94 need help

[MT-2500]

Originally Posted by CalifOkie

MT-2500 said....


What year make and modle and engine and engine code are you refering to here in this quote?

Quote
We found a wiring diagram of the Fuel Injection and Fuel Pump Control System that illustrated our point. We then went to my shop and got on my AllData Online computer to compare the data. To my amazement the diagrams are exactly the same. Which serves my purpose well so you can see it too.

I need to remind you this is the gm CK forum and the origional post is about a 94 CK truck.

All data and mitchell repair info is the same as and is copyed from the gm factory info repair info.

My Gm training has nothing to do with this post or my answers.
And should not be used for a pissing match as far as who has the most GM training.
__________________________________________________ ______________

My reply:
If you would simply take your time and carefully read my entire posting that you partially quoted. You would see that it is all about the 94 CK truck. Futhermore if you would simply look at that wiring diagram from AllData where I said you could find it, and follow it through with me step by step, it should become obvious to you that I am not attacking you.
If you weren't too busy to learn this valuable info that is ONLY available from GM that directly pertains to the truck in question and many others (also the disspelling of a widely accepted inaccurate myth), you would see that what I am offering is a valuable (high tech from the inside) GIFT to you and the forum readers. I didnot recruit the help of a friend on a Saturday night to attack you personally but to help enrich your (and the forum readers) knowledge. However before you can recieve the value of this GIFT, you must first drop your obvious idea that you all ready know everything there is to know. Now this is an attack on you... If you are not open to additional knowledge for constant learning, then what is it exactly that makes you think that you have the competant knowledge to teach others ??? HAVE A NICE DAY.

Well slanders and slams will not break my bones.
You are only digging you hole deeper.
I do not see any proof of what you are trying to tell us.
B12 is ony tied to fuel pump power to tell the the pcm the fuel pump is getting power.
A 94 C-1500 5.7 has no crash sense built int it to turn off fuel pump.
The oil pressure switch is no way tied to pcm to shut off fuel pump.
It is not a saftey switch to kill engine only a aid to help fuel pump keep running in case of a fuel pump relay fail.
Low oil pressure can not turn off fuel pump if the fuel pump relay is working right.

[CalifOkie]

Originally Posted by MT-2500

Well slanders and slams will not break my bones.
You are only digging you hole deeper.
I do not see any proof of what you are trying to tell us.
B12 is ony tied to fuel pump power to tell the the pcm the fuel pump is getting power.
A 94 C-1500 5.7 has no crash sense built int it to turn off fuel pump.
The oil pressure switch is no way tied to pcm to shut off fuel pump.
It is not a saftey switch to kill engine only a aid to help fuel pump keep running in case of a fuel pump relay fail.
Low oil pressure can not turn off fuel pump if the fuel pump relay is working right.

Okay... I'll except that, now look closer at that diagram and see if you can explain to me why GM would labeled ECM pin# B12 as "Oil Pressure Input"?
How more straight forward can it be ? Didn't you say , "in no way does any wire from the oil pressure switch go to the ECM" ? Let me trace it again for you Circuit 120( gray wire) from pin C of the OP switch. it goes to splice # S149 , to the fuel pump fuse and through it to splice # S127, where it branches off to ECM pin # B12 that is even labeled as "Oil Pressure Input".. How can you argue with that ??

[williambjoe]

well fellas, thanks for the small arrows of direction. they did indeed help point the right direction. i eventually quit getting any power to the fuel pump, or lets say it wasn't pumping anything. so i started to dorp the tank, to check the fuel pump closer. well to my supprise the power wire comming from the FP RELAY/ ECM was almost cut in half. the houseing was the only thing holding it together i would assume that the wire occasionaly seperate the internal wire just enough to stop power then after vibration quit would lay back together. anyway i would chalk it up to MULTI-SYMPTOMS/ INTERMITTENT ISSUES with the starter, battery, generator, a/c compressor and accumulator, and a partial seperation of a fuel pump wire.
i guess a rock or something bounced between the tank and the bed?
anyway in all my short 18-20 years of being a mechanic i have never had something like all of these things happen all at once, or in such a manner. but it is fixed and running like a champ. well except for the tail pipe hanging, and the a/c still needing to be vacumed. by the way you two were very ammusing to listen to. thanks again, you two really shouldn't ever have any hard feeling tward eachother.
later
billy

[CalifOkie]

Good job Billy,
and in all honesty give some credit to MT. He did say check for 12V at the fuel pump... Should of led you straight to it. Good job to both of you.

No hard feelings MT.. I started a new thread about the OP switch usage issue ... I really think I need more opinions on the matter. Of course your input would not only be welcomed it will also be appreciated. Let there be no doubt that I appreciate the work you are doing in this forum. Please join me on the other thread so we can finish this as a FRIENDLY debate. I know I'm right and you know you're right... Let us continue until we reach an agreement.