12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Where did my power go?

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  #1  
Old 02-03-2011, 03:50 PM
godblessmud's Avatar
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Default Where did my power go?

Yesterday my 94 12v lost all power while sitting at a stop sign. I had to limp it the rest of the way to my buddies house and then all the way home again. I had filled up the day before at a new gas station because of their 20c off discount so my first thought was that **** in the tanks had clogged up my fuel filter. So i changed that and the problem actually seemed to get worse cause today I cant even drive it over 25mph without going downhill..

Symptoms:
NO smoke except on startup
No power
Fuel pedal is really hard to push
When I disengage the clucth and take the load off the motor idle drops to 2-300 then pops back up to only 500 rpms

It just flat out feels like its starving for fuel but I already changed the filter Im wondering if the fuel shutoff solenoid didnt get tripped somehow and how do I check that?

Any ideas?
 
  #2  
Old 02-03-2011, 07:01 PM
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suck tube could be clogged.... ip or lp may be bad. i would check fuel pressure at the ip first
 
  #3  
Old 02-03-2011, 09:19 PM
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maybe an inter cooler boot blew out
 
  #4  
Old 02-03-2011, 09:32 PM
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So it is dark and raining tonight I cant see much but I did notice that the metal canister that bolts onto the AFC housing has broken out the bolt hole on the back side of the AFC. I beleive that canister is a fuel regulator of some kind but correct me if im wrong...
 
  #5  
Old 02-04-2011, 09:12 AM
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pics of this?
 
  #6  
Old 02-04-2011, 07:11 PM
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that is your problem. you are getting no boost to your afc meaning no rack travel= not much fuel to your injectors!
 
  #7  
Old 02-08-2011, 03:46 AM
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Okay guys I found the problem, it was the emergency fuel shutoff! Upon closer inspection it had ripped out the bolt holes on the AFC housing and fallen over and because it is a gravity fed system cut off almost all my fuel. A few helicoils and grinding a new bracket later she runs better than ever.
 
  #8  
Old 02-08-2011, 05:28 PM
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fuel shut off rod may have came down mine did that and everytime i started it i had to get out and push up the rod and she was good till i turned it off
 
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