Won't start after fuel filter change

bpb424 · Dec 25, 2013

Changed fuel filters last night and I was in a hurry and forgot to cycle the pump before starting.
I'm pretty sure I have air in my lines, but the weird thing is I can hear the pump priming when I key on, but no fuel is filling the bowl.
When I open the water separator no fuel comes out either.
I don't know if the filter isn't seated correctly or what's going on.

Gary · Dec 25, 2013

Double check everything, make sure the filter is installed correctly.

forcefed6.4ford · Dec 25, 2013

Check the oring on the fiilter cap. It's easy to nick and you could be sucking some air.

ghohouston · Dec 25, 2013

Did you pull both filters at the same time?

bpb424 · Dec 26, 2013

Yea I pulled both at the same time.
I'm thinking I got air in the line, but I can't get the hfcm to even full up.
I'm gonna take out the filter again to make sure it isn't seated wrong.

kyle43335 · Dec 26, 2013

turn the key on and let the pump cycle multiple times. air is entrapped into the system. do this 8-10 times. should start.

superstroked · Dec 26, 2013

kyle43335 said:
turn the key on and let the pump cycle multiple times. air is entrapped into the system. do this 8-10 times. should start.

this should get it going...you will hear the air bubbles at the filter under the driver seat when cycling.

ghohouston · Dec 26, 2013

If you had both out at the same time, you just let a **** ton of air in your lines. I always do the lower first. Then pull the upper and cycle the key a few times to bleed the air

bpb424 · Dec 28, 2013

Been cycling the ignition a sh*t load and when I open the drain on the water separator I still get no fuel. Sometimes I get a little puff of air but that's it....
Any help?

ghohouston · Dec 28, 2013

Either pull your upper fuel filter, which seems like the quicker way, and cycle the key until you start gettingfuel to the bowl, or there is a schrader valve near the fuel cooler that you can attatch an air chuck and small hose to, to drain some of the fuel and not get it all over the engine, if and when it gets there

bpb424 · Dec 28, 2013

Took apart my water separator and found this was torn. Not sure if it's the culprit but I'm ordering a replacement to see if it helps.

bpb424 · Jan 11, 2014

Truck is still down I need some help.
I can hear the HFCM pump running when I key on, but when I open the separator nothing comes out. No fuel is getting to the fuel bowl either. I open the banjo bolt on the fuel cooler while keying on and no air bubbles, no fuel comes out at all

I have about 1/4 tank of fuel.

Looking for some help, I'm out of ideas

ghohouston · Jan 11, 2014

Time to drop the fuel tank homie

bpb424 · Jan 11, 2014

^
Why's that?

bpb424 · Jan 12, 2014

Bump
Need some help with my LPFP

cw96stroker · Jan 12, 2014

I don't know much about 6.4s, but maybe ghohouston was saying to drop the fuel tank because somehow its not picking up fuel from there. Like the 7.3s having that lil plastic foot break off where you can't suck out any more fuel once you get done to about a quarter tank without it. Maybe the 6.4s have a similar common problem like this? Maybe you could either drop the tank an take a look or try getting some more fuel into it to see if it will start pumping it? Sorry I am not of much help.

TD-5 · Jan 12, 2014

Just a few suggestions, From what you describe your HFCM pump will not prime, but is was fine before you changed filters.Time to start back to the beginning, Check everything on the suction side of the pump that you might have disturbed. Because that module is in such an Assanine spot, is the filter cap seal seated properly?, Did the suction line connection at the module get muscled around when changing the filter & now its sucking air.
How full is the fuel tank?, maybe the pump is weak & it cannot lift fuel from the tank if its almost M/T. Or maybe there is a problem at the tank connection or with the in tank pick up.

bpb424 · Jan 12, 2014

Thanks for the advice TD-5. You are correct, it worked fine prior to removing the filter.
I have a feeling the pump is weak. I took the cover off the hfcm to mKe
Sure nothing was clogged. I have re-removed the filter numerous times and still nothing.
I believe I am going to buy just a new pump (not the whole hfcm) and go from
There