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Rampy Floods While Parked
Posted by: RKF ()
Date: June 25, 2020 05:27PM

Recently, my Rampside has refused to start after setting for 15 - 20 minutes. I can usually start a flooded engine by holding the gas pedal to the floor while cranking. But today, after spending 20 minutes in the grocery, the truck refused to fire. I waited another ten minutes and it finally started. Once it fired, I had to continue cranking the engine until the excess fuel was burned out of the cylinders, which is typical of a flooded engine.

My question is: Is this likely due to a bad needle valve, improper float adjustment, or something else?

I should add that, aside from the flooding problem, the engine runs and idles great.

Knoxville TN

1962 Corvair Rampside
1963 Corvair Spyder Convertible (project)
1966 Corvair Monza Convertible

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Re: Rampy Floods While Parked
Posted by: American Mel ()
Date: June 25, 2020 05:34PM

Are you SURE it was Flooded, and not Vapor Locked?
How high was the temperatures today in Knoxville?

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Re: Rampy Floods While Parked
Posted by: RKF ()
Date: June 25, 2020 05:37PM

Vapor lock is a possibility, although I do run an electric fuel pump. Temperatures today were in the low eighties.

Knoxville TN

1962 Corvair Rampside
1963 Corvair Spyder Convertible (project)
1966 Corvair Monza Convertible

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Re: Rampy Floods While Parked
Posted by: JimBrandberg ()
Date: June 25, 2020 06:46PM

Do you have insulator blocks under the carburetors? Heat soak into the carburetors from the heads would be something to suspect.
I would expect the inlet valve and float level to cause trouble with the engine running poorly more than flooding after it's shut off.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Rampy Floods While Parked
Posted by: Frank DuVal ()
Date: June 25, 2020 08:45PM

Is the electric pump full time or just for priming?

Is the electric fuel pump down by the tank or in the engine compartment?

When it did start, was there black smoke out the exhaust pipe?

Frank DuVal

Fredericksburg, VA

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Re: Rampy Floods While Parked
Posted by: joelsplace ()
Date: June 25, 2020 08:56PM

Have you checked the fuel pressure?

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: Rampy Floods While Parked
Posted by: RKF ()
Date: June 26, 2020 02:17AM

Great questions.

I don't recall if there are insulators between the carburetors and the manifolds or not. I'll check. If I don't have them, I'll get them.

The electric fuel pump is located at the tank and is full time.

I did not notice black smoke when the engine started.

I have not checked the fuel pressure but I never experience hesitation while driving and the carbs don't flood unless the engine is hot. It's definitely something to check out.

I'll do some troubleshooting and report back.

Knoxville TN

1962 Corvair Rampside
1963 Corvair Spyder Convertible (project)
1966 Corvair Monza Convertible

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Re: Rampy Floods While Parked
Posted by: JimBrandberg ()
Date: June 26, 2020 06:17AM

The stock insulators are about 1/4" thick and a bakelite material. Sometimes you see a thick gasket substituted but it's often not enough.

64 carbs added a flapper valve at the base to alleviate fumes with hot soak. Earlier carbs sometimes had a hole drilled in the carburetor throat to outside which isn't as effective.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Rampy Floods While Parked
Posted by: corventure Dave ()
Date: June 27, 2020 01:06PM

Good points to check here.
Also, I would ask...
While it's running, looking down the carburetors... do you gas dripping down the in the venturie's?
After it is turned off, is there gas dripping down the inside of the carburetor venturies?


Corventure Dave

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Re: Rampy Floods While Parked
Posted by: RKF ()
Date: June 28, 2020 11:09AM

Yesterday I was able to re-create the problem. I got the engine to re-start by placing a jumper wire across the coil resistor.

Today, I re-connected the factory bypass circuit that provides 12 volts to the coil while cranking.

We'll see if that solves the problem. As so many have said before "most carburetor problems are electrical."

Knoxville TN

1962 Corvair Rampside
1963 Corvair Spyder Convertible (project)
1966 Corvair Monza Convertible

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Re: Rampy Floods While Parked
Posted by: MattNall ()
Date: June 28, 2020 11:24AM

As has been stated many times here.. MOVE the coil OFF the engine to the Body..

Heat kills.

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