Fuel Hoses Lines/piping And Fittings problems of the 1999 Chevrolet C2500

Vehicle had been running poorly for about 2 weeks maybe more. Fuel pump also was sounding funny. Instead of the normal quick whirring for a few seconds the pump sounded like it was laboring and had a slower, deeper pitch. I thought maybe it was time for tune up but my records showed otherwise. ( I keep pretty extensive vehicle notes on all work/maintenance performed. ) on the morning the actual problem finally was discovered I had started my truck after a little more cranking effort than usual. Engine ran for about 20 seconds or so and than shut down. Tried to restart but the fuel pump didn't power up and then the smell of fresh gasoline was everywhere. After getting out of the truck I took a look on the ground and yes there was gas on the ground and still dripping from up under the truck. Took out my flashlight and carefully peeked underneath and right away saw the main fuel leak. Fuel lines on both the supply and return sides are rusted pretty badly in multiple areas. Gas was leaking at least 4 points from what I could see at that moment. Seems that the plastic hold downs for these fuel lines and the brake lines are the culprit with these issues. This pump burned out do these leaks so now I have to replace the fuel pump module again, as well as the complete fuel line system front to back. I removed the 34 gallon fuel tank and the tank also needs to be replaced as it is severely rusted. I mention all of this because I have replaced the fuel pump twice before due to failure and now it seems that the ethanol blends are ruining these pump modules also. Each time I had removed the fuel tank I inspected the exterior/interior and cleaned, prepped, and applied rust deterrent products as needed. I have owned vehicles from the 1950's and 60's and never had these any of these type of issues.

We have a 1999 chevy 2500 with approximately 52,000 miles on it. We've noticed all along that the gas gauge has not functioned correctly. Yesterday, I approached the vehicle and smelled gas. I looked under the pickup and saw gas dripping from the fuel tank area. I took the pickup to my local dealer (young motor) here in lyons. The service manager told me that the emission control unit that vents the gas tank was plugged thus causing the fuel pump to suck in the fuel tank. As the tank collapsed, it pushed the sending unit/fuel pump upwards. I just checked our 2000 chevy pickup and the same thing is happening to it. Reading through the owners manual, there is nothing stating that this vent needs to be cleaned. We also have a 1998 chevy 2500 that had the same problem and we had to replace the gas tank on it. Within our company, there have been reports of other chevy pickups having the same problem. We have 3 at this location: a 1998 sn:1gcgk24r8wz224103, the 1999 sn:1gcgk24r4xr701935, and a 2000 sn:1gcgc24r5yr204892. I find it more than a coincidence that all 3 of these vehicles are having the same problem and there is nothing in the owner's manual addressing the issue.