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  #1  
Old 03-30-2014, 03:34 PM
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Fuel system diagram

Anyone have a diagram of how the fuel system flows on the OBS trucks? I've got a 96 here and someone has hacked on the fuel lines and I'm not sure that they are right. I have no fuel getting to the bowl so I wanna make sure the lines are right and if they are then I'll move to the pump. Thanks guys.
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Old 03-31-2014, 05:55 PM
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Anyone?
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Old 03-31-2014, 06:56 PM
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Not sure if this is what you were looking for. Quality isn't great. Cheers!
Attached Files
File Type: pdf Fuel Sys.pdf (38.3 KB, 71 views)
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Old 04-01-2014, 04:51 PM
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According to the diagram it comes from the tank and then runs through the pump and then to the filter. Do you check for fuel pressure at the schrader valve on the side of the filter housing? Do you have to have a special fitting to test pressure like the 6.0's? Sorry for the questions but I'm more of a 6.0 guy.
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Old 04-01-2014, 05:20 PM
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Basically, It runs from the tank to the pump (1st stage, low pressure), to the filter, back to the pump (2nd stage, high pressure), out of the pump to the rear of the heads and into the fuel rails. Then out the front of the heads to the fuel pressure regulator (FPR) attached to the bowl, and back to the tank. Yes, you do measure the pressure at the Schrader valve on the FPR. If you have the correct fitting, you can screw on a 0-100 psi liquid-filled gauge (glycerin dampens the pulsations for better reading) onto the valve or like many folks do, just use a rag and a tire pressure gauge. You could also remove the Schrader fitting and use a 1/8 NPT fitting, but be very careful to not overtighten and crack the regulator housing! You should get a minimum of 25 psi at 100 rpm crank speed. At idle you should have at least 40 psi. Cheers!
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  #6  
Old 04-01-2014, 05:42 PM
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I'm gonna check it tomorrow if it's not raining. I'm almost positive the pump is junk. I really appreciate the help.
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Old 04-05-2014, 03:34 PM
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Well, finally got a chance to put a fun pressure gauge on it. Doesn't even move the gauge. Pressed the valve core in while my wife cranked the engine over and it barely pushes the fuel out. I'm gonna say the pump is junk.
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Old 04-08-2014, 12:04 PM
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I got the fuel pump replaced and I'm now getting fuel fuel to the fuel bowl but this thing still won't fire. I have AE but for some reason I can't get it to read anything. It shows all the PIDS available but won't show any info on the graphs. If I shoot a little starting fluid in the intake (I know, I know) it acts like it wants to hit. Any info in the direction to go is appreciated. Truck has a new fuel pump, new OE HPOP and new IPR valve.
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  #9  
Old 04-28-2014, 05:26 AM
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Got it figured out. Swapped PCM's with a known good one with no change. Swapped in a different IDM and she finally started. Runs great for having sat for almost 2 years. Thanks to Jugernaut (Dale) for the help and to Twinjracing for the use of the IDM.
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  #10  
Old 04-28-2014, 05:53 AM
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Glad to hear you got it figured out
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