Join Date: Jul 2011
Location: Monroe, Georgia
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In your picture the small round part to the right of the tank sending unit is what I believe to be either a vent or a roll over valve. I think there should have been a black rubber cap on it that you would have removed. You should be able to remove this part with a quarter turn to the left, I think.
My suggestion is to put the top of the tank back like you found it then cut the rubber vent hose between the tank and the filler neck and install a tee. Run your on the bed fuel pump to the tee. I suspect that will cure all of your problems. The valve in the top of the factory tank may need to be replaced. Maybe someone else will chime in on this.
The hiss is built up pressure that is not being vented.
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