Re: [AMC-List] carb rebuidl help

[Tom Jennings <tomj@xxxxxxx>]

On Wed, 13 Dec 2006, Matt Haas wrote:

> I would check the fuel pressure before you do anything else.

Yeah, that wouldn't hurt -- a perfect carb will do all those
bad thins if the fuel pressure si too high.

Bu tif it is a stock pump that's unlikely; the internal spring
determines pressure, and they get weaker with age, not stronger!


> 
> Matt
> 
> Ken Siroonian wrote:
> > thanks tom and froank for your comments, i bought another carb kit and
> > will give it another go. I thought I cleaned the last one very well,
> > just can not figure why it overloads with gas. The fuel pump is the
> > original with the car, and i did not know it could over pump in the
> > carb. maybe I shoudl just change it. anyway, the float was new too and
> > is buoyant and not absorbing fuel. the filter is new. you can not test
> > the needle and seat with the carb with the top off as the needle seat
> > and float are attached to the top with a small pin. the choke opens
> > fine and even when I hold it fully open, the car runs like dog meat,
> > and the the tpipe blows lots of black soot. I can even see some fuel
> > that comes out the bottom of the carb. onto the base area.
> > any more ideas please let me know, i will work on these, regards, ken.
> > 
> > On December 12, 2006 Tom Jennings wrote:
> > 
> >> On Mon, 11 Dec 2006, Ken Siroonian wrote:
> >>
> >>> wondering if anyone has a tip on rebuidling a 1 BBL YF CARB FOR A
> > 76
> >>> PACER. I rebuilt it about 6 months ago due to engine flooding,
> >>> overloading with fuel, black soot out of the exhaust, engine oil
> > was
> >>> getting black fast and oil level higher due to the fuel. I rebuilt
> > it
> >>> with a new float the black fiber float- just in case. the old one
> > I
> >>> tested was fine anyway. now it is doing the same thing, albeit it
> > has
> >>> not been driven more than a few hundred miles in all that time.
> > she
> >>> uses it rarely, and the choke is coming off ok, but it just won't
> > run
> >>> right with all that fuel and the belches of black soot/smoke. any
> > ideas
> >>> what I may or may not be doing right. are the adjustments that
> >>> critical, I am following the amc spec book as well as the carb
> > rebuild
> >>> sheet, and the float level does not seem high or out of whack. I
> > have
> >>> not pulled the carb off the car yet, just the top. is there an
> >>> adjustment I can make on the car and try again before i rebuild it. 
> > the
> >>> needle and seat looked ok, though I have only done these a few
> > times. i
> >>> adjusted the idle screw ok as well. does that affect more than just 
> > the
> >>> park idle. any ideas will be apreciated. regards.
> >> Hmm... you have a stock fuel pump? Not an aftermarket or
> >> electric pump?
> >>
> >> And a good clean new quality fuel filter, plumbed before
> >> the carb?
> >>
> >> The choke is off or disconnected, for testing? Turn it 4 -
> >> 6 or more notches LEAN, the choke plate should be open. It
> >> would be unpleasant to drive it that way in cold weather,
> >> but it will help for testing.
> >>
> >> As a test, with the choke fully open, your foot OFF the throttle,
> >> cranking the engine, the carb should stay DRY. It probably
> >> won't start, but the carb should NOT get wet inside. If it
> >> does, you have somethin wrong in the carb, float stuck, sunk,
> >> dirt in the needle and seat, etc.
> >>
> >>
> >> Some crude but simple diagnostic tests:
> >>
> >> With car OFF! carb assembled and on car. Put clean hose on the
> >> carb fuel inlet, blow into it. If the car was cranked previously,
> >> the bowl should be full of gas and the needle and seat should
> >> be CLOSED. You should NOT be able to blow into it. If you can,
> >> or you hear even seeping of your breath into the carb, 3 -
> >> 4 psi of fuel will definitely push in there, flooding it.
> >>
> >> You can even more crudely test the needle and seat by taking the
> >> top off the carb, leaving the needle, set, float attached. Blow
> >> into the fuel inlet; with the top right side up, air should
> >> flow. Turn it upside down, it should stop. If it doesn't do that,
> >> fix it.
> > 
> > 
> > =============================================================
> > Posted by wixList Archiver -- http://www.amxfiles.com/wixlist
> > 
> > _______________________________________________
> > AMC-List mailing list
> > AMC-List@xxxxxxxxxxxx
> > http://www.amc-list.com/mailman/listinfo/amc-list
> > 
> > or go to http://www.amc-list.com
> > 
> > 
> > 
> 
> 
_______________________________________________
AMC-List mailing list
AMC-List@xxxxxxxxxxxx
http://www.amc-list.com/mailman/listinfo/amc-list

or go to http://www.amc-list.com