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I’m pretty sure everyone who is selling new HFCMs is just private labeling them from Parker-Hannifin Racor division, so it’s an OE pump.
As far as the noise you hear from the tank, I can see two possible reasons. Low fuel in the tank or air being sucked into the line from either a cap/o-ring issue or the line connections either at the pump intake or line attachment at the top of the tank. In 17 years of being active in Powerstroke forums I can’t think of once ever reading about the connection at the top of the tank being an issue.
I’ve had a slow reaction with my fuel sendor a few times, not enough to cause me to go through the work of dropping the tank and replacing an expensive sender, but they do wear, corrode, and get funky. So having a variation in level without the necessary fuel usage can happen.
This is what the fuel sender/pickup/return looks like.
The pickup foot has a side valve to it for an icing condition, where heavier then the fuel water resides at the bottom of the tank, freezes, then blocks the screen pickup. The icing side valve opens under excessive suction and allows fuel to be drawn in above the ice dam. When the valves fail, nd they do, a low fuel level draws in air, lowering fuel pressure.
To the left of the foot is the return line along with a “duckbill” valve, something I have never fully understood in purpose, but manufacturers don’t spend a penny on installing something without cause. If the system is drawing in air and you have a 1/3 tank or more of fuel the air will bubble through the fuel and you can have that particular sound. However if fuel is air free and just low in the tank you can hear the returning fuel splashing into the lower level of fuel, similar to what we hear every morning after we waken and hit the head. Hey, I’m looking for the easiest reference.
A long explanation into what may be occurring, and a long dissertation to agree with Euroman that confirming at least a half a tank of fuel would at least eliminate a low fuel or side valve failure causation. And if you still hear bubbling, an air leaking situation.
Unfortunately the best way to confirm if there is an issue with the new pump is to first check that the intake line is firmly connected to the HFCM, and if that doesn’t solve it, flip back to the old pump that at least had some pressure.
i just thought of something else. When the intake line was removed from the old HFCM was it a situation where fuel kept running out? If the tank is full and has had fuel being pumped, removing that line will have a continuous drawing of the tank. Even though the pathway loop goes above the tank, a full tank had the fuel level higher then the open line so it works like siphoning out a cars fuel with a long hose. If the tank level is low, the tendency is to just drain the existing fuel in the line then stop. Not only will this leave the line filled with air, but with a new HFCM it would be operating dry (and noisy). I’ve not had one of these pumps apart so I don’t know if they are self priming. If they are not, that could be a reason for the new one not pumping. Adding fuel into the intake port tube of the new HFCM may prime the unit if it’s necessary.
I need to back and re-read this thread.
Edit - Now that I went though the thread the gurgling during priming was probably the air being discharge into the fuel, which is normal.
Other notes, post videos to YouTube, then link to here.
The 52psi pressure reading reading may be the normal 55psi if the pressure gauge calibration is off. Unless I knew the calibration of the gauge for sure I would not condemn a 52psi output for a no start condition. These motors have started and run down the road with pressures in the 40’s.
With the new HFCM is installed I would confirm there is a main filter in it, it is installed correctly and that the O-ring is good. I have reused O-Rings as long as they are not abraded or nicked.
I can confirm that there is fuel in the tank. I filled the tank and drove home the last time the truck was running. Torque app also shows 84% in tank.
I didn't replace the whole HFCU, just the pump itself. As part of Mark's troubleshooting i did pull the fuel supply line, and yes it acted as a siphon. I replaced the fuel filter as a part of my troubleshooting process along with the o ring, and it is installed/ seated properly.
Three different O-Rings that need to be lubed before going in, the end one on a piston that is spring loaded. So the housing needs to be cleaned to get the last one to seat, and I would check them all to make sure they have good integrity. If they are OK I think you have to confirm with another pump. Salvage yard ones typically sell for under $100, often like $75.
I'm an R&D guy, but despite a few hundred thousand dollars of test equipment in the facility, it all comes down to trial and error. I don't know how else to check this, unless someone else has an idea.
Thank You for your input. I am pulling the HFCU down today to clean and double check the pump install. I can't put anymore money in the truck until payday, but need it running before then. Typical catch 22.
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