Compression Ignition Addict
Join Date: Sep 2011
Location: Newellton, LA
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What do you mean he turned it down to 400?
I just had my HPOP replaced about 3 months ago. Mine did the same thing as you are seeing when it first started. It progressively got worse, rather quickly, until it would not start at all over 125 ECT. With the new pump my psi is 600 - 650 at idle. I am putting my money on either a HPOP leak or a bad pump.
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2012 F250 Lariat CCSB FX4, Gooseneck and 5th wheel prep package, H&S Minimaxx, 5" AFE SS straight pipe, EGR delete with factory EGT sensor, 35" Toyo MT's on stock rims, and Bilstein 5160 shocks.