Hi, I found this thread from 2016 since I have the same problem with my 12kw MDJF.
I am a layman (read: have no idea what to do, or-better-: completely new to this matter) and read about an electric pump replacing the old one. Is any one from you readers able to explain to me what to do (pls step by step) the moment I have purchased a set like @lepke mentioned in this thread? Or is there a vdo on YT I should watch to see this process?
If I remember correctly, on those units you have a lifter pump assembly that has a fuel bowl on the left (as you look right at it from the side of the motor) and the lifter on the right. On the left side, before the bowl is where the supply /hose/ comes in. More toward the right, closer to the fuel pump proper and the pump lever is another line that runs to the fuel filters. That one may be a hard line, but I remember it also as a hose.
The easiest thing to do may be to splice the electric fuel pump into the hose close to where it enters the fuel pump assembly by that bowl. It is okay to add more hose if you need to do that to get a couple or small few more feet to be able to secure the pump well.
The basic idea is that you want it close to the motor so you can do the electircal wiring and so that it is pulling more than pushing, and you want tyo splice it into the supply line. so that it is pulling fuel from the tank and pushing it into the old pump and filters, etc.
...but, please let others chime in, in case I have details wrong. Memory is fallible.
You could also remove the existing pump and plate over it. And, that is the right way of doing it. But, it can get more involved. I've seen plenty of people leave them unless and until they cause a problem, and I get defer removal until then.
...you may want to standby for other opinions on this. Others may feel leaving the old pump in is the wrong thing to do.
Others have already discussed the wiring.
What I want to add about the pump is to make sure you get one rated for /continuous/ vs /intermittent/ use (and, of course, rated for diesel). A lot of pumps that look like they'd be right, but are way less expensive than they should be, if you look, are only rated for intermittent use, e.g. for transferring while stored, or priming, etc, vs continuous use, e.g. to supply as long as the unit needs to run, indefinitely.
