Why wont this thing start?
Cargo Master
Joined: May 2004
Posts: 3,007
Likes: 5
The fuel pump regulator should be on the fuel distribution line, near where the fuel lines come up from the frame, rear of the engine with a vacuum line running to it. Round shaped.
Sounds like the intank pump is working, it's low pressure to fill up the resivoir for the high pressure pump on the frame.
Battery disconnect should clear codes but wait 15-30 min.
Sounds like the intank pump is working, it's low pressure to fill up the resivoir for the high pressure pump on the frame.
Battery disconnect should clear codes but wait 15-30 min.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The FPR is mounted on the fuel rail on the drivers side of the engine near the back.
It is round with a vacuum hose coming out of the top.
If the tank is over about a 1/4 tank, the HP Pump is primed, the Selector valve is lined up with that tank and you do not go up any hills then yes it will run OK without the in-tank pump.
That is not the right way to it unless you changed a sensor then you should do it that way.
Thread Starter
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Junior User
Joined: Apr 2008
Posts: 60
Likes: 1
Ok..so, we're back at it again and before I begin I just wanted to thank you all for the help you've given me and particularly subford for all the time you've put into writing up these replies, we truly appreciate it.
So, we've determined that the in tank pump is definitely bad..we're gona get to that a little later.
For now we are still dealing with the seemingly reandom non-starting issue...however, we think we've figured something out.
If we wait till the truck has cooled back down for a while it will crank up and keep on running, but if we try and fire it up right afterward it wont fire for even a moment.
What could cause it to keep from firing when it heats up? We have spark, we have fuel pressure, the fuel pressure drops a bit while cranking which leads me to believe that the injectors are opening and from a previous post I stated that they do have power running to them.
What the heck could it be?
So, we've determined that the in tank pump is definitely bad..we're gona get to that a little later.
For now we are still dealing with the seemingly reandom non-starting issue...however, we think we've figured something out.
If we wait till the truck has cooled back down for a while it will crank up and keep on running, but if we try and fire it up right afterward it wont fire for even a moment.
What could cause it to keep from firing when it heats up? We have spark, we have fuel pressure, the fuel pressure drops a bit while cranking which leads me to believe that the injectors are opening and from a previous post I stated that they do have power running to them.
What the heck could it be?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The injectors will have power on them (red wire) when the key is on and the Power Relay is picked.
The computer then grounds the other wire on the injectors to fire them.
Are you sure you have spark when it will not start and do you hear the selected fuel pump run for one second when first turn on the key when it does not start?
Most of the time when they do not start when hot it turns out to be the PIP sensor or the fuel pump.
The computer then grounds the other wire on the injectors to fire them.
Are you sure you have spark when it will not start and do you hear the selected fuel pump run for one second when first turn on the key when it does not start?
Most of the time when they do not start when hot it turns out to be the PIP sensor or the fuel pump.
Thread Starter
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Junior User
Joined: Apr 2008
Posts: 60
Likes: 1
Yeah, when I test for voltage on the injector wires it fluctuates from 0 to 5 volts while trying to start. We do get spark while trying to start and the fuel pump also is runing and we have good pressure..in fact, now the fuel pump wont shut off until we disconnect the battery.
Newbie question: What's the PIP sensor? (I may have asked this before but my brain isn't responding well right now)
"and the Power Relay is picked" does that mean the same as like switched..sorry, just never heard the terminology before.
Thanks again for the help.
Newbie question: What's the PIP sensor? (I may have asked this before but my brain isn't responding well right now)
"and the Power Relay is picked" does that mean the same as like switched..sorry, just never heard the terminology before.
Thanks again for the help.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Picked means the relay is on or made.
The PIP sensor is mounted on the distributor Stator and sends a information train to the ICM and also the Computer to tell the computer the position of the engine (where the rotor in the distributor is pointing) so it knows when to tell the ICM to fire the coil and it also knows when to fine a bank of injectors.
PIP: Profile Ignition Pickup.
The PIP sensor is mounted on the distributor Stator and sends a information train to the ICM and also the Computer to tell the computer the position of the engine (where the rotor in the distributor is pointing) so it knows when to tell the ICM to fire the coil and it also knows when to fine a bank of injectors.
PIP: Profile Ignition Pickup.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Yes the PIP wire should have a small about 7 volt AC voltage on it.
For more information on the PIP you might want to read these two PDF files.
http://www.wellsmfgcorp.com/pdf/counterp_v8_i2_2004.pdf
and
http://www.wellsmfgcorp.com/pdf/counterp_v8_i3_2004.pdf
/
For more information on the PIP you might want to read these two PDF files.
http://www.wellsmfgcorp.com/pdf/counterp_v8_i2_2004.pdf
and
http://www.wellsmfgcorp.com/pdf/counterp_v8_i3_2004.pdf
/
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