Join Date: Nov 2000
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Re: Lack of power above 60 mph.
The spray pattern should look like its coming out of a spray bomb, even at idle, just that its pulsing.
The pump supplies the force, the bypass built into the throttle body provides the back pressure to get it to around 14 lbs/psi and the return line is necessary to allow unrestricted return to the tank. Leve says the stock return line is too small. From your description it is, but that would cause too high of pressure, not too low.
I'd start by T'ing in a fuel pressure guage on the input side of the TBI unit and looking for proper pressure. Its also possible it has nothing to do with pressure and its the tbi unit's injectors dirty.
Pressure low? pickup clogged, fuel line leaking on input side, pump faulty, filter clogged, voltage to pump low, regulator in TBI bad.