dont open up the fuel pump. Just get a soda bottle, make a hole in the cap, attach a fuel line hose.
Wrap the part where the hose goes through the cap with electrical tape about 20 times. This will seal it.
Use this as your fuel source whenever you have a funny engine issue. You can't believe how much trouble comes from that fuel pump. This is the only way you will know for sure.
My Z was doing the exact same thing and the fuel pump was working!! I thought well it pumps fuel? The fuel was not enough....just as you describe.
If I would go 3/4 to full throttle for a length of time it would bog and act like its running out of gas. If I took the hose off while running gas would pour out...but it was not enough to feed the carb at high throttle.



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I tried new gas today and it is still running like crap. Ill wait entill i get the eletrical
1985 With "86" Plastic's,Custom 12" Alluminum Extended Swing Arm,39MM PWK,"TRX" Filter,9 Paddle TALLER HALLER'S on 11" Wide Rim's,LOT'S of Stainless,LOT'S of Alluminum,LOT'S of PowderCoating,NOTHING Stock..