Thanks for the info. My Z is a 92. My gas guage does not seem to be irratic. However, whenever I fill up my tank it only goes up to 12- 12.5 gal. I fill it up when it is little above the empty mark. Is the small hose you decribe on the plenum a common leak area? I know the car has an 18 gal. tank but how much goes into the reserve? We have Alldata at school so I will look up those TSBs. I should have done that first. Thanks again.