Based on personal experience and research, I suspect there is a nationwide problem with the quality of Costco gasoline. In other words, Costco sells "bad gas." Moreover, Costco is aware of this problem but has failed to remedy it. As a result, a number of consumers have sustained damage to their vehicles as a result of Costco's "bad gas." On January 28, 2015, I filled my 1989 Ford Econoline van with Costco regular gas in Simi Valley, California. My van has fuel injection and starts immediately. However, on this occasion, it took several minutes with about 10 attempts to start my vehicle. A passerby said it was probably the Costco gas. Later that day, I started my van again, but the startup was delayed. I suspected Costco gas as the culprit. I put in $20 worth of Shell gas and my van started much better. The following day, my van started but there was minor backfiring in the exhaust. I then went back to Shell to add additional "good gas" so as to completely fill up my gasoline tanks. (My van has 2 tanks.) However, I could not start my van afterwards. An automotive garage nearby came to my rescue. They were able to start my van by spraying brake fluid into the intake manifold. Based upon extensive diagnostic testing, the mechanic has concluded that contaminated fuel from Costco caused my vehicle's mechanical damage. I am looking at $1,000 in repairs. (I informed Costco about this problem and was advised to submit an incident report which I shall prepare.) An Internet search has revealed a number of consumers who have been damaged from Costco's "bad gas." (I also recall last year that a late-model vehicle at the Fremont, California Costco was unable to start after filling up with Costco gas. Could it have been from Costco's "bad gas"? Shortly later, the underground gasoline tanks were replaced with new tanks!) Consequently, I believe this problem is ripe for a class action lawsuit against Costco and I would be willing to be the lead plaintiff. Thank you.