I think these guys have pointed you in the right direction. Testing at the pump will tell if there's any blockage/stoppage between the pump and the carb.
Also as mentioned the sock in the fuel tank collapsing is a somewhat common culprit.
I'm running a Holley red and have been for 4 or so years. It's never skipped a beat. but then again it costs about 4x as much as the one you mentioned. When i installed mine i plumbed it all with AN hose and fittings. A smart thing was installing a filter before the pump, and I installed a serviceable clear one in the engine bay right before the carb as well so I could see what was going on. I change out the pre-filter every year or two.
So, do you have to drop the tank to check that sock on an '89? I might as well check while I install the Holley Red this weekend.
Also, looking at BJ's sending unit... is the fuel sock you guys are talking about the "fuel pickup tube filter"?
http://www.bjsoffroad.com/Fuel-Level-Sending-Unit-br1986-1991-Grand-Wagoneer_p_842.html
Should be able to get it out without dropping the tank. There's an access panel under the rear seat if you fold it forward, which you should be able to pull the sending unit/sock out from. You might have to remove the carpet (I don't have rear carpet installed yet so don't know how far it extends).
So, do you have to drop the tank to check that sock on an '89? I might as well check while I install the Holley Red this weekend.
Also, looking at BJ's sending unit... is the fuel sock you guys are talking about the "fuel pickup tube filter"?
http://www.bjsoffroad.com/Fuel-Level-Sending-Unit-br1986-1991-Grand-Wagoneer_p_842.html
Check this out......it's 5 pages but it goes into getting into the fuel tank, I also posted about using a large axle nut socket to remove the sending unit. Page 4 is where I chime in.
http://www.fsjnetwork.com/forum/viewtopic.php?t=9766
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I'm not positive but methinks hours should have an access panel under the rear seat