Date: Sun, 19 Aug 2012 22:26:02 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Good fuel filter arrangement?
In-Reply-To: <503151CA.6050807@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
Almost all modern fuel injected vehicles have the filter on the pressure
side, (after), of the pump(s). Not only did VW make this change starting
with the 2.1 they also enlarged the fuel tank outlet.
One thing to keep in mind is that as the engine is running fuel is
recirculating throught eh system, picking up heat from the engine and from
the pumping process eventually raising the temperature of the fuel in the
tank. As the temperature increases so does the vapor pressure making vapor
lock that much easier to occur. If the fuel vaporizes at the suction inlet
of the pump all bets are off.
My first motorhome (1992 Ford E350 chassis) had this problem with the pump
even installed in the tank. At one point down in Florida I got stuck with
it. After being towed to a dealer the tow truck driver told me that this is
a common problem and in a few hours it will run again. Ford's fix with a
redesigned pump which also required a new mount, gauge sensor, and some
other stuff. Some $900 later plus a rental car etc. All that on a vehicle
with less than 40,000 miles on it. FWIW my 88 Fox has two pumps, a transfer
pump in the tank and the main pressure pump. Common on many VW products.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rocket J Squirrel
Sent: Sunday, August 19, 2012 4:51 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Good fuel filter arrangement?
I'm poking through the fuel delivery system right now, seeking the cause for
the start/stop syndrome I had to deal with last week. One area I'm looking
at is the fuel filter setup.
On my van ('84, 1.9L) the arrangement is like this:
gas tank > small square plastic filter > fuel pump > large round metal
filter > ring line
As shown on Bentley 20.26
I read on the Bus Depot web site that, "Some 84 and older models still sport
the small capacity square plastic filter. VW determined that the flow was
restrictive and upgraded to the larger capacity metal fuel filter for later
years."
And they sell adapter kits, one consisting of a simple 7mm-to-12mm adapter
that lets a fellow bypass the small square plastic filter, to one that
replaces it with the metal type.
Which seems like it would put one round metal type before the pump, and one
(the existing one) after it?
To heck with all that -- what's the good setup for fuel filtering?
--
Jack "Rocket j Squirrel" Elliott
1984 Westfalia, auto trans,
Bend, Ore.
