P pump not working after reinstall - Dodge Cummins Diesel Forum
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post #1 of 35 (permalink) Old 05-15-2019, 03:51 PM Thread Starter
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P pump not working after reinstall

Hello,

Put the P pump back on the truck after a bunch of engine work and it is not pumping. Torqued the nut to 170 foot pounds, installed a new air dog which is supplying adequate fuel to the pump. Also I removed one delivery valve and turned on the air dog and fuel shot out of it like a fountain. But for whatever reason when I put the delivery valve back in and tighten it down fuel will not shoot out of the barrel into the injection line when turning the engine over.

This is day three of pissing around with this, if anyone has any tips I would really appreciate it. Shut off solenoid is working, and just to confirm I removed it and pull the lever up with zip ties. Still nothing. When I push the shut off solenoid down I can feel some springy resistance so I don’t think the rack is stuck.

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post #2 of 35 (permalink) Old 05-15-2019, 03:58 PM
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If you loosen the nut on the top of the injectors and turn it over does fuel come out?


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post #3 of 35 (permalink) Old 05-15-2019, 04:12 PM Thread Starter
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After about 30 ten second attempts with the starter there was a bit of wetness but when I tightened them again it wouldn’t start
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post #4 of 35 (permalink) Old 05-15-2019, 04:16 PM
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P pump not working after reinstall-img_3286.jpg

You have not assembled the DVs upside down, correct?


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post #5 of 35 (permalink) Old 05-15-2019, 04:19 PM Thread Starter
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Correct, I just put in new ones. And confirmed twice with power driven diesel that the big side goes down and the pin goes in the top
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post #6 of 35 (permalink) Old 05-15-2019, 04:23 PM Thread Starter
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Also, I just pulled the fuel filler out and took a video and it definitely is turning the injection pump Gear.

Thanks for your help btw
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post #7 of 35 (permalink) Old 05-15-2019, 04:24 PM Thread Starter
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I mean oil filler
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post #8 of 35 (permalink) Old 05-15-2019, 04:36 PM
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What are you using for an Overflow Valve? Do you have a quick way to see how much is flowing from the return?


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post #9 of 35 (permalink) Old 05-15-2019, 04:40 PM Thread Starter
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If you are referring to the return line from the top passenger side front end of the P pump, I have installed a rubber line onto the hard line which then t’s into the injector return line and then heads back to the tank. I have tried disconnecting the hardline from the P pump and turning the key forward which then shoots Fuel out like a fountain. I have also disconnected it from where it tees into the injector return line and the line going back to the tank and lots of fuel shooting out there also.
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post #10 of 35 (permalink) Old 05-15-2019, 05:13 PM
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What valve are you using in that fitting? It is a banjo fitting how are you using a rubber line? Maybe I misunderstood


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post #11 of 35 (permalink) Old 05-15-2019, 05:24 PM Thread Starter
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Finally started getting good fuel flow at the injectors. Haven’t been able to start it yet but at least it’s coughing a bit like it wants to. I guess it must’ve just been an air bubble from hell I have no idea how it took this long to come out.
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post #12 of 35 (permalink) Old 05-15-2019, 05:30 PM Thread Starter
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Thanks for your help, much appreciated
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