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The Terminator
Engine/Tuning
Help diagnose fuel/alternator issue
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<blockquote data-quote="hasonic" data-source="post: 16473302" data-attributes="member: 199193"><p>Hello guys hope you're all doing well. I been doing some research in the forum and im kinda of narrowing it down to possible fuel pump issues but want to get second opinions before i start going crazy and rip everything apart.</p><p></p><p>I bought the car about 2 months ago. Car was running very well, good drive ability and solid power across the board. Long story short alternator took a massive dump on me.</p><p></p><p>Now, i replaced the alternator with a kenneth miley 3g/3.2 pulley and the big 3 wire of my own. When cold it holds 14.5/14.4 at the battery post and about 13.9 to 14.0 at the sct4. after it warms up it starts to drop the more things i turn on all the way down to low 12s and even dying on me.</p><p></p><p>Now i was checking my sct out and started noticing that my fuel pressure was mid teens and my fuel pump duty cycle was jumping from .20ish to .50 as my pump voltage would jump from 13.5 to 6 volts. So i did a log with the car completely cold assuring good alternator voltage and no accessories on. hoping some can point me out in the right direction.</p></blockquote><p></p>
[QUOTE="hasonic, post: 16473302, member: 199193"] Hello guys hope you're all doing well. I been doing some research in the forum and im kinda of narrowing it down to possible fuel pump issues but want to get second opinions before i start going crazy and rip everything apart. I bought the car about 2 months ago. Car was running very well, good drive ability and solid power across the board. Long story short alternator took a massive dump on me. Now, i replaced the alternator with a kenneth miley 3g/3.2 pulley and the big 3 wire of my own. When cold it holds 14.5/14.4 at the battery post and about 13.9 to 14.0 at the sct4. after it warms up it starts to drop the more things i turn on all the way down to low 12s and even dying on me. Now i was checking my sct out and started noticing that my fuel pressure was mid teens and my fuel pump duty cycle was jumping from .20ish to .50 as my pump voltage would jump from 13.5 to 6 volts. So i did a log with the car completely cold assuring good alternator voltage and no accessories on. hoping some can point me out in the right direction. [/QUOTE]
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Help diagnose fuel/alternator issue
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