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Old 08-23-2007, 10:46 PM   #15
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Oswaldo

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Originally Posted by jagcb750
@klattu: I hate to hear you are having these problems too, It sure has been nerve-racking on me. I wish you luck with yours and let us know how it turns out for you.
I ran out of tinkering time for the Onan, had to by a new one.
Kept the old one for playing with later.
Too much depended on it running dependably.

I thought that grassy knoll in you avitar looked familar !

Was looking real hard at your MH last October.
Could not agree on a price with them.
Only one I have seen with those dark guards on rear.
Was it as clean as they said?
What type of roof AC are those?
They work good in this heat ?



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Old 08-24-2007, 06:27 AM   #16
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floats

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Originally Posted by jagcb750
@richinny: my floats are made out of tin like metal.
metal ones can leak too, easier to check as you just have to shake them.

as for the choke, it should be wide open when warm. sometimes carbs need to soak in a carb bath to open up the tiny passages inside. you might try to find a rebuilder that has experience with thse carbs or go new. carbs can be very fustrating (been down that road myself). i hope that spring replacement works out for you.
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Old 08-24-2007, 10:21 AM   #17
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@klattu: hey, you found nancy. It was pretty clean. all original from what I can tell. The hose that feeds the water supply was eat up. the elbow in the back left rear corner that feeds the water supply leaked and had to be replace with a high pressure fitting. The Generator is surging. The 30 amp plug-in had to be replaced. It was shorting together and was getting very hot. The Master cylinder was empty in one chamber and half full in the other. the engine is dieseling on occasion. The roof a/c's are colemans. one of them does not have adequate intake in one side (the front one). I need to take a saw zaw and cut The panel out on the roof on one side. they would work good if I can get the generator running correctly and do a mod in the generator compartment to feed the rear a/c separately with shore power. Oh, the front a/c is weaker than the rear. I believe that I may be able to fix it by letting the door side get a little air in the intake side as stated above.
@richinny: thanks, I hope I can adjust it out. If not I will probably bow down and seek professional help. Thanks to all. I hope to get this problem resolved this weekend If I can get a new spring by then.
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Old 08-24-2007, 11:55 AM   #18
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Sounds like your working on mine...same problems

Carbs on Ebay

eBay Motors: GENUINE ONAN CARBURETOR #146-0802 (item 2482505412 end time Sep-01-07 04:17:45 PDT)
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Old 08-24-2007, 08:26 PM   #19
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@richinny and jim clark: I think you guys are still on the right track.

Let me give everyone another update:
I didn't tear into them this time. After adjusting around on it for a while and figuring out that no matter what I did it was running really rough, I decided to unplug the fuel pump. Straightened right out. It cleared up in just about 5-10 seconds and ran smoothly until it ran out of fuel. Then I plugged it back in and it ran smooth for a while then would load up with fuel and I would unplug the fuel pump and it would straighten back out. One time it ran smooth enough for me to adjust the governor and put a load on it while I was doing it. It started surging again and I would pull the fuel filter plug and it would straighten out again.

It sounds like the needle valve is bad, or the seating surface where the needle valve is wore out, or the floats aren't floating anymore or the fuel pump is too powerful or creating some kind of added pressure. Anybody feel free to chime in here. I wish there was an Onan dealer in town. Anybody know of one online that accepts credit card?
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Old 08-24-2007, 08:47 PM   #20
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Quote:
Originally Posted by jagcb750
@richinny and jim clark: I think you guys are still on the right track.

Let me give everyone another update:
I didn't tear into them this time. After adjusting around on it for a while and figuring out that no matter what I did it was running really rough, I decided to unplug the fuel pump. Straightened right out. It cleared up in just about 5-10 seconds and ran smoothly until it ran out of fuel. Then I plugged it back in and it ran smooth for a while then would load up with fuel and I would unplug the fuel pump and it would straighten back out. One time it ran smooth enough for me to adjust the governor and put a load on it while I was doing it. It started surging again and I would pull the fuel filter plug and it would straighten out again.

It sounds like the needle valve is bad, or the seating surface where the needle valve is wore out, or the floats aren't floating anymore or the fuel pump is too powerful or creating some kind of added pressure. Anybody feel free to chime in here. I wish there was an Onan dealer in town. Anybody know of one online that accepts credit card?
It sure sounds to me like the fuel pump is over coming the float/needle valve causing the motor to flood from excess fuel. After you shut the pump off the bowl starts emptying and you're running good for a brief period. I'd say replace the float and needle valve and you just might have your problem licked.

Good luck!

Brad
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Old 08-28-2007, 12:07 PM   #21
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update: I called Cummins yesterday and checked on three kits for my carb. a needle valve and seat kit, an idle mixture kit, the main fuel adjust kit a spring etc. I was going to replace all. He stated 2 of three part numbers that I gave him were showing obsolete in the computer. He stated there wasn't a considerable price difference if I was to just buy the whole carberator. So that is what I did.
The carb arrived today. Talk about fast. I will install the new carb this evening and see if I am in Fat City. I will repost with the results as I find out. Wish me luck.....
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Old 08-28-2007, 12:21 PM   #22
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Quote:
Originally Posted by bkahler
It sure sounds to me like the fuel pump is over coming the float/needle valve causing the motor to flood from excess fuel. After you shut the pump off the bowl starts emptying and you're running good for a brief period. I'd say replace the float and needle valve and you just might have your problem licked.

Good luck!

Brad
Or the fuel pump has a bad switch; the pump shuts down on a backpressure switch. If the switch has stuck closed it will just keep pumping away. Electric fuel pumps come in different pressure rating someone could of installed the wrong one. You can get a replacement from any good auto parts store, they are on a wall rack and the mounts are universal.

Since you are unplugging the pump I suspect a bad switch on the pump and not the needle valve. Trying blowing in the fuel line feeding the carburetor and see if it lifts the needle valve. Could be either one, you need a fuel pressure gauge on discharge side of the pump to see at what pressure the pumps shuts down. You could also block the line and see if the pump keeps pumping indicating a stuck switch in the pump.
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Old 08-28-2007, 12:41 PM   #23
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@Jim Clark: OMG Jim, I hope that installing the new carb will do it, because I have bought it already. But if I have to buy a new fuel pump and or switch it won't be the end of the world. I will put on the new carb and if it doesn't fix it I will start looking at the fuel pump and or switch. Oh the pump is stock it still has the stock Onan paint on it.
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Old 08-28-2007, 03:04 PM   #24
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Just as a point the switch is internal to the fuel pump, which is why it is hard to check.
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Old 08-28-2007, 10:19 PM   #25
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Update: Well I put the new carb on and Success!! No more surging. Well, almost. I Tweaked it out as per the manual and it took the load really well. It hunts right at first and then smooths out, but I believe that is what it is supposed to do isn't it? I had both a/c units going and the fridge and everything was good and smooth. but when I turned on all the lights and one little t.v. it started surging. It runs as smooth as can be on 1 a/c. and the fridge. It can handle the second a/c as long as I don't turn all the lights on. I was wondering if I was just putting too much of a load on it with everything on? Anyway, I think it is running well now.
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Old 09-10-2007, 08:15 AM   #26
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Quote:
Originally Posted by jagcb750
Update: Well I put the new carb on and Success!! No more surging. Well, almost. I Tweaked it out as per the manual and it took the load really well. It hunts right at first and then smooths out, but I believe that is what it is supposed to do isn't it? I had both a/c units going and the fridge and everything was good and smooth. but when I turned on all the lights and one little t.v. it started surging. It runs as smooth as can be on 1 a/c. and the fridge. It can handle the second a/c as long as I don't turn all the lights on. I was wondering if I was just putting too much of a load on it with everything on? Anyway, I think it is running well now.
Get out the pencil and do a load study buy recording the demand of each item. I would bet someone you know has a clip on amp probe; normally anyone who works ac has one. Borrow or buy one and clip it on the output feed of the generator and record the load as you turn on items and it will tell you if you are getting full output from the genset. If not you many need to tweak the unit some more.
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