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

Pump problem?

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  #11  
Old 08-29-2014, 05:02 PM
4x4manonbroke's Avatar
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the pick up coulds be cracked in the tank .. thats the norm ... can un bolt the bed and pull the bed easily with 3 guys help .. its not too terribly heavy ...
 
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Old 08-29-2014, 05:53 PM
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Originally Posted by 4x4manonbroke
the pick up coulds be cracked in the tank .. thats the norm ... can un bolt the bed and pull the bed easily with 3 guys help .. its not too terribly heavy ...
Thanks for the help and yea I got the bed off I had to replace the fuel sensor on the sending unit. Do you think I got a clogged fuel line or a dirty fuel filter?
 
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Old 08-29-2014, 08:11 PM
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Could you pressurize (5-15psi) the gas tank with regulator & shop towl. Then search for leaks.
Mine was the fuel heater electrical connection. Sometimes it is a rubber line others report gasket failure.
There are two gaskets just to mount lp to block. Get a hole in one... air in
Just my $.02
Keep us posted.
DD
Also, my primer bubble cracked allowing for air intrusion. Resulting in another no start scenario.
 

Last edited by Diesel Duo; 08-29-2014 at 08:15 PM. Reason: primer
  #14  
Old 08-29-2014, 08:27 PM
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what is your fuel pressure idleing? on a mechanical gauge it will bounce between 15 and 35 and build to pver 35 reving it up in park. install a clear hose after the fuel heater so you can start the truck and inspect for air bubbles while the truck is running.

if it is just stalling i suspect air.

run the truck from a bucket of fuel straight off the back of the lift pump. if this fixes the problem its sucking air from the lift pump back if it doesnt its not sucking air.

i would also disconnect the shut down soilnoid and wire the lever up. the electro magnets can bleed off if you will and stall the truck out sometimes. eliminate that
 
  #15  
Old 08-29-2014, 09:45 PM
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Originally Posted by Brokencummins
Thanks for the help and yea I got the bed off I had to replace the fuel sensor on the sending unit. Do you think I got a clogged fuel line or a dirty fuel filter?
MAy have not go the pick up on all the way or possibly it cracked while you were putting back to gether ..


I agree with turbo .. try running the LP off of a fuel can and see if that fixes the issue .. if so .. go back to the tank and re do the lines ..
 
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