CTD shaking/vibrating... DV's?

Discussion in 'P Pump' started by Montgomery Farms, Jan 25, 2012.

  1. ramhunter9

    ramhunter9 Supporting Member

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    And to think I have Raptor lift pump just sitting here ..LOL

    Austin .. dam kid I am going to need your SS number so I can claim you on my taxes as a dependent .
     
  2. rambob

    rambob Senior Member

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    haha, nice.
     
  3. ramhunter9

    ramhunter9 Supporting Member

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    Shit I had to feed the kid the other night .. poor little guy
     
  4. Montgomery Farms

    Montgomery Farms Member

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    Whatever!!! I went to Casey's! You
    Made me drive over there when your wife coulda brought me something! Haha

    Anyways, I read that your not even supposed to shift into 5th until 50MPH... I don't know... I guess it's time to invest in a fuel pressure gauge...
     
  5. Montgomery Farms

    Montgomery Farms Member

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    """""The surging in the engine is caused by the small factory DV's in the 160 pumps, At light loads and low rpm the stock dv's can't give enough fuel to keep the larger injector open through the full cycle. Atleast this is how I have had it explained to me. I replaced mine with .022 and the surging stopped.""""" -Mr.Diesel

    Just found this... I think this at least part of my problem, if not all of it. But it is time to get my fuel press. guage. This would explain why it does it in low RPM's AND at light loads. Like I said how if I get more into the pedal it powers through it.
     
  6. Uncle Ugly

    Uncle Ugly Senior Member

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    True....Depending on the mileage it would be very benefecial to make a change in the OFV.

    ACtually this is not correct..The factory lift pump will support plenty of power.However,if the fuel system is compromised by air leaks(which is a very common problem) the factory lift pump will struggle to maintain even at low power levels.I have personally seen factory pumps run into the 800hp range.

    IMO what you have is a fuel system that is allowing air into it somewhere that is causing a lean condition down low and when the RPM's rise the motor can overcome it.The injectors you installed are not large enough to cause this problem at all.I would start by pulling the rubber boot off the lift pump plunger and unplug the fuel heater wiring.IF you find that either are wet/damp with fuel they are allowing air into the fuel system which will be one problem.

    The next place to look is the return line that runs behind the P7100 and off of the OFV.Follow the hard line and you will find a small section of rubber hose that gets hard and cracks and causes air leaks also.

    Another place to look in the engine bay is where the factory fuel lines cross the bell housing.Mopar uses a line that is a braided outside/plastic lined center which are notorious for leaks as the plastic gets old.

    Next place to look for leaks is by following the fuel lines along the frame rails.As the trucks get older the steel lines fail as they rust and will begin to weep or show wet spots.Also try and look on top of the fuel tank basket as you will also find that the hoses there will fail with age and leak or possibly break off a barb fitting and it will leak.

    Until you troiuble shoot the fuel system I would not look elsewhere.DV's can cause what your experiencing BUT usually when the have issues the truck will miss from the bottom to the top and not smooth out.I have also seen what you experiencing due to dirty fuel filter and/or pre-filter screen(pre-filter is located down on the lift pump assembly).

    Let me know how you make out and I hope this helps.I spent HOURS redoing the fuel system on my old 12v and have seen many guys miss one little leak and it killed them for power..........Andy

    P.S.-Also make sure you have no wet injector lines at their mounting points and the small brass washer hoops on the return lines are not leaking.
     
  7. Rogan68

    Rogan68 Senior Member

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    I have, as well. My stock OE lift pump on the 12V supplies more than enough fuel for my 400+hp.
    I forgot all about that. I had to fix a ton of small leaks on the 12V.. The one most hidden, or hardest for me to find was where the steel hardline on the framerail connects to the braided line over the bell housing. The retainer clip inside the lower-most end of the braided line was rusted to pieces (which is odd, as the rest of the hose was SS) and barely retaining the fuel line connection. It would suck air in there, and cause some crazy bucking.
     

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