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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="MalcolmV8" data-source="post: 14160450" data-attributes="member: 8854"><p>That does sound familiar. I'll double check my tune and current notes on it when I'm at my tuning computer. What I gave you yesterday was from my work book notes I made years ago when I started tuning and had it close by for handy reference.</p><p></p><p></p><p></p><p>Again it's hard to follow exactly what you're doing when you say you removed some terminals from a harness etc. Some of the short comings of doing things over the internet <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>But if you're bypassing your FPDM and taking the wires directly from the ECU that won't work. The ECU sends very low powered signals to the FPDM telling it what to do. Those signals do not carry enough power to energize your relay. You must leave the ECU connected to the FPDM as stock and allow the FPDM to control your relay.</p><p></p><p>Again put everything back the way it should be. Let the ECU control the FPDM and leave all the wires there in tack.</p><p></p><p>Simply take only these two wires</p><p></p><p>Pin 10 = BN/PK (normally fuel pump positive)</p><p>Pin 3 = RD/BK (normally fuel pump negative)</p><p></p><p>They normally go from the FPDM to the fuel pumps. Use those to activate your relay.</p><p></p><p>Think of those two wires running from the FPDM down to the pumps.... trace them.... half way there cut them and attach to your relay instead of to the fuel pumps. It's really that easy.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 14160450, member: 8854"] That does sound familiar. I'll double check my tune and current notes on it when I'm at my tuning computer. What I gave you yesterday was from my work book notes I made years ago when I started tuning and had it close by for handy reference. Again it's hard to follow exactly what you're doing when you say you removed some terminals from a harness etc. Some of the short comings of doing things over the internet :) But if you're bypassing your FPDM and taking the wires directly from the ECU that won't work. The ECU sends very low powered signals to the FPDM telling it what to do. Those signals do not carry enough power to energize your relay. You must leave the ECU connected to the FPDM as stock and allow the FPDM to control your relay. Again put everything back the way it should be. Let the ECU control the FPDM and leave all the wires there in tack. Simply take only these two wires Pin 10 = BN/PK (normally fuel pump positive) Pin 3 = RD/BK (normally fuel pump negative) They normally go from the FPDM to the fuel pumps. Use those to activate your relay. Think of those two wires running from the FPDM down to the pumps.... trace them.... half way there cut them and attach to your relay instead of to the fuel pumps. It's really that easy. [/QUOTE]
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How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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