Recent Posts

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Technical Support / Re: Onan generator 7500

« Last post by David T. Richelderfer on Today at 02:56:11 AM »

Yes, you could have an air leak allowing air to get sucked into the fuel flow.  How long has it been since you filled the diesel tank?  If a long time, then you could have water or algae in the fuel tank, or got filled with a bad load of fuel, in which case your fuel filter could be plugged... even after you recently changed the filter.  Remember, the generator pulls its fuel from the very bottom of the tank.  Have you driven the coach recently at highway speeds up any hills, and if so, did the engine run properly?

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Technical Support / Re: air up suspension from air compressor

« Last post by Lee Welbanks on April 22, 2024, 11:51:35 PM »

My 06 PT has air connections near the right side of the generator, one is a drain the other is a quick connect to air up the whole coach, there is also one in the engine bay left side frame rail, it only airs up part of the system.
Also have a quick connection driver side first basement above the fuel tank.

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Technical Support / Re: Onan generator 7500

« Last post by Eric Maclean on April 22, 2024, 11:38:18 PM »

Randy
I believe Richard is right  on .
To verify you can do as Richard suggested to check the supply line.
You can also use the fuel can trick to eliminate the fuel supply line altogether to see if that is where your problem is.

Eric

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Technical Support / Re: Onan generator 7500

« Last post by Richard Davis on April 22, 2024, 10:59:17 PM »

It really seems like you are getting air in your fuel.  I would carefully check the supply and return fuel lines for any issues. The only way I found the issues in my fuel lines on my QD8000 was to disconnect them, pressurize them with air and spray the lines with soapy water.  Boy, did I create bubbles, the supply line was sucking air, but not showing leaks.  Replacing both lines made it run much better. 
Good luck.  Richard
p.s. If you have not replaced the fuel filter, do that also.

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Technical Support / Re: air up suspension from air compressor

« Last post by Joel Ashley on April 22, 2024, 10:43:57 PM »

Seems like some coaches can also have the quick connect and tank drain valves in with the front generator.  Makes more sense there, for tow truck situations, than ours in the battery bay;  the tow truck driver has to string a long hose from his truck, over our passenger mirror, across the side of the Coach, and “tie it off” in or around the battery bay.  Go figure.

Joel

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Technical Support / Re: Replace Domectic Air Conditioner

« Last post by Lawlor Wakem on April 22, 2024, 05:00:41 PM »

Thank you.

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Technical Support / Re: Onan generator 7500

« Last post by Randy Keaveny on April 22, 2024, 04:07:02 PM »

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

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Technical Support / Re: air up suspension from air compressor

« Last post by Eric Maclean on April 22, 2024, 12:56:18 PM »

Dan
Your service bay should have a quick coupler near the tank drain valves you can connect an air line there and air up the whole coach .
This is the connection a towing company will use to maintain air on the system in order to air up the suspension and have air to release the parking brake so they can tow it.

Once you have the suspension aired up you will want to drain the tanks ( the air suspension should stay up ) the air line from the dryer to the wet tank will be pressurized until the wet tank is drained.
Check the supply line fitting on the braided supply line before you get in too deep they have a habit of getting very rusty requiring replacement of the line other than that it should be a straight forward replacement.

If the quick coupler is not in the rear service bay ( passenger  side rear) try in the electrical bay ( driver's side side front) some of the Beaver coaches had it there.

Eric

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Technical Support / Re: air up suspension from air compressor

« Last post by Joel Ashley on April 22, 2024, 08:45:33 AM »

Our rig has been stored for some years, parked off-level and dumped for good rain runoff.  When I needed to level/lift it up a couple summers back for more room to work underneath without starting the engine, I used my small 2 gallon Makita portable compressor and connected to the coach’s auxiliary air quick-connect.  It refilled the long-empty air tanks allowing use of the HWH control pad.

Joel

10

Technical Support / air up suspension from air compressor

« Last post by Dan Johnson on April 22, 2024, 12:20:07 AM »

I am putting a new air dryer on due to being old and rusted up.  Can I tee into the in line from the compressor so I can air up the suspension before starting the motor?  Or would the air go backward through the engine air compressor?