Hello,
My 2005 Monster 620 didn't start up the other morning, it went through its cycle and tried to crank up but never started. After some research, I tried again and did not hear the fuel pump come on when I turned the key but did here a relay pick up.

I then disconnected and reconnected the fuel pump and a few other connectors. I still had the same problem.

I then Disconnected the fuel pump and verified I had voltage on the start up sequence, I banged on the fuel pump with a few light taps of my wrench also. My bike started up after that idled for about 15 minutes, then I drove her about a half mile and the fuel cut out.

So I am going to replace the fuel pump and see if that cures the issue. Does anyone know if "CNT Intank EFI Fuel Pump Ducati Monster S2R800, 695 (2007-2008), 620 (2005-2006)" on amazon is a reliable pump?
If not should I go with the one on monsterparts.com "FP-DUC"?

Any advice in additional trouble shooting is welcome as well.

Have you checked the fuel pump relay or the fuses in general?

First thing to do . . . You can have voltage while key is ON butm, if you hit RUN and nothing happens, something is happening and not necessary is the pump gone bad

I disconnects the pump at the last electrical connector to the pump.  When I hit the start button I receive voltage at the connector for the duration the bike tries to start.  When I turn the key on I receive voltage for the first few seconds.  I dont see any fuses or relays after the last connector to the pump (it seems like it is just a pigtail).

The fuel pumps are generally quite reliable.

Cheapest and easiest is to first replace the fuse.
I've seen a couple of fuses that pass visual and multimeter checks, but will intermittently fail to provide juice.

The relay that supplies the fuel pump (and other stuff too) is the most likely culprit.
These can fail intermittently too.

Next to that, the wiring pass-thru assembly is the next least-reliable.
Intermittent failure is common.
Replacement unit is available from Ducati.
Some folks will repair themselves, but I don't go down that road on customer bikes.

Ok well I will start with the fuse first.  Thank You

I had the same issue on my monster 695. It turned out that the fuel pump wasnt the problem. It was the wiring that the fuel pump connector plugs into. Call Desmoto in San Francisco. They had a replacement part for me that is improved over the original Ducati part

Anyone in particular I should talk to?  Do you remember what the part is called?  Thankyou all for the help thus far.

So I swapped out the main fuse and the 30 amp injection fuse, and put in 2 new relays.  Didn't help.  I have wiggled wires and it didn't seem to help or hurt.  The bike did start up when I got home before I touched anything but died after idling for about 45 seconds. Not sure how to post pictures but I took some of the connector for the fuel pump with the boot peeled back.  Does anyone know what resistance reading you should get across the terminals.  As far as those wires being bad does anyone have a part number?

How to post pics,  http://www.ducatimonsterforum.org/index.php?topic=109.0


So, still the same with new and swapped relays and fuse . . . Well, now, we diagnose electrics !!!

Go here, and download your owner's manual, the electrical layout of the bike is there . . .

If there is current going to the pump and the pump works when powered directly,

Quote from: Speeddog on August 22, 2016, 12:15:01 PM
The fuel pumps are generally quite reliable.

<Snip>

Next to that, the wiring pass-thru assembly is the next least-reliable.
Intermittent failure is common.
Replacement unit is available from Ducati.
Some folks will repair themselves, but I don't go down that road on customer bikes.

This would be a DIY project.  Search this board, others have done it.

I am going to drain the fuel tank and take out the assembly, and test the fuel pump directly.  It seems like it is probably the wiring that goes through the epoxy, but maybe Ill  luck out and the internal fuel filter is just really gummed up.  Thanks for all the help.  I'll post back on this thread with updates on what i find.  Thanks Agian.

I drained the tank and pulled the fuel assembly. I put a used fuel assembly that was running when pulled in.  It's late so I can't get gas until tomorrow. I checked the pump motor on the assembly I pulled and it checked good.  I then verified continuity between the fuel asmbly motors and found a varying open from 20 ohms to 2k ohms.  I will put some gas in her tomorrow and see what happens.  I also have a new filter and wiring harness to repair the old assembly.  Fingers crossed she will be running tomorrow.  (I did verify continuity checks on the pump I installed)

Does anyone know the name of the tool to remove the stock clamps from the fuel filter ends, or have any advice how to get them off?  I have new screw clamps with the new filter.

Thank You

Are they the reusable snap type, or the one time crimp type.

One time...



Reusable...

They are the crimp type, I just found a youtube video showing to cut the center with wire cutters and that releases the tension.  Thanks for the quick response .