Multifuel no more?

Hey guys. I just had a guy look at my engine on my M35 I bought from GL in Aug. He told me that the truck is no longer a Multifuel. He told me the Army had changed it to just diesel. He said that is best. I don't think so. I really liked the idea of a multifuel.

What are your thoughts? Is it a big or expensive deal to convert it back to multifuel. The guy looked at (I'm guessing) the fuel pump and told me something was disconnected and now it was only diesel. Thanks for your thoghts.

Well, technically, it's still a multifuel. The Fuel Density Compensator (FDC) has been bypassed.

Do a search and you'll find a few threads about it.

It was probably bypassed becuase it was leaking (as they seem to tend to do).

I lot of times they are bypassed when they are overhauled. To prevent them from leaking. It's not a big deal to put it back. Just some hose and a couple of fittings. Cranetruck has posted the pick of how it's plumbed. You'll have to reset the fuel rate when done. But that's easy also. Shouldn't take more than a hour to do the job.

Thanks guys. Is setting the fuel rate tough to do? I do not have any special equipment.

Where does it leak and can I prevent it before it gets started? I really like the multifuel aspect incase I really need to get somewhere or from something. I guess the guestion is is it worth the trouble? and where do I get the parts? Thanks.

Worth it? I think so. I mix used motor oil in mine, it really helps on the fuel costs.
They leak under the base. and the only way to know it's leaking is you'll find diesel in the crankcase. I don't think the leaks are real common. I got mine 9 years ago and it's leak free. None of the ones i've worked on a the fire dept have leaked eather.

Thanks Ken. Where do I get the parts to turn it back into a multifuel or are they still on there do you think? I would think that if I check the crankcase oil on a regular basis I could detect a leak fairly soon.

Is a leak expensive to repair, etc? Thanks for your help.

At the end of this link is a Picture of the bypass that would have been performed on your truck if the FDC has been bypassed (diesel only). It also shows the multifuel setup. it's as easy as this to reconnect for multifuel useage. http://www.steelsoldiers.com/index....t=0&postdays=0&postorder=asc&highlight=bypass

Thanks Eric! I am totaly confused but at least I have a place to start... I think. I know you most likely have no idea but do you think all the parts are still there and it is just a matter of re-connecting everything or do i need to get some parts? I can take pictures if that helps anyone. Thanks.

ken said:

Worth it? I think so. I mix used motor oil in mine, it really helps on the fuel costs.
They leak under the base. and the only way to know it's leaking is you'll find diesel in the crankcase. I don't think the leaks are real common. I got mine 9 years ago and it's leak free. None of the ones i've worked on a the fire dept have leaked eather.

Click to expand...

Ken, were the fuel; costs less because of a large volume of used motor oil you were burning, or because the motor oil somehow had more BTU's in it?

It should just require re-routing the fuel lines ( no parts needed ).Look at your truck and figure out which picture in the post matches your fuel lines on the IP. If you have two loops (circles) in your fuel lines, you have been converted to diesel only. Figure 1, is what the fuel lines look like if your FDC has been bypassed. Figure 2, shows where the lines were before converting (multi fuel configuration).