Yes. It is a very common setup among the 86-88 trucks. The intank pump is a low pressure, and the frame rail is high. The canister between the 2 pumps is a resivour for the high pressure pump. The only fuel filter you should have is the front one near the exhaust manifold on the drivers side, directly after the high pressure pump. Also double check your grounds and that you're getting power to the pump itself.
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