Hello,

I am stumped on what I think is a very simple problem. I have a 63 plymouth valiant two door hard top with a newly rebuilt slant 6 225. It is a 3 speed column shift and is completely stock with the exception of a pertronix ignition mod. I rebuilt the carb (it was the original ) when I put the engine in a couple of years ago and only have around 1000 miles on it.

Problem: While driving under acceleration, the car acts like it's running out of gas. This only happens under load like a hill or taking off from a stop light.

What I've done: I checked the fuel flow before the filter by disconnecting the fuel line and cranking the engine. At first, nothing came out but then it poured out pretty well.

Next I replaced the fuel filter and fuel pump just for fun but the problem has persisted. I now suspect the carb, which I suck at diagnosing being born well after the age of fuel injection began. It is the stock 1 barrel holly 1945. Any suggestions on the next step?

Thanks,
Dave

The sock in the fuel tank could be clogged up with rust.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Accelerator pump may not be providing correct shot, dirt in the carburetor, float level incorrectly set, or you may have a vacuum leak. The car is acting as if it has a lean condition.

How long since the last carburetor rebuild?

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

A Holley 1945 is not the stock carburetor for a 1963 Plymouth; 1974 was the first year for the 1945.

Does the car stumble once immediately when you step on the accelerator, then pick up and run okeh? Or does it begin to accelerate, then stumble and surge after a second? The first condition is caused by a faulty accelerator pump. The second is caused by other faults in the carburetor.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks for the replies. Sorry, you're right, I have the 1920 holly on there, just been researching so many carbs I'm getting overloaded with numbers

In answer to the questions, the carb was rebuilt by myself 2 years ago but I haven't driven it much, only about 1000 miles. Kind of my Sunday driver.

Dan, when I first start the car up, it actually runs fine even under acceleration. It's only after a few minutes that it begins the symptoms. It will cruise along with not much throttle, but if I open it up, it will begin to accelerate and then start to die as if starved for fuel. If I back off the gas, it will keep running. If I stay on the accelerator, it will die.

Also, I have a clear, inline fuel filter just before the carb. There is little to no fuel in the fuel filter now whereas before, the fuel filter was almost completely full.

Check the fuel lines from the tank to the carb for any signs of cracking or leakage. Its possible the fuel pump is also the problem.

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55' Dodge Stepside
64' Plymouth Valiant V100
67' Dodge Coronet 500
73' Dodge Dart Sport

belive it or not I had the same problem when I first got my lancer going.. it was the rubber fuel line off the fuel pump!!! Every time I would put a little throttle to it, the engine would tilt just enough to crimp the rubber line...I shortened it a little and never had "that " problem since..

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Its so nice out side, I think I'll go lay under my car..