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The Terminator
How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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<blockquote data-quote="Black306" data-source="post: 11445178" data-attributes="member: 4780"><p>Pin 1 is a duty cycle signal, that's why it wont work. When the engine is running, the ECU sends a duty cycle signal between roughly 5-50%. The FPDM then doubles that signal for fuel pump duty cycle. When you have key on engine off, the ECU sends a duty cycle signal of 75%. That basically tells the FPDM not to run the pumps.</p><p></p><p>Running pin 10 and ground didn't work cause the FPDM actually modulates ground, not hot.</p><p></p><p>As you mentioned, you can have an FPDM basically activate a relay to run the pumps. However, I would make sure that you can set a tune that basically makes the FPDM run at 100% fuel pump duty cycle when the engine is running to insure the relay says on when it should. If the tune is not right and tried to reduce fuel pump duty cycle enough, it could keep the relay from energizing and turn off.</p></blockquote><p></p>
[QUOTE="Black306, post: 11445178, member: 4780"] Pin 1 is a duty cycle signal, that's why it wont work. When the engine is running, the ECU sends a duty cycle signal between roughly 5-50%. The FPDM then doubles that signal for fuel pump duty cycle. When you have key on engine off, the ECU sends a duty cycle signal of 75%. That basically tells the FPDM not to run the pumps. Running pin 10 and ground didn't work cause the FPDM actually modulates ground, not hot. As you mentioned, you can have an FPDM basically activate a relay to run the pumps. However, I would make sure that you can set a tune that basically makes the FPDM run at 100% fuel pump duty cycle when the engine is running to insure the relay says on when it should. If the tune is not right and tried to reduce fuel pump duty cycle enough, it could keep the relay from energizing and turn off. [/QUOTE]
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How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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