That tank insulation was there for very good reason. The pressure in the tank will equal the vapor pressure of the fuel. The heat from the engine-transmission is raising the temperature of the fuel increasing its vapor pressure. Also make sure the venting valve is working. It is vacuum operated. You can usually hear it click as the throttle is opened. The vent valve opens a port into the air filter so that any vapors escaping get burned off in the engine. Dennis
-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Stephen Engel Sent: Tuesday, May 14, 2013 8:16 PM To: vanagon@GERRY.VANAGON.COM Subject: Excessive fuel tank pressure My 87 Syncro GL 2.1 WBX releases way too much pressure, I believe, when the fuel filler cap is opened. It may be my imagination, but the problem seems to get worse the longer I drive and the emptier the tank is. When I first had the van, before any work was done, the fuel sender was leaking badly allowing any air (and fuel!) to escape readily. The engine/ trans and fuel tank were removed and all fuel lines, grommets, rollover vents, seals were replaced along with fuel filler neck, fuel sender, and tank straps prior to reinstalling refurbished engine last year. Only the cap and tank itself are original. The tank insulation was omitted during reinstall. Any suggestions on what could be wrong? Thanks in advance, Steve
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