Cummins Onan LP 25 won't start...
Hi all. I'd like to get some help with a 7-year-old Cummins Onan LP generator that won't start. I've tried to do as much as I can before potentially wasting your time on a problem that I overlooked....
Forum Discussion
Update: I passed the info along too soon -- sorry.
What I said was correct, but the generator still will not start and run on its own. If you give it a good shot of starting fluid it starts but only runs momentarily, until the starting fluid is gone. I have eleven inches of water ahead of the fuel solenoid valve, eleven inches coming out of the valve, but only 7-8 inches at the inlet of the LP regulator -- that's curious because even though I can't see all the hose, I think it's just one uninterrupted segment that connects the solenoid valve and the LPR -- and nothing getting through the LPR. I can't account for the pressure drop.
While I can't detect a vacuum on the LP mixer fuel input or throttle body, I can feel the intake stroke at the spark plug hole and it's enough to operate the vacuum switch for the choke control.
It appears that the LPR diaphragm is doing its job of reducing the tension on the inlet valve but there isn't enough input pressure to overcome the remaining spring tension to open the inlet and allow fuel through. "It appears..."
I'm at a loss here. Is there something else between the fuel solenoid and where I see the hose connecting to the LPR inlet? Is it likely that the hose is leaking enough to account for the 3-4 inches of pressure drop? There are no bubbles around either connection and there is no sound of flowing gas or much of the smell of propane.
Tomorrow I'm going to use another hose to connect directly between the solenoid and the LPR but really, I'm just grasping at straws here.
Any insights or ideas? Thanks in advance.
What I said was correct, but the generator still will not start and run on its own. If you give it a good shot of starting fluid it starts but only runs momentarily, until the starting fluid is gone. I have eleven inches of water ahead of the fuel solenoid valve, eleven inches coming out of the valve, but only 7-8 inches at the inlet of the LP regulator -- that's curious because even though I can't see all the hose, I think it's just one uninterrupted segment that connects the solenoid valve and the LPR -- and nothing getting through the LPR. I can't account for the pressure drop.
While I can't detect a vacuum on the LP mixer fuel input or throttle body, I can feel the intake stroke at the spark plug hole and it's enough to operate the vacuum switch for the choke control.
It appears that the LPR diaphragm is doing its job of reducing the tension on the inlet valve but there isn't enough input pressure to overcome the remaining spring tension to open the inlet and allow fuel through. "It appears..."
I'm at a loss here. Is there something else between the fuel solenoid and where I see the hose connecting to the LPR inlet? Is it likely that the hose is leaking enough to account for the 3-4 inches of pressure drop? There are no bubbles around either connection and there is no sound of flowing gas or much of the smell of propane.
Tomorrow I'm going to use another hose to connect directly between the solenoid and the LPR but really, I'm just grasping at straws here.
Any insights or ideas? Thanks in advance.
