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Re: Fuel pump relay....RPM limits
The MC14538 is a Motorola dual retriggerable one-shot. I no longer do
hardware design so I gave away most of my data books. A one-shot is
triggered by the ignition pulses to energize the fuel pump relay and
keep it energized as long as the ignition pulses continue. The other
one-shot probably determines the fuel pump relay cutoff frequency of the
ignition pulses. This would be easy to figure with the part data sheet.
If I find anything in my archives I will let you know.