New Topic - does't run any better this year

[JPSmit]

Try the test I detailed previously in this post. It will tell you for sure whether the problem is with your floats.

I'll try it tomorrow - thanks

 

[JPSmit]

I have no experience with a ZS carb, but is it possible that you have the inlet line hooked to the vent line and the vent line hooked to the inlet?

can't see how - bottom into float - top out to vent

 

[Morris]

Float-left. Vent- right.

 

[JPSmit]

? are we talking the same thing - i'm meaning externally

 

[aeronca65t]

OK, the (brass coloured) hose connection shown in the lower center of the picture is the "in" connection. Correct?

 

[Trevor Jessie]

I think you are correct. I guess it would be hard to mess that up. On some HIF44's it is less obvious.

 

[JPSmit]

nice carb though - wish mine was that pretty.

in your post Morris, were you talking about the pipes in the reservoir?

my question in that regard is this. there are 2 brass pipes in the reservoir - one is the needle (where the gas goes up)

what is the other?

 

[bigjones]

Hey JP, how are you doing?

I just had a brain wave.
Could it be the choke is somehow operating.
Maybe you could somehow disable it next time you test the carb out.

BTW, where exactly is the fuel overflowing from? Out the throat or through the vent line?

Also, next time you are at the auto store, pick up a pressure/vacuum gauge - they are inexpensive. Hook it up to the line from the fuel pump and see what the fuel pressure is like. (Be cautious, as always with gasoline, ie make the connection good and tight)

Keep the faith.

Adrian

 

[JPSmit]

thanks for the thoughts - I'm inclined to discount the choke (which is stupid I know given my track record) only because when I had the carb in the shop, the mechanic installed the choke properly, and even marked the casing for me to make it richer or leaner. also, we are talking flooded now rather than lean/rich. that being said, any suggestion is wonderfully received.

also, the fuel is coming out the throat

 

[aeronca65t]

If fuel is pouring out of throat, it can really only be one of three things:

Float needle valve is stuck or damaged.

Float level is set too high.

Fuel pressure is too high.

 

[JPSmit]

If fuel is pouring out of throat, it can really only be one of three things:

Float needle valve is stuck or damaged.

Float level is set too high.

Fuel pressure is too high.

Or, it could be something that we never thought of like some idiot capping off the vent line (that would have run to the canister) when he rebuilt the carb. BigJones was the closest - thank you thank you a thousand thank yous for making me think of it.

Before I removed everything again, I uncorked the line and it started instantly. I mean instantly!, did I say instantly?

So, never never never ever plug your vent line.

She's fabulous - timing set, idles lovely, smooth as silk, nothing left but reassemble and pray for an early spring.

Once again guys I cannot begin to thank you enough for all the help you have been/ are/ will be. I'd like to say I don't know where I'd be without you - but I do know, and I wouldn't have a paddle.

Thanks again Dave for driving from Tillsonburg, thanks for all your advice.

 

[JPSmit]

Oh and 14.4 volts at the battery at idle with lights on - thanks GM Delco

 

[bthompson]

Hey, JP...I've been puzzling over your problem, taking my own ZS apart to get some brainstorming ideas. What causes flooding thru the jet?...It can be excess fuel pressure pushing past the float valve and up the jet, or a weak valve or soggy float raising the fuel level too high in the bowl. You've already checked those, so we can rule those out. It can be a bad needle. You have a new needle, so it can't be that. It can be a mis-set needle. Does the shoulder of the needle set proud of the brass needle holder, and does the brass bit sit proud of the piston? Are the vent holes in the bottom of the piston facing the engine side of the jet?That brings us to vacuum problems. A plugged charcoal canister can put more pressure in the reservoir relative to the jet, pushing the fuel out...but you're not running your charcoal canister, so no worries there.A piston that's not raising up high enough (or at all) due to a vacuum leak will make the venturi small and fast, which will suck more gas out of the jet.The second brass tube in the reservoir you asked about vents to the choke disc, which has another vent that comes out just behind the butterfly. I'm guessing the choke works by venting that high-pressure area down to the reservoir, essentially pushing fuel out the jet.

What I would try, is making a blank gasket for the choke disc, taking it out of the circuit in case air is leaking through it. That should prevent the possibility of atmospheric pressure pushing fuel up the jet; making the venturi work harder to suck the gas out.

oops...I see you've already got it. good show!

 

[aeronca65t]

Or, it could be something that we never thought of like some idiot capping off the vent line......

Excellent! Congrats!

By the way, plugging the vent line causes high fuel pressure. :wink:

 

[Morris]

Woooooooooo Hooooooooo!

 

[14dna]

JP;
I never thought of that.
Boy, color my face RED!!!!!!!!!!

I'm really glad it works now.

Anything else, just call

Dave

P.S. That is one of the nicest Midgets I've ever seen!!!!

 

[bigjones]

Good for you, JP. I'm really pleased for you.
No surrender!