| 96 NA stock. I've noticed that during idle after the initial 30 seconds of high pressure on the NA at start up the FPCU will cycle the fuel pump to high for a second or two and then drop it back down to low. During cruising I can hear the pump flip onto high soon as I press on the accelerator and switch back to low when let off. Sometime it does some times it doesn't. I can audibly hear the pump buzzing, I replaced it with a new OE TT pump and while a lot quieter its rather noticeable on high. I've put in a new OEM fuel pressure regulator to address a different issue. I also checked my FPCU soldering for anything spotty and found the grounds were a touch spotty so I reflowed the solder and continuity is steady - that cut back on the noise too oddly. I am trying to figure out why my FPCU would be cycling my pump between high and low during idle and why during cruising is it on high?
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