Join Date: Nov 2010
Location: South Fayette/Pittsburgh PA
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which standpipes did you have? 2005s came with 04 style(square) or 05+ style(hex). Both have check valves but in different places.
The 05+ standpipe can be easily disassembled and you'll quickly see it's not what you think it is . It's not for drain back purposes but rather to subdue the oil pulses from the high pressure pump
Ford Senior Master Tech
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2015 F-250 XLT 6.7L
2006 F-250 6.0L SOLD