Check it at the fuel filter location which is behind the drivers door under van inside frame rail. I have seen it above the right rear axle on a van. Return line (low pressure) fitting is right next to fuel filter. Remove fuel filter and blow. If it's hard to blow through, replace and drive it to see if it made a difference. If so, your good. If not, check fuel pressure.
Man, you really know your stuff
. My filter was above the right rear axle. The filter didn't seem too terribly bad but I still went ahead and replaced it anyways. I also replaced two really cracked/leaky vacuum hoses. The problem still persists and actually seems a little worse now (gotta double check if I got that filter in right. Knowing me it's probably in backwards or something )
Van still just feels really rough and wants to die out on acceleration. Feels weak/no power. I actually rented one of those fuel pressure testers from the autostore but have yet to figure out how to use it (good thing there's no time limit on how long I can keep it, hah) But once I figure that out I'll check fuel pressure.
All advice is definitely welcomed and appreciated!