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Power Strokes
6.0 Tech
Cleaned HFCM, now losing FP
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[QUOTE="6speedsd, post: 1305154, member: 1242"] Anyone want a dually? I've never had an issue frustrate me this much. It just doesn't make sense. New filters, o-rings and no help. Actually seems to have gotten worse. You rev it up in park and pressure drops. Was doing that before though. At idle, my gauges fluctuate 2-5psi up and down constantly...again, did that since issue started. What I don't understand is Everytime the pump cuts off, the system completely bleeds off pressure. You cut the key on, it slowly builds up to 55-60psi, pump cuts off, I immediately cycle the key, and it has to slowly start building pressure again from about 15psi. I know it drops when the pump cuts off, but it doesn't bleed that fast. I unhooked the feed line engine side of HFCM, hooked up a piece of hose, and ran it into a clear jug. Cycled the pump on, and it's bubbly fuel the entire pump cycle. Hooked that line back up, and removed the feed side before the HFCM from the tank. Again, put hose there and ran it into that jug of fuel, basically bypassing the tank and supply line...again, took a minute to build pressure. Cranked the truck, and my gauges fluctuate just like before. For whatever reason, something is going on inside the HFCM that shouldn't be. Only thing I haven't checked is return lines, but do I even need to? What could be sucking air, or leaking pressure, or a return line that would cause this issue? Isn't the return just gravity flow? Part of me wants to just bite the bullet and do a fuel system, but the missus ain't going for that right now. However, my only other idea is a new HFCM, which coincidentally, costs almost as much as a fuel system. Anyone see something I'm overlooking? Why is pressure bleeding off so fast after the pump shuts off? Sent from my iPad using Tapatalk [/QUOTE]
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Cleaned HFCM, now losing FP
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