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Power Strokes
6.4 Tech
LPFP not cycling
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[QUOTE="MT_Diesel, post: 1439746, member: 10422"] I started my truck yesterday morning and it started just fine. I let it warm up 10 min or so and when I went out to go the truck wasn't running. It was -3* outside but truck was plugged in and LE winter fuel additive in the fuel. I tried to start it and it cranked for 15 seconds and wasn't building rail pressure. I also noticed the LPFP didn't cycle. Today I waited til it was 17* in case the fuel was gelling yesterday. Turned the key on several times and no LPFP. I didn't bother trying to start it. It is a FASS titanium 125. Truck also has diesel Dr dual fueller. Thoughts on troubleshooting ideas? I'll check the fuse but that'd be too easy. Any other procedures? If it needs replacement, should I avoid the FASS? I'm aware of the troubles people have had with FASS and air dog. Would the fuel lab pump be a better replacement, and if so any chance it would work with the FASS filter and separator? Finally, knowing the HP fuel system is made of glass in the 6.4, are there any precautions I need to take with fuel pump replacement? Definitely want to avoid HP issues. Any help is appreciated!! [/QUOTE]
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