Between Omaha and Des Moines, 7 miles South of I80 | bleedred - 1/9/2015 17:50 Thanks for the info. Looks like the fuel return check valve is a good place to start. We do have the hand priming pump. Question on that... I tried to hand pump it to help prime it to get it started and you have to pull it out and hold it or or sucks back in. Just like filling a syringe. It creates a lot of suction and you have hold it for 3-5 secs and then push it in. The other ones I have done this on you could just pump away. That is usually a sign of a restriction somewhere, or it could be that one of the one-way hand pump check valves, has come loose and flipped over. (See photo, for correct view = one check valve is pressed in , in one direction; and the other check valve is opposite. Note: Flow would enter the right side check valve, in this photo; then exit the left side.) Was the truck outside, with cold fuel{gelling}, or older fuel filters (= more restriction, right there, than Summertime) Was -12F just the other night, here.
 (CAT fuel hand priming pump_check valves_in paint program.jpg)
 (3406E fuel filter base_with red line casting.jpg)
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 CAT fuel hand priming pump_check valves_in paint program.jpg (40KB - 886 downloads)
3406E fuel filter base_with red line casting.jpg (31KB - 818 downloads)
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C15 fuel bleeds back...
