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351 c starting issues
#1
Fuel in the bowls is visible.   Can't get her to run.

I would post the video but Sansung is not being friendly.

Kcmash

https://www.youtube.com/watch?v=yvbKQXHpzm0
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#2
By fires, but won't run, do you mean that it seems to want to start when the ignition key is in the start position? But then dies when ignition key is in run?

If so, the starter solenoid ("I" terminal) is providing voltage to the ignition coil, so it will begin to start, but when the ignition switch is in the run position voltage is not being supplied to the ignition coil. Two possibilities, ignition switch needs to be adjusted or the ignition switch is bad.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#3
By firing  I mean it roars to life and then goes straight to dead.

Today:

1) Advanced the timing, started it and ran her for about a minute.  then it wanted to die.  (I had been fanning to keep it running, but we were doing good around 1800 to 2000.  Died after about a minute to 90 seconds like she had ran out of gas.

2) Tired restarting, just as I described.  Advanced  timing a little more same story.  Returned timing to original from today and I get the condition I am in.

3) Checked the metering jets.  They appear to be set good at 1.5 turns.

kcmash
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#4
As soon as it dies remove the air cleaner, look down the carburetor and work the throttle lever by hand, see if the accelerator pump is squirting fuel put of the nozzles, if not you likely have a fuel delivery problem.

If it's not a fuel problem that leaves ignition. As soon as it dies remove a spark plug or connect a spark plug checker and check for spark. If you still have the point distributor it could be either the condenser or coil breaking down. Check the point gap, preferably by dwell angle.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
What Don said ... I'd also be examining all the vacuum lines for leaks ..is it timed vacuum advance? .... very odd it should try to run then stop just when it begins pulling vacuum.

is there an alarming smell of fuel?

is idle setting tuned off ?

[Image: siggy.jpg]

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#6
man that screams fuel problems to me. Do you have gauge to check fuel pump pressure? If not can you just have it pump into a coffee can and check it?
In between those short parts were you pumping it? If so, then it may be bad carb and it was just running off short squirts from accelerator pump?
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#7
(04-20-2019, 03:05 PM)Don C Wrote: By fires, but won't run, do you mean that it seems to want to start when the ignition key is in the start position? But then dies when ignition key is in run?

If so, the starter solenoid ("I" terminal) is providing voltage to the ignition coil, so it will begin to start, but when the ignition switch is in the run position voltage is not being supplied to the ignition coil. Two possibilities, ignition switch needs to be adjusted or the ignition switch is bad.

Is there a factory tach involved?

If yes, in addition to what Don mentions, could the factory tach be bad such that the ignition line is open? Maybe jumper the tach connections together.
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#8
Great suggestions!  Keep em coming.

1) Yes a factory tach.  When she ran for a minute or 2 yesterday the tach was working great, as was the oil pressure guage.

2) I am thinking fuel problem too.  Just not sure what to check.  Fuel facts:
 A)  I have a clear filter so I can always see the fuel coming in and have clear sight glasses and everything is full.
 B)  I replaced the fuel pump when starting for the first time last year.  She created enough pressure to show me all the leaks when I have them.
 C)  Nope, no prominent fuel smell or black smoke out the exhaust.

3) Accelerator pump?  Works good.  Solid dual stream squirt with every pump.  I should be able to keep her fanned and running if fuel were the culprit.

4) Vacuum advance.  My idiot area!  When I can't get the thing to idle I can't measure or adjust anything.  I bought a refurbed distributor with vacuum advance.  Changed the points to the Pertonix Ignitor III.   Vacuum advance is connected to the metered vacuum on the Holley.

Other info:  I tried starting fluid and pouring gas down the carb on a couple of attempts.  Usually I get a little more run time from gas down the carb,  I am frustrated with how sensitive the timing is on this thing.  If it is not dead on, the thing won't fire.  I have never in all my years had so much trouble getting a carbureted V8 to run.  

For those of you who don't remember, I did get it to run for about a half hour last year to break the cam in.

https://www.youtube.com/watch?v=JPTG_HP9b3M

I can't imagine a catastrophic vacuum leak after that run.  I did change carbs from the initial start as you can see if you compare the videos.

I feel I am missing something simple.

kcmash
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#9
I think you may have a problem with the pertronix III, heard it’s pos. What coil are you using with it? If stock coil, that can be a problem. The best pertronix are the I used with a stock coil, or the II with the pertronix coil. Hopefully it’s something as simple as that.

run_horse Run Horse Run!
John 72 Q Code
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#10
I would go back to points, it helps to eliminate a potential failure point, one at a time. Others have had Pertronix 3 problems.

Get one of these spark checkers, make sure you are getting spark, check for spark as soon as it stalls.
https://www.harborfreight.com/in-line-sp...63590.html



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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