Lift pump?

[xtreem3d]

Hi Guys,
I have an LX 985 that will now only idle. If it idles @ 960 and I rev it up it takes about 1-2 minutes to get to about 1300, then if I try to move the boom the rpms drop off fast. Fuel filter is new, electric pump is pumping, pickup not clogged because I blew through it. Machine has been sitting nearly empty on fuel. I added 5 gallons and it only brought it up to 2 bars on gauge so it was really low. I also cracked the injectors to verify fuel was getting up there. Any Ideas besides lift pump? There are 2 electric connections by lift pump , one is the shut off and the other I don't know what it does because diagram on Messicks site wouldn't appear.
Thanks,
Steve

 

[Mike10]

If you are getting a good supply of fuel to the injection pump, then I would suspect something is stuck in the injection pump. If it sat a long time it is possible something has either rusted up or gummed up in the injection pump.

 

[xtreem3d]

If you are getting a good supply of fuel to the injection pump, then I would suspect something is stuck in the injection pump. If it sat a long time it is possible something has either rusted up or gummed up in the injection pump.

Hi Mike,
I sort of suspected the same . If so...would something like a diesel fuel injector cleaner poured in fuel tank be a possible fix or do you think something will have to come apart?
Steve

 

[Mike10]

Hi Mike,
I sort of suspected the same . If so...would something like a diesel fuel injector cleaner poured in fuel tank be a possible fix or do you think something will have to come apart?
Steve

You don't have anything to lose

 

[frogfarmer]

The pumps on these motors are simple and would have to be very bad for it to be stuck and stay stuck. I would suspect the shut off is partially operating or the fuel supply is restricted. Does the machine smoke under any of the conditions? Does it start easily? Does it have a good battery? Check the voltage at the shut-off to verify you dont have a bad connection somewhere. Honestly if diesel fuel wont free it up no amount of snake oil is going to cure it.