Onan 2500 KVD problems
New to me 2009 Lance 845 with an Onan RV QG 2500LP generator with 40 hours total run time starts very hard and runs rough. It also appears to have an engine oil leak. When we looked at this unit the o...
Forum Discussion
Yes, I have the factory service and parts manuals for this unit. I have read about the problems with the demand regulator vent hose plugging by searching on this site, and this generator is new enough that it has the foam filter on the end of the vent hose. Because it has the filter, I did not check the hose for an obstruction.
The parts that I think are most likely to cause this sort of problem are the demand regulator mounted on the unit and the carb, but the service manual says these two items rarely cause trouble. Here is what the service manual says about these two components.
Demand Regulator
The demand regulator assembly supplies fuel to the
carburetor. It is usually not the cause of fuel system
problems. All other possible causes should be
checked out before adjusting or replacing the demand
regulator assembly. Figure 8-24 illustrates
the regulator with priming solenoid used prior to
Spec L on Model KV or Spec B on Model KVD. The
demand regulator on later models does not have a
priming solenoid.
LPG Carburetor (Begin Spec E, Model KV
and Spec A, Model KVD)
See Figure 8-27. An LPG carburetor is not likely to
cause problems and should be replaced only after
all other causes have been eliminated (see Section
6. Troubleshooting). It is not necessary to adjust fuel
mixture. These carburetors are calibrated at the factory
and the adjustments are sealed.
The LP pressure reading I mentioned was a static reading as I did not have the correct fittings to tee it in so I could check pressure while the generator was running, I plan on getting the correct fittings to tee it in today and then I can see at what pressure the engine smooths out when I turn the tank valve towards shut off.
Thanks!
The parts that I think are most likely to cause this sort of problem are the demand regulator mounted on the unit and the carb, but the service manual says these two items rarely cause trouble. Here is what the service manual says about these two components.
Demand Regulator
The demand regulator assembly supplies fuel to the
carburetor. It is usually not the cause of fuel system
problems. All other possible causes should be
checked out before adjusting or replacing the demand
regulator assembly. Figure 8-24 illustrates
the regulator with priming solenoid used prior to
Spec L on Model KV or Spec B on Model KVD. The
demand regulator on later models does not have a
priming solenoid.
LPG Carburetor (Begin Spec E, Model KV
and Spec A, Model KVD)
See Figure 8-27. An LPG carburetor is not likely to
cause problems and should be replaced only after
all other causes have been eliminated (see Section
6. Troubleshooting). It is not necessary to adjust fuel
mixture. These carburetors are calibrated at the factory
and the adjustments are sealed.
The LP pressure reading I mentioned was a static reading as I did not have the correct fittings to tee it in so I could check pressure while the generator was running, I plan on getting the correct fittings to tee it in today and then I can see at what pressure the engine smooths out when I turn the tank valve towards shut off.
Thanks!
