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. |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.