Carter YH Issues

[axj7145]

I had a turbo failure last year on my 62...cracked the hot side housing. I sourced a rebuilt turbo that also had a carb on it. After putting this rebuilt turbo back on the car I did get it to fire up, but was flooding out if you weren't constantly in to the throttle. After it sat, it was dripping gas right out of the mouth of the carb pretty good. The carb was also rebuilt. I am unsure of how long the carb sat rebuilt on a shelf though. I removed the carb, took it apart enough to check the float drop and the other adjustments. The needle tip felt good and squishy still so I put it back together and gave it another try. It's still just pouring gas out of the mouth. Am I wrong to think I have a needle and seat issue? Or should I start somewhere else? I'm trying to keep it simple here, but thought I'd ask the pros on this site. The manual is better than nothing, but little information on the Turbo engine.

I do not have a return line on this from the filter as this is a very early 62 turbo. When I had the fuel line unhooked from removing the carb I just had a rubber cap on it while I had it out. When I went to stick the carb back in and hook the line back up it was shooting gas out of the line like I had an air hose in the tank. Can it push fuel past the pump just from pressure in the tank?

I apologize for the long message here. Just super frustrated with this and want to get it back on the road.

[Phil Dally]

No need to apologize for giving us enough information to actually help you...usually it's quite the opposite.

[Lane66Monza]

You .might have an unvented cap on the gas tank. Take it off and see what happens. Get a vented cap if it solves the problem.

[jfreez]

what fuel pump are you using? stock?
I wonder what your fuel pressure is since you don't have a return.

[66vairguy]

Many years ago Steve Goodman at Rear Engine Specialists in Colorado helped our club with a 62 Spyder. His advice was excellent. For some reason his site is down at the moment.

The YH was revised numerous times and mismatched parts area a problem. Also the YH prefers 2 - 3 PSI. It is assumed the return line via the filter was a pressure regulator, but it is not. Basically a way to prevent vapor lock. A precision fuel pressure regulator is suggested.

Steve has a good reputation for rebuilding the YH carburetor and turbo units. Worth the money to have him sort it out.

[Frank DuVal]

A few suggestions:

Can it push fuel past the pump just from pressure in the tank?

Yes! If you have a non-vented gas cap or a newer vented gas cap that will not releive pressure in the tank, it just vents air IN, not out. Worthless in hot weather.

Am I wrong to think I have a needle and seat issue?

Yes, you are possibly wrong in another way. The Carter YF and YH have the accelerator pump in the bottom of the float bowl and when the diaphragm gets a hole/split fuel flows into the throat of the carburetor making a very rich mixture.

And your fuel pump may be putting out too many psi. Only 2ish psi is good on a YH. 3+ is trouble.

[joelsplace]

All good stuff to check. Gas cap, fuel pressure, accelerator pump diaphragm. If fuel shot out gas cap is for sure wrong. Clark's sells the wrong one or at least used to.
One other thing to check is the tang on the float needs to be parallel to the needle tip. If it isn't it will put a side load on the needle and it won't shut off. The fix is to stack gaskets under the needle seat. If you have wondered why all kits (or at least used to) come with multiple needle seat gaskets and sometimes different thickness gaskets now you know.
My '64 turbo had this issue and an extra gasket fixed it.
I have a forklift that had the float adjusted so far down it hit the bottom of the float bowl and it still leaked. Extra gaskets fixed it.

[Frank DuVal]

I forgot to add, cure for making a gas cap non-vented both ways is to drill a 1/16" or so hole in it. Not while installed...

[66vairguy]

As others said ALL THE NEW VENTED GAS CAPS ARE ONE-WAY. It is not a vendor problem. It's a regulation.

This is what happens when lawyers write regulations WITHOUT consulting with engineers. The idea was to let air in as gasoline is consumed by the engine, but will not let fumes out. Simple, but fuel and air expand (considerably) as things warm up. At night when the fuel and air cool, air is drawn in. The next day as the fuel and air heat up it is trapped by the one-way vent and the pressure goes up.

Some caps you can take apart and remove the one-way "flap". Other you have to drill. Only a 1/32" to 1/16" hole is needed. Smaller the better or fuel will squirt out as the tank sloshes from movement.

One recent solution is to install a charcoal canister vent can. I've seen them advertised recently in car magazines. You hook it to the tank vent (or return line on fuel neck in Corvair) and use a sealed gas cap. Air in and out of the canister and NO fuel stink in garage.

[Frank DuVal]

YEP!

Gasoline expands quite a bit on temperature rise, as one sees when they fill their tank to the top in the cool morning than drive to a show a few miles away..... Hey, why is that car leaking fuel? Happened to me in a winter show, topped off the tank, drove to an indoor show (inside the service department of a dealership) where it was heated to over 70 °F inside, and had to sop up fuel.

Gasoline quantity is regulated to be measured at something like 68° F. Change the temperature of the fuel and the volume changes too. So if the cap will not let the vapors out, the psi at the carb rises a lot! Park up hill and hydrolock is a real issue.

[joelsplace]

I wasn't trying to criticize anyone but now that you mention it - it is absolutely a vendor issue. Commies may have changed regulations but if a vendor is selling the bad caps they should warn people instead of acting like it is the correct cap.

[Lane66Monza]

Clark's is selling a cap that fits the Corvair and meets government regulations. They are between a rock and a hard spot in regards to these caps and the Corvairs owners. The more we keep bringing up not to buy the caps or to modify them once you do, the less issues.

But I don't see the word constantly getting to all the new owners, since they don't join clubs or the Vair Forums. Never will find this info in all those FB pages. So the problems will continue until the last Corvair is parked and dismantled.

[66vairguy]

I wasn't trying to criticize anyone but now that you mention it - it is absolutely a vendor issue. Commies may have changed regulations but if a vendor is selling the bad caps they should warn people instead of acting like it is the correct cap.

Oh sure you want to criticize someone -

Commies --- such silly talk.

[American Mel]

Speaking of criticizing people, . . . . . .

[66vairguy]

Speaking of criticizing people, . . . . . .

That comment from you is laughable ---

[joelsplace]

Mel just pointed out a fact. Your statement was hypocritical. I wasn't criticizing anyone until you brought it up but yes, if you sell a part that you know isn't going to work properly for the application you are selling it for you deserve criticism and I'm glad to point it out. More people should and maybe it would pressure the offenders to change their ways.
And people that want to take away other's rights for the "common" good sure sounds like commies to me.