fuel problems - monster dark 750 2002 -

[muzz]

hi i just had to fix the tank,, drained  it,, fixed it, but when trying to start it seems like there is issue with the feed to the carbs,,

do i need to jumpstart the fuel pump??

it is a monster dark 750 2002- exterior pump....

[Monster750ie]

In 2002 750 monsters were injected. You sure its carbed.

If it really is carbed the pump is vacume operated. Is the petcock open?

[Howie]

Do you hear the pump prime when you turn the key on?

[muzz]

no i suspect the pump ,, but what is the issue,, it was running,, then i remooved the tank,, then replaced it,, so what can happen meanwhile,, could it be the relay??

Petcock?? is that even an option...

please guide me on this

Bowl in carb is dry

[He Man]

firstly you need to make sure whats on youre bike.

If its injected, the pump should be internal and is electric
if its carbed (if its an 02 it doenst have a carb unless it was modded) then youre pump is external and is vaccum operated.

the bowls in your carb cant be dry if you dont have carbs.


you need to give us more information to work with you. Does the bike turnover when you hit the starter?  and as howie stated did you hear the pump prime when you turn the key on?

[muzz]

it is a monster Dark city 2001 or 02 it is registred in germany 2002
it has external vacum pump,,
carburators have a bowl thank you and they are dry,,
i have followed the tube/hose from tank and all the way to the pump under the carbs,, ( i have not torn it apart yet,, so from the tank to the filter to the first pump to the vacum pump
there is flow,, but i have not checked at the other end of the pump...

i just ca not believe that this fails just by being in the garage for 1 month

i wonder about 1 thing,, does the fuel level sensor affect the feed of fuel ?? it is not connected...

The story is:
the bike was thrown down from the kickstand,, resulting the hinge welded to the tank caused a leak,,, the person trying to raise it somehow ( how i have no clue) grabbed the wires leading from the fuel level sensor and tore them apart by doing so,,
now i had the hinge torched, and the tank coated,, the whole process took aprox 1 month...

now it is assembled and only thing different is the actual fuel level sensor is not connected.....

i have no logical explanation,, but i poured fuel directly to cyl. and it started , i was hoping it would motivate the vacum pump....

but .... do i really need to  tear it apart....

or does anyone hawe knoledge how this can stop working

Thank you all

[ducpainter]

It could be the vacuum petcock has stuck shut. It is mounted under the bracket where the tank hinge bolts.

It can be bypassed.

[Howie]

It could be the vacuum petcock has stuck shut. It is mounted under the bracket where the tank hinge bolts.

It can be bypassed.

First place I would look.  If it is faulty replace it with a manual petcock.

[He Man]

The main thing to check is fuel flow. and vacuum. So that would be the petcock, fuel filter and then the pump in that order.
just pull the vacuum hose on it and well...suck on it like a straw, you should feel/hear the check valve move.

[muzz]

thanks every body
i thought about the suck idea,, but do i suck the fuel line or

[ducpainter]

thanks every body
i thought about the suck idea,, but do i suck the fuel line or

try sucking on the vacuum line to the petcock. It will connect to an intake runner. If the vacuum petcock works, fuel should flow to the pump.

Personally, I'd replace the vacuum petcock with a manual unit because it will eventually fail. It may not be the issue this time, however, so you still need to diagnose it.

[muzz]

thank you

[The Mad King Pepe']

 - unplug the fuel line that goes into the carbs and place it inside a bottle (a can, a glass)
- let it pour out all the fuel inside it
- leave the fuel line in the bottle, switch the bike on and push the starter button for a few seconds

if fuel come out of the tube then the carburettors are your problem

if no fuel comes out then unplug the line that goes in your fuel pump and repeat for everything that does not work until you get to the tank.


hope this helps.