General Boards > Technical Support

Onan generator 7500

(1/2) > >>

Randy Keaveny:
Hi all. Back at  the motorhome working on genset.  Showing a code of 3 flashes. But will not start. It fires.  Like it wants to.  But will not grab.      Plenty of fuel.  Is there a shutoff accessible.      Or way to get to injectors.     The rapid flashes for pre heat  glow plugs is working.   And I can hold button down to hear it prime.   Any help ???

David T. Richelderfer:
Our generator is a different model but I believe the fault codes are very similar for all their models.  I found the following.  It indicates you should be able to get a second-level fault code which would more precisely define the generator's issue.

"• Three blinks indicate a service fault. Press Stop once to cause the two-digit, second-level fault code to blink. (Pressing Stop again will stop the blinking.)The two-digit code consists of 1, 2, 3, 4 or 5 blinks, a brief pause, and then 1 to 9 blinks. The first set of blinks represents the tens digit and the second set of blinks represent the units digit of the fault code number. For example, Fault Code No. 36 appears as: blink-blink-blink—pause—blink-blink-blink-blink-blink-blink— long pause—repeat"

Randy Keaveny:
Thx.  I got it to run.  But does not sound right.  As it surges.   Starts up.   Runs.  Takes the load. Then ki da struggles to keep running.  No codes now.  But. Something is still not right.  Internal fuel filter that I cannot see ??   Is what I am wondering now.

Eric Maclean:
Randy
How long has it been since you saw it run properly?

It may still be a fuel issue .you may still have air or a restriction.
The first thing I would do is turn off the breaker/s on the gen set and then let it run for an hour or more to warm it up well and see if it doesn't smooth out then turn the breaker back on and load it with about a 2k watt load to see how it responds.

Eric

Randy Keaveny:
Thanks.  Yes. I thinki will try that.  Let it run its little heart out.  Wondering if I ran somebody fuel thru it when I replaced fuel filter last winter ??   But. Really have to crank on it to get it to start.  Then she purrs.   Takes load.  Runs for about a minute or two.   Starts surging. 
Hmmmm

Navigation

[0] Message Index

[#] Next page