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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Strange noise 2020 gen 2
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<blockquote data-quote="FordTechOne" data-source="post: 1416653" data-attributes="member: 35543"><p>You just explained duty cycle I mentioned previously. I think you understand the concept, but the wording can be misleading. The pump never "turns off" in the traditional sense of the phrase, it simply receives a lower duty cycle as commanded by the PCM. I think you may have been implying this. On an oscilloscope, it may appear as if the pump is cycling on/off, but because of the rapid rate at which it cycles it's never considered being "off". I think you were eluding to the same basic principle; if I misinterpreted that than I apologize for the confusion.</p><p></p><p></p><p></p><p>Same principle; still uses a FPDM for the low side. The high side pump (High Pressure Fuel Pump/HPFP) takes the low side pressure and ramps it up to a maximum of 2150 PSI for the purpose of Direct Injection.</p></blockquote><p></p>
[QUOTE="FordTechOne, post: 1416653, member: 35543"] You just explained duty cycle I mentioned previously. I think you understand the concept, but the wording can be misleading. The pump never "turns off" in the traditional sense of the phrase, it simply receives a lower duty cycle as commanded by the PCM. I think you may have been implying this. On an oscilloscope, it may appear as if the pump is cycling on/off, but because of the rapid rate at which it cycles it's never considered being "off". I think you were eluding to the same basic principle; if I misinterpreted that than I apologize for the confusion. Same principle; still uses a FPDM for the low side. The high side pump (High Pressure Fuel Pump/HPFP) takes the low side pressure and ramps it up to a maximum of 2150 PSI for the purpose of Direct Injection. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Strange noise 2020 gen 2
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