I ran a clear line from the tank pickup unit to the hfcm and a clear line from the engine side of the hfcm to a container all other lines are on their normal connections.
I had pulled the pickup unit out earlier, it looked new.Ahh, then cap both return ports on the HFCM, likely pulling air from the return, either thru the tank or the filter housing
The low flow is concerning, just had mine off a while back to check how low it would go before I was out of fuel (138 miles ...lol)
anyways the fuel flowed out of the line about 2-3 inches with the line horizontal
this all depends on if you have a restriction in the tank or in your line adapter
you could place the end of the clear line an a clean container to see if the pump flow increases
The pickup foot is gone in my tank, that is why it runs out of fuel at 138 mile -- the after market foot is not of quality so I am told
so looking into a sump kit, or possibly making a sump -- I have the tools
just can't see boring a 3 inch hole in my tank, ...lol
There is not a torque on the filter cap -- it is until it stops turning, there is a stop on the threads unless it has been brokenI checked the amount of fuel it pumps when cycling the key on. I cycled it twice it pumped out just under 8 ounces of fuel.
I also rechecked to make sure I had the right torque on the cap.
I'm not sure if I need to mess with the air bubbles too much more at this point. If it looks like I need a new pump, I'll end up going through the hfcm anyway.
I had the same flow out of the hfcm after bypassing the factory lines from the tank pickup to the hfcm.Here’s my favorite fuel trouble shooting video. I think it says also that the low pressure can be caused Be a clogged line from the tank to the pump and this explains how to check that.
When I first read the title, I thought this was a fuel injector related thing from the upper fuel bowl failing a bubble test.
I pretty much covered it in post #30.What’d you do to fix it?
You are right.You still don't know what risk you have incurred until you check fuel pressure............. And even then, the failure rate of a junkyard pump has to be higher than that of a new pump - making a fuel pressure gauge even more important. The 6.0L will run fine on fuel pressure that is pretty low - right up until an injector fails.
It was a time and weather issue.Yknow, the fuel pump by itself isn't that expensive, nor is the service kit for the hfcm. Why not just "rebuild" the one you took off?