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Yea, the pump is getting tired. Shouldn't see readings like that at all. It'll worsen, - I mean any day now.....lol
You can pretty much go by spec with the exception of 28 - 31 psi w/engine running. It should be 32-45 psi w/engine running IMO. But other that, anything outside of spec, specially anything as low as your posting is a strong hint the pumps going south. That's how they go out, they slow down get flaky then eventually begin to lock up on occasion.
Yeah, and it is getting worse, now sometimes even if I turn the key on for a moment first it still takes a while to start.
I have a fuel pump ordered (am chancing it with a Delphi pump instead of a Motorcraft, but hey, I like to live dangerously, and if it saves me $150, even better).
I still have half a tank of gas, so I need to drive around to burn some more of it off. Do not want to lower a tank with 12+ gallons of gas in it (and no, I can't remove the bed, the Supercrew has the pump under the cab, not the bed).
I plan on doing it Thursday though.
Yea, removing the bed isn't the way if you want easy and quick anyway.
You don't have to drive it out of fuel. At the back of the tank and on top is a vent with a hose connected. Has a pressure clamp on the hose. Squeeze the clamp move it back. Use WD40 and a couple small screw drivers to remove the hose.
Then w/WD40 spray some around the perimeter of the plastic vent. Grab the vent, turn counter clockwise one quarter turn and lift. Pops right out. Then you have an 1 1/2" opening to siphon the fuel from.
It's easy, - I do that sometimes for tractor gas...when I'm to lazy to run up town and fill the 5 gallon jug.
New fuel pump in, still doing the same thing.
Fuel pump, fuel filter, and regulator replaced, so I guess a stuck fuel injector is the only thing left (even though I am not noticing any smoke on start up or strong fuel smell).
Or is there something else I need to look at?
Your kidding! What else could it be ? Still, with the numbers your posted, that pump was on it's way out. Whew, -now I don't feel so bad lol.
You covered everything else. The regulator or plugs. The regulator test passed correct or you replaced it. The plugs - THAT's only possible if you run an off brand. Motorcraft plugs can have 200,000 miles on them and the damn engine will still start right up lol. You don't have wires correct ? I haven't read back but I think you have a 5four.
If I missed anything it would be the relay, but honestly have never seen or heard of a slow FP Relay.
It wasn't a waste. The average fuel pump has a 90,000 mile life expectancy. If you topped that, just another reason it wasn't a waste.
Iduno, maybe enplane the problem again, did you leave anything questionable out perhaps ?
Yes, it is a 5.4.
Plugs are Motorcraft with ~12,000 miles on them. COP boots and springs replaced when plugs were done. No codes or misfires. Truck runs just fine. Power is fine, no hesitation or such, idles smooth and drives like it always has with no noted change in MPG.
It just takes longer to start, but if I turn the key on for 4-5 seconds then start, it starts immediately. I have not checked fuel pressure since replacing the fuel pump assembly (will do it next time I am out and about near an autozone with a tester).
It all started after disconnecting the battery, which I think is just coincidental.
I need to find my SCT x3, I can run some diagnostic things with that since my OBD II bluetooth will not connect with my truck using the torque pro app.
Not familiar with the SCT, heard of it and know what it is. Maybe that could have something to do with it.
Yea because the PCM program for the misfire monitor on start is to shut down the rail after 4 seconds with a no start situation. It resets right away when keyed off. That's to protect the cats, helps prevent them form igniting. I have that info somewhere, think I know where....yea here, first paragraph blup -
The SCT has a monitor mode I can look at that can give me a lot of information on my laptop (don't remember off hand if it gives me injector info or fuel pressure and such).
I may return the PCM to stock and see if it changes anything. Problem is I have no idea where I put it almost a year ago...
10-01-2016, 06:49 AM
