Quote:
Originally Posted by brzlegend
You ever wonder why every OEM manufacturer uses pwm control plus the majority of standalones?
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Most bigger aftermarket pumps use or highly recommend a relay, or use a hob switch triggered at set vacuum or boost to trigger higher volt/output or if a dual pump setup a hob switch to activate the second pump.
Most quality aftermarket pumps have no issues running at 100% all the time. They are designed to.
The reason oem use controller is probably for numerous reasons, heat being one,
in-tank pressure regulators probably can’t regulate enough when pump is at 100% and fuel consumption is low IE at idle is another.
Cost and simplicity is another, and probably trying to use and design something that can run for 200k miles with no issues in an oem setup.
You can also get aftermarket controllers wired into the relay if you really wanted.