Fuel Pump noise when X is OFF

[fatboy0186]

My truck has been running terrible lately. It runs rich, has a rough idle, CEL with a rich code, and pings like crazy. And yesterday, I noticed a few moments after cutting it off, the fuel pump cut on. Its a low hum, loud enough to hear from walking near the truck. After a while, it starts to hiss and pop too, like it is getting real hot. I've been disconnecting the fuse when I hear it cut on now. But tonight I was at a friends, and when I came outside it was humming and popping, and the truck wouldn;t start. It would cut on and then die. So I pulled the fuse, let it sit for a few minutes, and then it started up, ran for about 10 seconds and died. Finally, it started up and I made it home. I don't know whats happening. I just replaced the fuel filter, about 2 weeks ago, but I don't think it's leaking. Could it be the charcoal canister or the vent?

 

[mrboyle]

First off, the "rich" code actually means that the engine is running lean. This is also the reason you have a pinging problem! From the description it sounds like you have more than one problem. I really don't know where to start, but I recomend having the fuel pressure tested to determine what is happening with the pump.