One problem related to tank mounting has been reported for the 1998 Chevrolet Venture. The most recently reported issues are listed below.
The "service engine soon" light came up one morning. A certified friend mechanic checked it out at home with his engine analyzer/computer & found nothing wrong. He then checked out the gas cap if secure. After awhile, the light went off. I still can't believe it was the gas cap because I'm very careful about loose gas caps. Anyway, after 2 days of driving, the light came out again. Beforehand, he suggested to have the gas cap replaced if this happens again. So I changed it & have been driving around for almost 3 weeks now but the light is still there. Somebody said that it might take a couple of gas tank refills before the gas cap get "cross-threaded" or sealed tight. I already had 2 refills & the light's still there. The van's running well & am experiencing no problems whatsoever. I just want to have that light turned off.