sleeper
Former LOD President
I presume you have checked the fuel line(s) for restriction. The most common place is the lower fender rail just behind the wheel well. It's has that stupid piece of plastic covering over the fuel line bundle. Sometimes all it does is hide the smashed line.
When I bought it I replaced the return line, 2 rear brake lines, and a vapor line because they were crushed, since i bought it with a collapsed suspension. I gave the feed line a good look and it looks fine, and a return line restriction would only raise pressure.
That reminds me, though, I should probably replace that piece of plastic.