C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Engine started last week, but not today

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Old Jun 16, 2024 | 09:29 PM
  #21  
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I'm going to agree with bikespace. Before you go anywhere else,... Dribble a several oz of fuel into the carb, and get the engine lit. Pretty much all pumps are better at pushing than sucking, and at cranking speeds - the new fuel pump may not be developing enough "suck" to pull fuel in from the tank (especially with a fairly low fuel level in the tank). .

If the engine lights and then dies - try doing the same thing one or two more times - if you are still not successful, the odds are that there is either a restriction in the fuel supply line to the pump, a clogged sock in the tank, or there is a leak in that line - and the fuel pump is sucking air not gas..

To check for a restriction in the lines - the easiest way is to undo the supply line to the pump, and then push compressed air thru that line to the tank. (Ideally - it's better to push compressed air from the tank side to the pump - but getting to that line can be a real PITA.) DON'T run 90 psi compressed air - regulate the air pressure down to less than 10 psi
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Old Jun 18, 2024 | 04:16 PM
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Ok I'll give that a shot this time.
What do you guys use to get fuel into the carb by hand? I still have half a gallon in a spare tank from when I went to make sure the car had gas in the tank.
And the fuel is squirted into the carb where the air door opens up right? Where it looks a little bit like target crosshairs?
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Old Jun 22, 2024 | 03:51 PM
  #23  
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I tried priming the carburetor today and nothing new happened. No sputters, the engine didnt try to turn over, nothing. Just the usual starter doing its thing.
I'm at my wits end at this point
I feel like it's going to be something really stupid that solves the problem.
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Old Jun 22, 2024 | 07:00 PM
  #24  
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Sounds like a spark problem. Have you removed the cap and inspected it? Are the points opening and closing? Just for fun, for testing only, you can bypass the ignition switch and wiring by running a wire from the positive side of the coil to the positive side of the battery. See if that helps to start the car. Jerry
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Old Jun 22, 2024 | 07:25 PM
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So - you got some gas in the carb - correct.?

After you primed the carb - did you see fuel come out the accelerator pump nozzle when you operated the throttle linkage? I ask because it typically takes several cycles of fully depressing the gas pedal / operating the throttle linkage before the accelerator pump system is fully "primed" - and functioning normally - so if you tried starting the engine without doing so - you had no gas sitting in the intake.

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Old Jun 22, 2024 | 08:38 PM
  #26  
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Originally Posted by A_BoxOf_Raisins
I tried priming the carburetor today and nothing new happened. No sputters, the engine didnt try to turn over, nothing. Just the usual starter doing its thing.
I'm at my wits end at this point
I feel like it's going to be something really stupid that solves the problem.
Pictures. It's going to be pictures that solve the problem. At least we know it is probably spark. Do you have a way to test for spark?

And can you confirm that the carb squirts when you work the throttl (by hand)?
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Old Jun 22, 2024 | 09:26 PM
  #27  
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So I also went back because someone mentioned it, and I found that the rubber fuel lines going to the carb have collapsed from vacuum; they're squeezed flat. So they're blocking fuel flow. But also idk for certain if I primed the carb correctly either. I might not have put enough gas, or I might not have squirted gas in the correct place.
Either way, when I actuate the accelerator by hand there is no gas squirting out; and no, unfortunately I do not have a way to test for spark either.
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Old Jun 23, 2024 | 08:45 AM
  #28  
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Originally Posted by A_BoxOf_Raisins
So I also went back because someone mentioned it, and I found that the rubber fuel lines going to the carb have collapsed from vacuum; they're squeezed flat. So they're blocking fuel flow. But also idk for certain if I primed the carb correctly either. I might not have put enough gas, or I might not have squirted gas in the correct place.
Either way, when I actuate the accelerator by hand there is no gas squirting out; and no, unfortunately I do not have a way to test for spark either.

OK ...- so it sounds like you did Not get the fuel into the carb float bowl. But that's OK... IMHO - the next thing to do - is to replace that rubber fuel line that's collapsed. Normally the line from the pump to the carb is under pressure from the fuel pump - but rubber line is cheap - just replace it (a lot of fuel lines made in the 1960's 1970's, 1980's, and even 1990's are not happy with the 10% Ethanol in today's gas and deteriorate fairly quickly when exposed to it).

While at the auto parts store - buy a can of Starting Fluid. After replacing the fuel line, open the throttle fully by hand, and spray starting fluid into the carb - I'd recommend about a one second spray - Max. Quickly close the throttle, and immediately crank the car over. No need to touch the throttle when cranking it over after the starting fluid. If the car runs for a few seconds - it's running on the starting fluid - and the cause of the no start is likely the fuel system. Starting fluid is not real nice to the engine, and many of us don't like to use it - but occasional use is not the worst thing in the world - just don't go crazy spraying it....

And BTW - probably the easiest way to check for spark is to pull a spark plug wire, and temporarily throw a spark plug (any spark plug - a lawn mower plug is fine) into the end of the wire. Hold the threaded surface f the spark plug against something well grounded (say the alternator housing) and have someone else crank the car over for a few revolutions (you only get a spark to a given spark plug one time for every two engine revolutions), and see if a spark jump the spark plug gap. If so - you have spark.
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