Slant Six Forum

Weber 38 DGES problems
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Author:  briwill [ Tue Nov 24, 2020 8:45 am ]
Post subject:  Weber 38 DGES problems

I rebuilt my slant over the summer. Added an electronic ignition, Super six intake and Weber 38 carb. Car ran pretty good but idled a little rough. I pulled the carb and adjusted the float although I was not confident it was done correctly. I found about a dozen different opinions and instructions on doing this. Very confusing. Car runs exactly the same but now after the car sits for a couple days, I have to crank the car over for about 15 seconds before it starts. Seems like the float bowl is leaking and has to refill before it will start. Any advice?

Author:  kesteb [ Tue Nov 24, 2020 8:30 pm ]
Post subject:  Re: Weber 38 DGES problems

If you could answer the following, then maybe we can help.

1) Is the flapper valve on the exhaust manifold working?
2) Do you have a heat shield between the carburetor and intake manifold?
3) What is the fuel pressure to the carburetor?

Author:  neilskiw [ Thu Nov 26, 2020 9:25 am ]
Post subject:  Re: Weber 38 DGES problems

I also experience a similar phenomenon on my '64 with super 6 and Carter BBD. I do have a thin aluminum heat shield between the carb and manifold.

I attribute it to the exhaust heat boiling or just evaporating the fuel in the float bowl, or some sort of leak down of the fuel between the fuel pump and carb, or both. I just expect to crank a bit longer after the car has sat a while. On the plus side, it begins to build oil pressure before firing off.

When I pull into the garage with a hot car, I immediately lift the hood to allow the heat to escape and reduce the boil and gasoline fume issue in the garage.

Author:  briwill [ Mon Nov 30, 2020 9:33 am ]
Post subject:  Re: Weber 38 DGES problems

I don't think heat is an issue and I do have a fuel regulator set at 3psi. Even if I run the engine for a few minutes, and shut it off. I have the same issue the next day. It seems like a float/bowl issue but finding clear instructions on setting the float is difficult. I don't think it is related to the rough idle problem but I will soon do a compression check to rule out any mechanical issues.

Author:  ceej [ Wed Dec 09, 2020 3:48 pm ]
Post subject:  Re: Weber 38 DGES problems

It's been a long time since I had a Weber on anything... So just a random thought.

Idle air bleeds plugged? Is the idle air mix behaving properly?


Author:  briwill [ Fri Dec 11, 2020 1:11 pm ]
Post subject:  Re: Weber 38 DGES problems

The carb is brand new so I doubt anything is plugged. Yes, the air mixture screws are behaving normally.

Author:  enrique lopez [ Wed Mar 17, 2021 10:29 am ]
Post subject:  Re: Weber 38 DGES problems

Do you have an electric fuel pump?
Or a mechanical?

I have an electric fuel pump,, and every morning, the fuel line is empty. I guess I have to add a check valve.. I do not have my fuel pump connected to the oil pressure meter because of that reason. I let the electronic pump run about 10 seconds,, and truck starts right up every time..

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