Why is my fuel tank collapsing on my GMC Sierra?
Why is my fuel tank collapsing on my GMC Sierra?
I’m also having this problem with my 2000 GMC Sierra SL c2500 5.7. It creates a vacuum and collapses the fuel tank. Im on my third fuel tank but didn’t realize at first a vacuum was crushing it. Any ideas? It seems the more I read, the more possibilities that could cause it but its getting expensive with the tanks and pumps.
Is there a fuel leak at the top of the tank?
I dropped the tank down in order to see the top of the fuel pump and the fuel lines, started the truck up, checked around, and couldn’t find any leaks. But, at the top of the tank near the front corner, there is a plastic 90 degree elbow sticking out. I looked around, and then found a plastic vent line that was left hanging.
How is fuel venting done on a GM Truck?
The gas cap is sealed, the venting is done through the line Tim mentioned. There are three lines to the tank. 3/8, 5/16, and 1/4 inch. 3/8 is the supply line. Fuel is pumped through this line from the tank to the fuel metering body. (No TBI on a 97 Vortec). The 5/16 returns excess fuel from the metering body back to the tank.
What kind of truck has a gas leak?
As luck would have it, gas is leaking from the top front end of the main gas tank. Truck is an ’02 Avalanche, 2500 series with the 8.1 liter engine. Apparently this is a common issue with the GMT800 truck.
I’m also having this problem with my 2000 GMC Sierra SL c2500 5.7. It creates a vacuum and collapses the fuel tank. Im on my third fuel tank but didn’t realize at first a vacuum was crushing it. Any ideas? It seems the more I read, the more possibilities that could cause it but its getting expensive with the tanks and pumps.
I dropped the tank down in order to see the top of the fuel pump and the fuel lines, started the truck up, checked around, and couldn’t find any leaks. But, at the top of the tank near the front corner, there is a plastic 90 degree elbow sticking out. I looked around, and then found a plastic vent line that was left hanging.
Why does my GMC Sierra smell like gas?
If your GMC Sierra smells like gas, you should treat it as though you have a fuel leak until you for sure there isn’t one. The smell of gas is typically going to be caused by a bad gas cap, evaporative emissions system, overfilling the gas tank, or an actual fuel leak. But there are other, less likely causes as well.
As luck would have it, gas is leaking from the top front end of the main gas tank. Truck is an ’02 Avalanche, 2500 series with the 8.1 liter engine. Apparently this is a common issue with the GMT800 truck.
