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38 Posts
Hi Everyone, I am have a problem with my fuel delivery.
It started a week ago when the I started the truck on two seperate cool damp days and the truck idled poorly, sputtering and rattling. Once warmed up, the truck ran perfectly on both occasions. I had assumed bad plug wires or a coil issue, I saw that one lead had come out of it's socket and was laying on valve cover so I moved it.
The next day (dry and hot) I was driving down the highway loving my truck when it suddenly lost power, it was a very gradual slow down, engine misfiring and occaisonal sputter. I did not detect a bang or other mechanical sound.
When I tried to start the truck it would sputter, rough idle low for a couple seconds then die. This continued for a while, I got towed home.
At home I have confirmed that I do have spark so ruled out Crank Sensor. I checked for voltage at fuel pump and found that when cranking I had voltage. I replaced fuel pump (whole assembly) and still no go. After this I checked more closely and noticed that I do get power to pump while cranking, but not in Position 2 (no priming). The relay does not seem to be tripping in Pos2. I have swapped the relays around (for some reason 3 of my yellow relays are the same part number) and symptoms do not change at all.
I have no codes, engine cranks, will start using starting spray, does occasionnaly fire to life with low rough start but dies almost immediately.
Any ideas?
It started a week ago when the I started the truck on two seperate cool damp days and the truck idled poorly, sputtering and rattling. Once warmed up, the truck ran perfectly on both occasions. I had assumed bad plug wires or a coil issue, I saw that one lead had come out of it's socket and was laying on valve cover so I moved it.
The next day (dry and hot) I was driving down the highway loving my truck when it suddenly lost power, it was a very gradual slow down, engine misfiring and occaisonal sputter. I did not detect a bang or other mechanical sound.
When I tried to start the truck it would sputter, rough idle low for a couple seconds then die. This continued for a while, I got towed home.
At home I have confirmed that I do have spark so ruled out Crank Sensor. I checked for voltage at fuel pump and found that when cranking I had voltage. I replaced fuel pump (whole assembly) and still no go. After this I checked more closely and noticed that I do get power to pump while cranking, but not in Position 2 (no priming). The relay does not seem to be tripping in Pos2. I have swapped the relays around (for some reason 3 of my yellow relays are the same part number) and symptoms do not change at all.
I have no codes, engine cranks, will start using starting spray, does occasionnaly fire to life with low rough start but dies almost immediately.
Any ideas?