RE: [alfa] Spider Fuel Tank Vapor Pressure Buildup

["John S." <roadtrip999@xxxxxxxxxxx>]

What you have is a plugged up fuel tank vent system. As you go up in 
altitude on that hill climb, the pressure decreases . . . . A LOT,  if you 
go high enough. That left pressure that was at the bottom of the hill climb 
in the tank. It probably greatly increased the fuel pressure in the fuel 
line (although the pressure relief in the fuel supply pump should have 
opened) and SPICA pump.

You should immediately clear that vent system. The offending part is 
probably the long metal tube that goes into the plastic vapor tank in the 
trunk. Moisture eventually rusts it shut. The other problem that can cause 
is a vacuum in the tank (and resulting low fuel pressure) due to the fuel 
level being burned down.

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