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

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Old Dec 29, 2011 | 12:02 PM
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Default Need Fuel

I have a 96 that im not getting any fuel to the engine with. checked it by cracking the line over the injector and then over the pump. was told its either the solenoid, a fuse, or the pump inside the tank. i was wondering how you would check to see if the solenoid is working or not? any help is much appreciated
 
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Old Dec 29, 2011 | 07:03 PM
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when you turn the key to start engine, this is when the solenoid engages, bump the starter an leave key on an go pull up an see if solenoid is up or not.
as far as pump in tank, no, lift pump is on the block
 
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Old Dec 30, 2011 | 04:00 AM
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what exactly is it im looking for to pop up on the pump, i was told the solenoid is on the back side of the pump but what should be the difference from key off to on after bumping the starter?
 
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Old Jan 8, 2012 | 05:13 PM
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The reason you have to bump the engine over is because the solenoid is a two stage setup, stage 1 activates the strong magnetic field to open the fuel valve, stage 1 is only powered while in "cranking" or "starting" position, stage 2 is a lower field designed to hold the valve open while in "run" mode. If you don't crank first,and just turn on the key, stage 1 is not used therefore the solenoid is not opened for stage 2 to hold it.

To test stage 1&2: Crank engine over,without shutting off ignition, check that solenoid plunger is up

To test stage 2 only: Turn on ignition,without cranking, lift solenoid plunger by hand, if it stays up stage 2 is working

The solenoid is located on back of pump on the side away from engine, find the 3 wire plug above the rear of pump follow it to the solenoid
 
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Old Jan 9, 2012 | 12:35 PM
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it is easily visable. prolly 1.5 to 2 inch around and about 2 inches long, when viewed from the top. it has a rod coming out of the bottom of it which is connected to the linkage they are talking about. you pull this linkage up (or check that it is up). there is a little blue wire that goes to the driver side battery + wire. it corrodes often. if it is you will have a no start problem.
 

Last edited by turbo2332; Jan 9, 2012 at 12:48 PM.
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Old Jan 9, 2012 | 08:23 PM
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checked to see if the rod would push up when key is turned and it wouldn't budge. wasn't coming up either when trying to start. is the solenoid locked or is something else holding it from moving at all? thanks for all the help!!
 
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Old Jan 9, 2012 | 08:29 PM
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disconect the cylonoid from the arm. then manually hold the lever up whule a buddy attempts to start the truck. see if she goes.
 
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Old Jan 9, 2012 | 09:29 PM
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Originally Posted by turbo2332
disconect the cylonoid from the arm. then manually hold the lever up whule a buddy attempts to start the truck. see if she goes.
If you just take the solenoid off it will start. No need to hold it up.

Sent from my DROID BIONIC using Tapatalk
 
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Old Jan 9, 2012 | 10:42 PM
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Thanks for the input, me and a buddy were actually talkin about trying that. We'll see how she goes. Thanks again!
 
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Old Jan 10, 2012 | 10:37 PM
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So any news
 
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