Where is the fuel pump located on a 1984 B2000?

I am going crazy! I cannot find the fuel pump on my 1984 B2000!
I have been up and down the frame and nothing. All the manuals say there should be an electric pump mounted to the frame near the fuel tank. I have not been able to find it.
Can anyone help?

On my '88 B2200 I have a mechanical fuel pump located under the air cleaner, bolted onto engine on passenger side. Autozone.com shows an electrical fuel pump for your '84 B2000, and its repair guide states: "On all models through 1984, the pump is mounted on the left frame rail adjacent to the fuel tank." Look on the INSIDE of the frame rail - that's where it is on my '98 Frontier, and I had been looking on the outside of the frame rail there. Here's the picture autozone.com shows http://www.autozone.com/N,14900078//shopping/partTypeResultSet.htm