The Best M35A2 Fuel Density Compensator Bypass Instruction Video You Will Ever Watch!!!

This video covers installation instructions for the Big Mike's Motor Pool fuel density compensator bypass kit and a general guide to bypassing your FDC.
Buy the kit here
www.bigmikesmo...
For questions and general tech info, feel free to contact us at [e-mail].

[@TylerBurgess3]

Was looking bypassing the FDC on that injection pump you sold me a couple weeks ago. I got quite the shock when I clicked on this video. I pictured you as a 70yo Vietnam vet when we talked on the phone for some reason 😂

[@bigmikesmotorpool9263]

Hahaha na, I just have the knowledge of an old man because I probably started working on junk when I was 3 🤣🤣🤣🤣

[@Jay172967]

What started out as an oil change turned into needing gaskets replaced and now Im gonna have to do this too. Sorry to not order everything in one go, but love the video man. Im hopeful this bypass will fix my problem. Yours is the first site i go to when looking for stuff.

[@bigmikesmotorpool9263]

Thanks, I appreciate the support!! No worries on the orders, we will ship you a single screw or a pallet full of parts any time you like.

[@dieselwrench3621]

I really wish you would post videos more often, this was great info. I wanted to see a follow up of the m35 pulling the camper down the road. 👍🇺🇸

[@bigmikesmotorpool9263]

Thanks, I would love to do more videos, but unfortunately time is not my friend. What all would you like to see in a camper vid? Next time I plan on moving it I can try to get some footage.

[@dieselwrench3621]

@@bigmikesmotorpool9263 some footage of it taking off with the camper and some drive bys would be awesome. Anything M35A2 is great, but don’t get me wrong all your videos are good stuff. 👍🇺🇸

[@darylfraser7353]

Hi Mike, thanks for all your help with my deuce resto! Keep those parts coming.

[@wreckclues]

Great video been buying parts for my 5 ton from you for a couple years and its good to place a face with a name.

[@dw7094]

With over 35 years working with the LD/LDT 465 and LDS 475 engines I never encountered an FDC fault. Any multifuel problem encountered was due to incorrect mixtures, or the use of AVGAS. The data plates on the dash are quite specific.

[@BrineBoy88]

Awesome - thanks for this ! Looks like mine was bypassed while still in service. Thanks for the details so I can know what I’m looking at

[@richstory278]

Great video Big Mike. Im going to get a m35 some day. Hope you make more videos.

[@majmikecalnan]

A very useful video. Thanks Big Mike!

[@ultimatumparagon]

Watched the video ordered my kit , thanks Mike

[@bigmikesmotorpool9263]

Thanks Dann!!

[@X-Appeal]

Thanks for the great video Mike!!!

[@austinaubinoe]

Was wondering why you don't like waste oil. Personally I screen it going into a 275 Gallon oil tank, and then pump it out through a diesel filter. Then run it about 50-50 with diesel. I really just do it because I think that's one of the coolest things about these engines.

[@bigmikesmotorpool9263]

The problem with waste oil I have is if it is black, it is still full of contamination. The black is carbon, which is abrasive. All of that in microscopic form is passing thru the hydraulic head. Most folks think that running it thru a series of filters is clean, but if you watch some centrifuge videos here on youtube you will see how dirty the waste oil really is. It comes out of the centrifuge almost looking new, and the best part is watching the centrifuge cleanout videos. You will see all the junk that has been removed that ends up running thru the hydraulic head. The pumps used on these trucks are not really military specific, they were off the shelf units with slight tweaks for military use. Basically they are just a tractor pump that was chosen due to availability at the time and a density compensator was added. Not really a specifically designed unit to be running other fuels thru, but they made it work. If parts were plentiful maybe my outlook would be different, but they are getting very scarce and are not cheap. Many of the items in the pump are no longer even available from American Bosch, things as simple as a seal in the boost pump and many others.

[@tacticalrepair]

Neat

[@sgt-ho3bd]

Hi I have a M35 A2 I'm wanting to change out the secondary fuel filters for a Twist on adapters my question is if I switch to the new twist ons do I still need to use both filters or can I modify to use only one if so how can I do that if not then I will keep it with the two filters thanks

[@bigmikesmotorpool9263]

If using the original filter head with a spin on adapter, then you would need both. I imagine that if you did something completely custom and removed the original filter mounting head, you could probably find a single filter that might be able to do the job.

[@sgt-ho3bd]

Thank you so much I may have questions later

[@bigmikesmotorpool9263]

@@sgt-ho3bd No problem, glad to help. Feel free to email me your questions to [e-mail]. Easier than doing it thru YT.

[@markpelagio690]

What is the benefit of bypassing the lines?

[@bigmikesmotorpool9263]

The compensator is one of the most common parts of the pump that will cause fuel to mix in with the engine oil. It was so troublesome that many trucks were bypassed by the government while they were still in service.

[@markpelagio690]

@@bigmikesmotorpool9263 it is advisable to do bypass even though my truck carrying heavy load? It doesnt affect the performance?

[@bigmikesmotorpool9263]

For sure. The compensator is only used for maximizing the efficiency of alternative fuels for using fuel other than diesel in an emergency situation, for instance, with it bypassed, if you run gasoline it will not run very well. It will not have any effect on performance of the truck carrying larger loads while using diesel fuel.

[@wipatriot510]

Mine was "bypassed" when I got it, has the "sticker" right on the oil filter...I WAS going to re-enable it, but after watching this, I'm thinkin' not so much...

[@bigmikesmotorpool9263]

Unless you are planning on using alot of gasoline, I would not re connect. There might be something other than gas that these run bad on, but for sure you will know it if you put gas in a bypassed truck, as they just have no power. Oils seem to run in them the same or better than usual when bypassed. I really think gasoline was the only reason for the compensator, back when this was a concept, diesel was not as mainstream as it has been in the last 30 years.

[@wipatriot510]

@@bigmikesmotorpool9263 Yeah, gasoline wasn't on my list of things to run it, even as a last resort, it's really not better than nothing... "waste" oil heavily sifted and filtered, kerosene, on road diesel, off-road diesel... As far as the "waste" oil goes, It'd be a 25%/75% diesel mix at the most...