318 Can't keep fuel in filter, stalls when hot.

I agree with loosening cap when it starts acting up.
And you are better off to wrap the header instead of the fuel line. Im running a el cheapo facet pump on my 360/thermoquad and it seems to provide enough fuel. If i let it idle too long when its hot, it will start running rough and pump gets loud. Like its running out of fuel. I think its vapourizing.