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Home » Public Forums » GMCnet » [GMCnet] I give up. (Onan)
Re: [GMCnet] I give up. (Onan) [message #188177 is a reply to message #188171] Thu, 25 October 2012 07:26 Go to previous messageGo to previous message
Robin Hood is currently offline  Robin Hood   United States
Messages: 1078
Registered: April 2011
Karma:
Senior Member
Why would the pump slow all the way to a stop? I mean, is there some
sort of sensor or logic in there that somehow lets the pump know "Hey,
the bowl is full and the float is blocking any more fuel coming in,
you can stop trying so hard now, okay?"

I've been operating under the impression that fuel pumps run at all
times, and that it's up to the floats in the carbs to control how much
of that fuel actually goes into the carbs.

For sure it's connected properly, and it works: I even unhooked the
pump from the carb and hooked up power and watched it pee fuel onto my
garage floor.

I can hold the carb up to my mouth and blow into the fuel inlet with
the float hanging down. If I lift up on the float, simulating it
floating in a bowl full of sweet sweet gasoline, it blocks off
something and I can't blow through it anymore.

It's behaving as if, the float is stuck in the "up" blocked position,
preventing fuel from entering the carb at all. I don't think the bowl
is interfering with the float, and the float certainly seems to move
up and down freely.

I'm going to put some more gas in my fuel can, to make absolutely sure
that the end of my fuel line is drawing fuel instead of air. Then i'll
take the carb off again and see if the bowl fills, and if not, see if
taking the bowl off changes anything; that will tell me I've got
something going on with my float.

There was no seepage around the unclamped hose that I just stuck onto
the carb fuel inlet, and there was no fuel coming out of the carb.

I'll play with it some more when i get home.

On 10/25/12, Mike Miller <m000035@gmail.com> wrote:
>
>
> Robin Hood wrote on Wed, 24 October 2012 18:44
>> Further Onan follies! Now with video!
>>
>> http://www.youtube.com/watch?v=my9qBM7ZkDU
>>
>> Shouldn't my bowl be full of fuel?
>
>
> If working correctly, the pump should pump (it is) until the float bowl is
> filled and the needle valve shuts off the flow. the pump should then slow
> to a stop.
>
> As it is pumping but not every stopping without gas pouring out of the
> carb... I'd say the pump is not pumping.
>
> Is it connected correctly? (in/out and 12v/ground.)
>
> I THINK some kinds of pumps with pump a bit when powered backwards....
>
> OBTW: You forgot to put the clamp back on the upper connection of the
> pressurized fuel line at the carb... but did not get even seepage. (Also
> points to fuel pump not pumping.)
>
>
>
>
> --
> Mike Miller -- Hillsboro, OR -- on the Black list
> (#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23'
> Birchaven Side Bath
> http://m000035.blogspot.com
> _______________________________________________
> GMCnet mailing list
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>


--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
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