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Hey all!
Recently started in on installing the jms fuel booster on my 16' Z and ran across a question with regards to the fuel control module wiring as compared to the diagrams I've found in other threads...they don't match! Trying to confirm that I'm looking at the correct harness but there's not exactly a ton to choose from in the rear driver's wheel well area. Couple picks for reference below. Main concern is the power wire not matching.
Thanks for any help!!
My harness (hopefully correct one) Diagram found online
You're not in the right spot. I posted that diagram initially, it was meant to be tapped right at the fuel pump module itself, not at the connector. The module is behind the wheel well liner on the rear drivers side. Looks like this:
If you want to tap at the connector, its X350 but Im pretty sure thats above the trans and not easily accessed. Comes out between the two tanks. But again, thats not what the above diagram is showing
IIRC it is the fattest red wire with the green stripe. But as said above, you need to tap it right at the plug that plugs into the fuel pump control module. You want it as close to FPCM as possible to get the proper clean voltage to the FPCM. If you have to extend the wires on the JMS, be sure to use solder and use a thicker gauge wire than the JMS has in place. If you lengthen a wire you increase the resistance and need a thicker gauge to maintain the voltage flow. If you mess this up and crank up the voltage with too high of resistance, it can cause the FPCM to act up and drop your low side fuel pressure. Aim for 17.38 volts but no higher than 17.48 volts. Once you cross the 17.48 volts threshold, the FPCM isn't happy and stars acting up or you can actually cavitate the OEM fuel pump.
Thanks for the detailed info! Had already picked up some 10ga (matches JMS current ga) to extend the wires so will circle back for some 8ga prior to the install.
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JMS Booster install HELP
