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jtf914's Avatar
 
Join Date: Jan 2001
Location: Burlington, CT, USA
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Question Fuel Problem or Coincidence?

I've noticed lately that directly after filling my tank I experience some exhaust popping between 1000-2000 RPM's. It seems to go away when I get down to about 3/4 a tank. Could this be a fuel pump problem, or is a just a coincidence? I have cleaned, rebuilt, and adjusted the webers, but it still happens? Any insight would be great.

Justin


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1970 914-6
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Old 11-01-2001, 08:39 AM
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Sounds coincidental, but maybe the fuel pressure regulator is iffy and the extra head-pressure from a full tank causes a rich condition that results in raw fuel in the exhaust.
Old 11-01-2001, 08:42 AM
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The change in head pressure between a full tank and 3/4 tank should be about .2 psi. I can't really imagine this doing it...allthough I goess stranger things have happened.

Sounds like a coincidence. Could it be when the car is cold?

Sean
Old 11-01-2001, 09:04 AM
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There was a tech article in Porsche Panarama a while back (this year)from someone that had engine missing problems when the tank was full. I can't remember when it was but the cause was a problem with the vents I think. Good luck.
Old 11-01-2001, 09:19 AM
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