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Re: [GMCnet] Onan Not Starting... [message #166625 is a reply to message #166603]

Tue, 17 April 2012 12:26

mike miller

Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon

Karma:

Senior Member

I am assuming the numbers in the pitcure match the numbers below:
<http://www.gmcmhphotos.com/photos/showphoto.php?photo=43877>

>> 1. New fuel pump.

-- Has it ever ran with this pump? As it is square I assume it is NOT an Onan pump. Is there a filter on the suction side of the pump? These little square pumps are easy to install backwards and do not work that way.

>> 2. End of fuel line. Has the start of some splitting but
>> it looks like it is holding a seal - I'll replace it anyway.

-- Looks dry... as in no fuel. This area should be under pressure when operating correctly. Make sure it seals "really good."

>> 3. Connection into the filter. Holding my finger over this, there is no suction at all when cranking.

-- This is the connection into the carburetor... output of the pump.

>> 4. Choke? What position is full choke, should I be dinking
>> with this when trying to start?

-- The engine is cold and you are trying to start. it should go fully closed when cranking and half closed when not cranking. remember that this engine starts with full-open throttle.

>> 5. Throttle. When I push this, the motor cranks faster but
>> still doesn't catch.

-- As when you push on "this" you are closing the throttle, I do not understand why it would crank faster... Confused

What I would do:

I know many do not like using starting fluid, but I use it to divide, the problem in half. I disconnect the breather hose (between 2 and 3 in your picture) and spray a SMALL amount into the intake side of the carb. Then crank. If the motor fires I know that the "electrical" side is working and move on to the "fuel" side of the problem.

Let us know what you find. (With the dry hose, I suspect you have a problem on the fuel side. look into a small fuel can... something like a outboard motor boat tank would be best.)

Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo' http://m000035.blogspot.com

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[Message index]

		[GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 09:19
		Re: [GMCnet] Onan Not Starting... By: Dennis S on Tue, 17 April 2012 09:25
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 09:31
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 10:05
		Re: [GMCnet] Onan Not Starting... By: Bob de Kruyff on Tue, 17 April 2012 10:28
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 10:32
		Re: [GMCnet] Onan Not Starting... By: Dennis S on Tue, 17 April 2012 10:40
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 11:30
		Re: [GMCnet] Onan Not Starting... By: mickeysss on Tue, 17 April 2012 11:40
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 13:17
		Re: [GMCnet] Onan Not Starting... By: Dennis S on Tue, 17 April 2012 11:41
		Re: [GMCnet] Onan Not Starting... By: Bob de Kruyff on Tue, 17 April 2012 11:46
		Re: [GMCnet] Onan Not Starting... By: William Cornell on Tue, 17 April 2012 13:02
		Re: [GMCnet] Onan Not Starting... By: roy1 on Tue, 17 April 2012 11:54
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 13:14
		Re: [GMCnet] Onan Not Starting... By: Bob de Kruyff on Tue, 17 April 2012 13:26
		Re: [GMCnet] Onan Not Starting... By: mike miller on Tue, 17 April 2012 12:26
		Re: [GMCnet] Onan Not Starting... By: Kudzu on Tue, 17 April 2012 23:43
		Re: [GMCnet] Onan Not Starting... By: Ken Burton on Tue, 17 April 2012 17:36
		Re: [GMCnet] Onan Not Starting... By: Ken Burton on Tue, 17 April 2012 17:38
		Re: [GMCnet] Onan Not Starting - UPDATE... By: Kudzu on Fri, 11 May 2012 17:35
		Re: [GMCnet] Onan Not Starting - UPDATE... By: k2gkk on Fri, 11 May 2012 17:47
		Re: [GMCnet] Onan Not Starting - UPDATE... By: Kudzu on Fri, 11 May 2012 20:02
		Re: [GMCnet] Onan Not Starting - UPDATE... By: C Boyd on Fri, 11 May 2012 19:12
		Re: [GMCnet] Onan Not Starting - UPDATE... By: mike miller on Fri, 11 May 2012 19:52
		Re: [GMCnet] Onan Not Starting - UPDATE... By: Kudzu on Fri, 11 May 2012 20:06
		Re: [GMCnet] Onan Not Starting - UPDATE... By: C Boyd on Fri, 11 May 2012 20:33

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