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I have a 08 f250 king ranch it just died tonight going down the road no warning at all and it flashed the oil symbol when it died. I called a mechanic buddie of mine and he said it was the high pressure oil pump but looking at other forums people are saying the 6.4 doesnt have a high pressure oil pump. So im wondering if it doesn’t have that what could be wrong?
OP --- sounds like your mechanic isn't up to speed (understatement). The 6.4L can create enormous pressures (>20,000 PSI) in its fuel delivery -- be careful as these numbers can AMPUTATE fingers, TAKE AN EYE OUT. If you don't know what you're doing, don't go there.
With that said, here are some initial diagnostics:
--- Check for excessive fuel restriction, check or change fuel filter
--- Check low pressure fuel supply, should be 5-10 PSI
--- Check for air in fuel system
--- Confirm actual versus desired rail pressure, even under crank no start conditions
If above ok, move on to:
fuel injectors
high pressure injection pump (no high pressure fuel leaks) -- the pressure and volume control valves here also do fail on the 6.4Ls
plus the scan work........is it setting 87 and/or 88 (and more importantly what scanner is being used)?
The oil light on indication isn't all that helpful right now.
Ok so i added some fuel to the tank and took the forward fuel filter off and was able to see fuel coming into the filter cavity but it wasnt really like rushing in like it was under pressure and it was also bubbling is this normal or do i have air in the system?
Out of curiousity - how much fuel did you have in the truck? The '08-10 trucks were NOTORIOUS for running out of fuel when the computer said they had 50-75 miles left. My dad's '08 did it, my FIL's '08 did it, and I had it happen on a test drive of an '09.
They're a pain in the *** to get going again, too.
I'm almost betting you ran out of fuel. There's a process to get it going again, I don't recall how it goes because it's been a while since I've even had one of those trucks. Probably nothing wrong with your truck.
Word of advice, though, is to never let it get that low. Like I said, those trucks are NOTORIOUS for saying they have fuel left when they don't - or rather, when they can no longer pick it up.
So i have figured out i have sucked air in the lines whether it ran out of fuel or just sloshed around i dont know but how do i get the air out and get it going again?
If you suspect air trapped in the fuel system the best way to bleed it is to remove the return line from the HPFP at the fuel cooler and bleed it there. The return line is the rearward metal line closest to the firewall. Loosen the banjo bolt and turn the key on. Be ready with rags to catch the escaping fuel. Allow it to bleed until there is no more air coming out, just a steady flow of fuel. Tighten the bolt and see if it will start.
Normallh you just key on/key off until you hear the buzz of the luwer filter area that contains the pump shut off.
book say 6 times for the procedure. I supplest at least 6 times.
Also since all of this is going on, open the passenger front door, side of the dash, open the access door and check the fuel cutoff to ensure it is not tripped.
Normallh you just key on/key off until you hear the buzz of the luwer filter area that contains the pump shut off.
book say 6 times for the procedure. I supplest at least 6 times.
Also since all of this is going on, open the passenger front door, side of the dash, open the access door and check the fuel cutoff to ensure it is not tripped.
I assume your filters are motorcraft (oem).
This process did not work on my dad's '08, and he did it when the truck was 6 months old. It ended up going to the dealer, cost him about the price of a tank of fuel, and when he asked they said they had to manually bleed the lines.
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