure rating, as the fuel rail will
never get to max pressure unless the regulator fails or the return
line is blocked.

That vanagon is still using that same fuel pump about 70,000 miles
later.

http://www.pottsfamily.ca/VW_type2/EB2002/AGF00016.JPG


Happy Trails,

Greg Potts
1973/74/75/77/79 Westfakia "Bob the Tomato"
www.pottsfamily.ca/westfakia
www.busesofthecorn.com








On 17-Oct-06, at 4:12 PM, Ed Duntz wrote:

> Does anyone know what the output pressure on the stock Bosch and/or
> standard replacements for the fuel pump is?
>
> I'd like to compare the pressure to the Ford F150/Bronco cheaper
> replacements that some have used.
>
> How much of a difference from designed pressure is safe? Can you
> use a pump with more design pressure?
>
> Thanks,
> Ed in CT