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Going off memory here, but didn't you find debris in the upper fuel bowl and the HFCM? What were the conditions of both fuel filters last time you changed them out?
Going off memory here, but didn't you find debris in the upper fuel bowl and the HFCM? What were the conditions of both fuel filters last time you changed them out?
Both looked "normal" as far as replacing used filters. Nothing out of the ordinary. Usually dirty look.
Considering the age of the vehicle, the contacts of the embedded fuel pump relay may be excessively pitted, which on some occasions would provide a lower voltage. The resistance of the HFCM pump is 1 ohm, so it will be rated as a 12a device, the fuse gives cover over that. Also, any issues with corrosion on the many positive side connections (under the master cylinder) can be an issue, the harness connections down at the fuel pump, or the ground to the body tub just above the master cylinder at the firewall.
Any harness damage breaking the strands of wire can also be a problem, but those are typically constant.
Considering the age of the vehicle, the contacts of the embedded fuel pump relay may be excessively pitted, which on some occasions would provide a lower voltage. The resistance of the HFCM pump is 1 ohm, so it will be rated as a 12a device, the fuse gives cover over that. Also, any issues with corrosion on the many positive side connections (under the master cylinder) can be an issue, the harness connections down at the fuel pump, or the ground to the body tub just above the master cylinder at the firewall.
Any harness damage breaking the strands of wire can also be a problem, but those are typically constant.
Thank you TMT. I will check all of that before I condemn the new fuel pump. How can I check the pump itself to rule that out? As always, your time and interject are greatly appreciated.
With the pump, it will be how it runs, which may necessitate if you still have a warranty on it. A low voltage situation tends to draw higher amps and overheat. The same happens with starters if you have low battery voltage.
There is some variation in where the circuit pins are with all the plugs under the master. It's a crazy pathway and changes depending on where the fuel heater relay is located in the pre 2005.5 trucks. It's best to pull all these apart and look for issues. There is another by the fuel pump.
With a voltmeter in the cab, you can monitor the pump's voltage, splicing in a wire at the harness just before the connector and running it into the cab. A good check is also to see if there is any burning at the pump's contacts due to a poor connection.
But it might not be there, it may be the fuel relay. Unless you are the unluckiest person with the failed pumps.
Just got truck up and running again. I ended up getting the whole HFCM. The original was in bad shape. Drain plug was badly corroded, and appeared to be leaking. Everything works again.
I looked for burning at the pump and didn't notice any. Harness was tight when I went to pull it off. The pump itself, the head of the pump seemed very wobbly at it's connection to the pump. I'm not sure if that has any bearing on anything. The new HFCM came with a new harness. From what I can see, the wiring from under the hood to the pump harness looks okay. Anything else I should watch for with the newer install? Thank you and @TheRealRaf for your help today! Much appreciated.
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