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Jeep Wrangler YJ
YJ General Discussion
Fuel pump not priming
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<blockquote data-quote="Whyjay93" data-source="post: 434054" data-attributes="member: 20157"><p>Hi all, I’ve just finished putting a 95 5.2 magnum into my 93 YJ. when I turn the key to ON, the fuel pump doesn’t prime.</p><p>It cranks over, but the fuel pump is not working. I used a 95 ram PCM with the factory Jeep 4.0 harness. I simply added 2 wires to Jeep harness for the 2 extra injectors (7,8) and spliced the ASD wires for those injectors. Every other wire is exactly as it was with 4.0 ,just lengthened or cut down to fit. I can jumper wire the fuel relay and the pump will work . Both PCM’s (ram,Jeep) Pinouts read as though each cavity performs the exact same function, so I assumed splicing in the extra 2 injectors would be the simplest way. Also, I’ve grounded the neutral safety switch (ram pcm was auto) and the ground wire coming for the pump.</p><p></p><p>Did I assume wrong with the pcm cavity’s performing the same function? Or is there something I have overlooked? </p><p>thanks</p></blockquote><p></p>
[QUOTE="Whyjay93, post: 434054, member: 20157"] Hi all, I’ve just finished putting a 95 5.2 magnum into my 93 YJ. when I turn the key to ON, the fuel pump doesn’t prime. It cranks over, but the fuel pump is not working. I used a 95 ram PCM with the factory Jeep 4.0 harness. I simply added 2 wires to Jeep harness for the 2 extra injectors (7,8) and spliced the ASD wires for those injectors. Every other wire is exactly as it was with 4.0 ,just lengthened or cut down to fit. I can jumper wire the fuel relay and the pump will work . Both PCM’s (ram,Jeep) Pinouts read as though each cavity performs the exact same function, so I assumed splicing in the extra 2 injectors would be the simplest way. Also, I’ve grounded the neutral safety switch (ram pcm was auto) and the ground wire coming for the pump. Did I assume wrong with the pcm cavity’s performing the same function? Or is there something I have overlooked? thanks [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Fuel pump not priming
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