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EFV-8 Club Forum / General Ford Discussion / 91 99 carb questions

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Discussion Topic: 91 99 carb questions

Catimann

05-03-2019 @ 9:50 AM

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Posts: 18
Joined: Apr 2019

Thanks for that info.
My accelerator pump has a blue seal. I will need a different intake needle bcz mine does have the black tip. However I will probably only use our Chevron 94 gas in this as it won’t be driven that much.

Considering how small of a pin hole can cause a vacuum leak I would wonder why there are no seals on the throttle plate shaft. Because even a brand new one has clearance that would let air through.

Today I should get the complete back issues of V8 times. I’m sure there’s some great reading there.

40 Coupe

05-03-2019 @ 5:17 AM

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The taper on the throttle plates goes toward the small holes and with the throttle closed are downward toward the intake manifold allowing two of the small holes to be exposed to the intake manifold.
The power valve has to be able to screw all the way into the Carb. casting. and the gasket has to seal this area. There are some kits that the gasket area on the valve is not flat but may have a step.Do not use these valves. Some have a large radius where the threaded area and the gasket face meet, this radius will prevent the power valve from scr*w*ng in far enough for the gasket to work properly. Also some valves are too tall and when the cast iron base is installed it depresses the valve. Do not use these. Some valves have too much thread length again do not use these. Thread the power valve in by hand without a gasket and make sure it goes in far enough so when the gasket is installed it will seal.
Other item are the length of the accelerator pump. Some kits did not come with the proper length stem on the top. Plus modern gas rich in ethanol and the black plastic like pump diaphragm do not work together well. Also the fuel intake valve needle should not have the black plastic like tip. Dayton Parts in Florida has a good rebuilding kit.
The throttle plates should be bright brass without carbon deposits and when closed you should not see light past the throttle bore and the plates. They should seal the bore very well. The throttle rod has to fit the base to eliminate vacuum leaks. If you decide this rebuild is not for you I suggest Charlie Schwendler see the V8 Times classified services for contact info.

Catimann

05-02-2019 @ 10:25 PM

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This message was edited by Catimann on 5-2-19 @ 10:32 PM

Catimann

05-02-2019 @ 10:25 PM

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Tried several times to upload and just get "Metadata components != number of destination bands" or nothing. Darn

Catimann

05-02-2019 @ 10:15 PM

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I always attempt to take lots of pictures as I take apart things. I inevitably miss things so I have a few questions.
First is this picture of the economizer valve. I now think this valve works on some sort of vacuum and that the height difference is unimportant. Is that right? I ask because the two are different heights and I was not sure if it mattered.
Then there are the throttle plates which are not just two round disks.
here you can see the tapered section.
I think it fits into the carb like I show but even the old vintage fuel repair manual does not give a clue as to if it is right as I show it.
This allows for those two tiny holes to be exposed.

Thanks

This message was edited by Catimann on 5-2-19 @ 10:22 PM

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