Fuel Button Install on 855 Cummins PT pump

[@r.a.4475]

At last, a video showing the mysterious "button" I keep seeing everyone talking about. Thanks!

[@bertgrau9246]

I've done that a bunch of times on the truck if your careful you won't lose parts. I took out a #30. And put In a #7 plus I stretched out the governor spring. When I finished blow smoke every gear change, no load engine RPM 2450. Fuel mileage went from 5.8 to 6.25 running at 62-65 MPH when coming to a hill ease fuel pedal to floor many times topped hills I would had to down shift once, never had to after the easy tune up . Better throttle response and fuel mileage great combination Oh, at 62-65 MPH RPM was around 1700 RPM

[@213eddy]

Did you mean 7 or 27 because I want to order that same button you did I have down shift as I go up a hill and would like to roll coal

[@213eddy]

Also what does it mean the higher the number what does it do as opposed to the lower number like a double 0

[@stevenowen4150]

Blowing black smoke means ya over fuelling the motor, how could you get better fuel milage🤷🏻‍♂️. You have have upped ya fuel pressure considerably changing from a #30 to a #7(didnt know they made a #7🤷🏻‍♂️) Shouldnt change by more than 5 at a time. 30-25, 25-20, 20-15 etc. I hope hour camshaft can handle the extra pressure. And id watch that pyrometer like a hawk. Melted pistons dont do motors much good.

[@matthewjones8620]

I have never taken a pump off to change a button, in your video you turned the pump horizontal (like it would be in the truck) to pull the button out anyway. Literally a 10 minute job on the truck. Thanks for the video's

[@MVPartStore]

Absolutely correct. Just a lot easier to make a video on the bench.

[@smckinney3mckinney141]

greetings, just came across this video and all though this is an old video. I wanted to pass something along. the "button " is actually" for how much fuel gets by-passed back to the tank.and limits how much fuel the pump receives. andyes the #stamped on the button relates to the size of the hole. the actual name is called " the fuel by-pass disc" enjoyed the video.

[@jefforylaumer4168]

Ive been in the military 22 years done a ton of years the 30 button is the smallest a zero is the biggest you cant find zeros a five is easily buyable if you know a good machinist they can make a double aught but these military nhc-250 engines have all three the smallest three power building components upgrading the button will help but the engine is still castrated 855 engines make power in three areas. 1 the fuel pump orifice they vary from 1/4 up to 1 1/4. 2 the button and three the nozzle of the injectors

[@lesschattermoresplatter5769]

“And I’m not even going to play around with these shims” as he preceded to play around with the shims.

[@mcozpda3392]

... I use a loooooong time ago in my KW 350 BC 14 spd .. #18 ... and was great in everything ... special in the mountains with heavy loaded ...... Cheers .

[@arguswil]

mco zpda thank you !

[@kevinhilderbrand3254]

Now, who removed breakoff bolts with the pump still on the enging?

[@rorschach1911]

We used to call the snap ring the “Jesus clip”, because that was usually the first word out of your mouth when you dropped it in a dark gravel truck stop parking lot trying to swap out buttons and shims lol. Excellent video sir!

[@thomaslockley945]

Does the non AFC have a idle adjustment screw n same spot 🪛

[@9700caboverPhilippines]

Hi good day. I have a question. Can you dissasemble a pt pump and dont let a calibrator calibrate the pump? Implaning to change the front oil seal. And dont want to go to the calibrator shop

[@MrSehka77]

So did you notice any difference once you swap out the button ? Which one did your truck have and which button did you install ?

[@213eddy]

So what does the button do if I get a #40 or #7 what do they

[@RoRo-yp7nj]

If I just want to adjust the idle.. does the fuel stop after taking off that plug? And how do I bleed the system?

[@speedandmarine9066]

There will still be fuel in the lines, heads and injectors. Fire it up and hold the RPM up a little and normally it'll pull enough fuel to self bleed pretty quick. If you have a questionable fuel system you'll have to crank on it a little while. You don't need to pull the entire governor cover to adjust idle, just the plug at the back. Cummins has a special tool to adjust the idle while the engine is running to avoid the adjust/start/bleed/readjust game.

[@jameshickey9393]

@@speedandmarine9066 I think 3/4 turn right increases idle 100rpm, turn left decreases idle 100rpm. Slightly back off after turning 3/4 turn.

[@speedandmarine9066]

@@jameshickey9393 How much the idle screw affects idle RPM depends on a lot of factors. No need to back off after adjusting if you use the correct method. If you don't have the special tool and are pulling the plug to adjust with a normal screw driver you need to run the engine long enough to purge the pump housing and stabilize the idle on a hot engine to see if you need further adjustment

[@justinmartin8887]

What are you reloading for

[@MVPartStore]

I reload 30-06, 5.56, .40, 9mm, and some .30 carbine.

[@Punk-Jw]

There really isnt much info on some of the old stuff like this, glad you put one up. What do you reload? I have a reloading room too. I have dies for 87 different cartridges currently, probably adding another with a 7.5x55. One of only a couple of milsurps I dont have but I'm bidding on both a 96/11 and a k31.

[@aidanalmaraz3135]

I took my pt fuel pump off its off of a 855 350 big cam Cummins when I put it back on the truck start good but after a min the truck start to rev up really high and it won’t come down what could I do to fix it

[@robertschiedeck80]

#20 will wake up that motor I took out a 40 from mine and a 20 made her pull nice

[@sunset5311]

ran a nta 370 with 345 lbs rail ps and a 7 button had to put on a bigger turbo but that keep those 1693 's behind me

[@biglovesam]

Is the governor plunger supposed be removed freely? Mine is completely seized. The coupler was broken and the tee that spins the plunger is sheared off.

[@MVPartStore]

+Samual Krokson Sounds like you may need a new pump. Wish I had a spare to share.

[@biglovesam]

+WoodWorking With ADD I'll tear it down more and try to get it out then I'll have to find parts, spare parts would be great not much on ebay

[@cavecustom9724]

hello, please tell me how to increase the power of my motor and what to substitute in it to get 500 hp . Nta855 315hp

[@acme663ryo]

I would live to know what number you used, where you got it and your opinion about power, MPG and EGTs. Thinking of doing it myself but MPG is more important than HP for me. (edit just saw where you say #20)

[@MVPartStore]

+NelsonStudios I plan to change that to a 12. Currently I buy them on eBay but not that I have my own parts website I'm hoping to make them available as well. My EGT's hover around 900 when cruising on the freeway at 60 to 65. If I encounter a substantial hill and I'm pulling my M989 HEMAT trailer I will hit 1250 and then start to back out of it. I'm not sure about actual horse power gains as this is such a heavy vehicle to begin with. Pittsburgh Power claims the dual fuel line modification alone increases 25 horse. I do believe this is a needed mod with the dual fuel line for the extra volume needed to maintain stock pressures. Some one much smarter than me could explain the hydraulics law of pressure vs volume. On a side note I do believe that you and I need to exchange some contact info as we both seem to gain a lot from each others videos. Plus I think we can help each other out on some of the projects if we were to collaborate. please feel free to email me anytime, or anyone who has questions can. [e-mail]. And be sure to visit the website at www.MVPartStore.com

[@acme663ryo]

I contacted you through the store.

[@OC45573]

+WoodWorking With ADD Did you change to the #12 fuel button yet?

[@MVPartStore]

+OC45573 Not as of yet. The truck will be on the road for the first time since November today if all goes well so it'll be a while yet.

[@MVPartStore]

Not yet. Haven't had much time.

[@markinaliti9468]

thanks so much for the information i will try that on my pump

[@adrian201236]

I really appreciate this Video.... thanks so much

[@grupoebbeke1727]

Hello good day .. consultation . I have a cummins generator with a pump of the type pt . the problem is when they run out of oil ... or makes a service ... take a long par make it take fuel .. where should purge ... loosen sections of the exit nozzle fill the pump drawing ... the alen this up .. etc ... which is not logical or actual method for doing this procedure. Hernan greetings .

[@ragman069]

They sell a special curved wrench to access that rear bolt on the fuel pump

[@colestroud8300]

That wrench is actually for the air compressor. It's not needed on the fuel pump

[@rjhtrucking5429]

what about changing the governor spring for a more stiffer spring.

[@speedandmarine9066]

That's what the shim pack under the retainer is for. Add shims to increase RPM, take shims out to reduce RPM.

[@trentstractor]

Is a PT pump on an L10 the same? My '93 L10 is 280 hp, and I would like to bring it up to maybe 310. I don't want to get too crazy with it. Thanks.

[@MVPartStore]

I honestly can't answer that. I will try to research it and let you know.

[@braydenmalaske8194]

You can hit 310 with it pretty easy. We had one that we cranked up and put bigger injectors in that was about 400 and it didn’t last long so we went back down to about 330

[@adriancunningham6772]

I was told that if I put a number 5 button in my big cam 4 it can burn up my pistons do you know if the change of the button will burn up the piston....

[@MVPartStore]

Run a pyro for sure. You will be adding a lot more fuel which creates heat, the heat is what could burn a piston.

[@adrian201236]

So what button would you recommend for additional power without changing turbo. My big cam is rated at 315hp .. i just need to boost to 375hp or 400hp just to help with the weight. I don't really want to change the governor 75mph is good but my truck struggles a bit on hills...

[@travislee4704]

You can definitely cook the pistons with a 7 a good number is 15 no lower then 12 and dont lug

[@adriancunningham6772]

@@travislee4704I change from a number 25 to a 15 I notice the difference I am planning on lowering to a number 10 what else can I do to increase the power.

[@travislee4704]

@@adriancunningham6772 I wouldnt mash it all the time because a 10 is too much fuel. Wong last 300k miles

[@SheepDog7071]

awesome video,,just what I needed. thanks

[@solomon28612]

Bring us a video that is measuring between big cam crankshaft and Nissan diesel v 10

[@lviscarlofariasareval9297]

With what purpose do I perform this operation so that it serves me

[@robtay351]

more fuel

[@virgilshields4978]

Put a 5 in and back that throttle shaft out about 8 rounds be good to go

[@Mark_Tschetter]

Any estimate how much HP that would add?

[@mohamedabdelmonamalkider2710]

I replaced 3 new pt pump for cummmins KTA50-G3 the generator will be hunting When i swap used pump from another generator no hunting

[@dieselfueled_]

You sound like jeff daniels lol

[@52felix87]

I learned nothing 🤦🏻‍♂️