Fuel Pump Waveforms

Here's a strange one, 98 GMC Sonoma 2.2 4cyl with only 3k miles. looks like just over 13ms at 7.5amps, regulator at rest.

Can you see a pattern? 9.2ms, 6521rpm

These have o2 on the circuit, always check the diagram. 94 Jeep 4.0 6cyl 51k miles

Dropped a full amp after unhooking o2, another strange one, about 12ms, 5k rpm

Replacing fuel filter netted this, dropped a quarter amp, slight change in rpm.

96 Chev 1Ton Van 5.7 Vortec 47k miles, fuel pump current, 33.4ms 1796 rpm 57psi, weak pump, intermittent no start.

85 Buick 3.8 V6 95k miles, Fuel pump current, 15.5ms 3870rpm 31 psi, weak pump.