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The Terminator
Engine/Tuning
Help diagnose fuel/alternator issue
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<blockquote data-quote="hasonic" data-source="post: 16474597" data-attributes="member: 199193"><p>Thanks for all the suggestions guys. so i traced the fuel pump wiring system from fuse on engine bay all the way down to connector on the tank right before the pumps. all the wiring had 13.5 +/- volts up to the BAP (BAP is pre FPDM) after the BAP the wiring was 18 volts up to the fuel pump connector.</p><p></p><p>What i did notice was that the voltage from the red and black wire that connects the pump to the FPDM was all over the place from 1 volt to 11 volts just swinging wildly. isn't this the ground wire for the pump?</p><p></p><p>I have no clue if these are original pumps but the car makes 599rwhp so not sure. And yes i am looking into a return system but not sure if to do so now or later.</p><p></p><p>while checking the fuel pump connector i saw one of the wires had a 5.2 volt reading so im guessing thats what you're talking about, correct?</p><p></p><p>I did notice the my iat sensor is not plugged into the intake, is that a common thing when modding, i have a jlt intake.</p><p></p><p>I also noticed the FPDM got hot enough to where you touch it for a few seconds you have to let go.</p><p></p><p>At this point i am really leaning towards the fuel pumps, unless the 02's are going bad but my short term fuel reading are both even on my sctx4. I dont think a fuel filter will cause such fluctuations</p><p></p><p>Any other suggestions before i drop the tank?</p></blockquote><p></p>
[QUOTE="hasonic, post: 16474597, member: 199193"] Thanks for all the suggestions guys. so i traced the fuel pump wiring system from fuse on engine bay all the way down to connector on the tank right before the pumps. all the wiring had 13.5 +/- volts up to the BAP (BAP is pre FPDM) after the BAP the wiring was 18 volts up to the fuel pump connector. What i did notice was that the voltage from the red and black wire that connects the pump to the FPDM was all over the place from 1 volt to 11 volts just swinging wildly. isn't this the ground wire for the pump? I have no clue if these are original pumps but the car makes 599rwhp so not sure. And yes i am looking into a return system but not sure if to do so now or later. while checking the fuel pump connector i saw one of the wires had a 5.2 volt reading so im guessing thats what you're talking about, correct? I did notice the my iat sensor is not plugged into the intake, is that a common thing when modding, i have a jlt intake. I also noticed the FPDM got hot enough to where you touch it for a few seconds you have to let go. At this point i am really leaning towards the fuel pumps, unless the 02's are going bad but my short term fuel reading are both even on my sctx4. I dont think a fuel filter will cause such fluctuations Any other suggestions before i drop the tank? [/QUOTE]
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Help diagnose fuel/alternator issue
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