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Help Me Get This Thing Started
#1
I brought a new puppy home: 71 Mach 1, it's supposed to be an M code 351C (but it has 2bbl heads and a weiand xcellerator intake), C6... It has an edelbrock 1405 600cfm carb (with electric choke) and a Mallory electronic distributor. The ignition wiring is all cut up and hacked, but I do appear to be getting spark. The car hasn't run for 9 years, but was supposedly driven on and off a trailer, so I'm assuming that it was in running condition 9 years ago. Here's the big problem- I'm pretty experienced with cars, but I've never owned anything with a carb.

It had a bunch of broken stuff that I fixed:
  • Starter wiring loose and against the headers
  • no fuel filter, installed clear generic filter between the pump and the carb
  • broken off throttle plate screws- pulled and replaced
  • Cleaned up the inside of the carb- took the metering rods out, took the top half off, soaked everything in carb cleaner overnight. Wiped off/cleaned everything I could reach
  • drained as much of the 9y/o gas as I could, disconnected the line at the tank fitting with the back of the car downhill, put a bit more gas in it and drained that out, blew out the lines all the way to the carb fitting before reassembling. Put 5 gallons of fresh gas in it.
  • pulled the plugs, cleaned them off and gapped them (they looked almost new but covered in soot, I wonder if they were cold or if the last few times it was started it was just idled for a few minutes
  • while I had the plugs out I sprayed a little Kroil into each bore hoping that any stuck/rusty rings would be loosened
  • cleaned up the plug wires (don't worry, pulled one a a time and labled them, didn't get them mixed up)
  • new battery
  • squirted gas into the fuel inlet fitting till it ran out before hooking up the line (I couldn't figure out how exactly the bowls are vented on this thing)

I'm sure I'm forgetting something.

Right now it cranks but doesn't start, it sounds like it's getting compression, I think I had one kick that sounded like it was trying to run, but that might have been carb cleaner and was very weak. My concerns:
  • Installed a clear fuel filter, it took _a lot_ of cranking before I saw any fuel in it at all and a lot more before it was mostly full. I'm used to FI where everything is full before it starts. How long should the mechanical fuel pump take to fill the lines to the carb?
  • I see fuel in the wells that the secondary door weights hang in, is that normal?
  • I don't think I'm getting an accelerator pump shot at all, I'm assuming that the 2 nozzles on the inside of the front bores are the pump nozzles, they're dry when I pump the throttle

Is this all normal? What should I check? Suggestions? When I messed with the carb I was careful to put everything back like it was before I started, I didn't touch the idle mixture screws... should I just set it to a baseline (I keep hearing 2 turns out on them is a good starting point)?
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#2
Change your fuel pump. Or the line is restricted from trash even though you blew it out. Sound like the fuel is just not being delivered and also, you have issues in your carb. Do you have access to a known good carb?

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
Good luck potty training the new pup! LOL
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#4
spray some starter fluid in the carb and/or drizzle a little gas in there. Put the air cleaner back on and see if it 'fires'. If it does you know you have a fuel/carb issue.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#5
I don't have access to a known good carb. Seems like almost all my car guy friends are pretty much in the same boat as I am, only FI.

Should the pump be moving more gas than that? I kind of feel that it should but I don't know for sure. I was actually quite surprised how slow the fuel came out of the tank using gravity. It took maybe 10 min to empty out just under 5 gallons.

Where do I drizzle gas? I have not tried any ether (starting fluid) but I did spray the carb down with carb cleaner while cranking (I've managed to make a lawnmower run like that with no gas getting to the carb), but barely got it to sputter.
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#6
Carb cleaner will kill it so you need to use start fluid in the primary bores. Do you have a spark plug tester? They can be bought for a few dollars to check fire. But sounds like a fuel problem to me
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#7
I stuck a screwdriver in the primary and let it sit next to the manifold and watched it arc. Then I did it in a couple of the plug wires just to make sure that it wasn't a problem with the cap/rotor. Come to think of it, I don't know that I looked under the cap to make sure that the contacts are at all in decent shape, I know I have spark but I don't know that I've got spark on anything but a couple of the driver's side plugs...

I guess I need to pull the cap and go get some ether
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#8
Silverback;86973 Wrote:I stuck a screwdriver in the primary and let it sit next to the manifold and watched it arc. Then I did it in a couple of the plug wires just to make sure that it wasn't a problem with the cap/rotor. Come to think of it, I don't know that I looked under the cap to make sure that the contacts are at all in decent shape, I know I have spark but I don't know that I've got spark on anything but a couple of the driver's side plugs...

I guess I need to pull the cap and go get some ether

Or as stated earlier just dribble a little gas down the carb. what color was the spark after the cap? yellow, blue, white?
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#9
Again, can someone confirm how fast this thing should be pumping gas? Is it like a fuel injected car which I can pull the fuel line and it will pump a couple of gallons in a min or so? Like I'm expecting that cranking for 10 seconds I should fill a cup easily, I'm not getting nearly that flow. It took 5-10 maybe 10 or more second cranking "sessions" to even see fuel in the fuel filter.

Spark yellow blue or white... don't know, always read about that test but stopped looking since it does not apply to most electronic ignitions and never worked on anything else.

Now that I'm thinking about it, it's a mallory aftermarket distributor, all the wiring to it is weird, but I assumed it's working since the PO said he started it at some point 9-10 years ago. I thought it was weird that what I think is an electronic ignition in the distributor is using a conventional coil (I know that can work) and _I think_ has an inline resistor (at least it's still mounted on the front of the head with wiring going to it, I haven't tried figuring out what the jumble of wiring actually is/is doing)
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#10
Silverback;86975 Wrote:Again, can someone confirm how fast this thing should be pumping gas? Is it like a fuel injected car which I can pull the fuel line and it will pump a couple of gallons in a min or so? Like I'm expecting that cranking for 10 seconds I should fill a cup easily, I'm not getting nearly that flow. It took 5-10 maybe 10 or more second cranking "sessions" to even see fuel in the fuel filter.
mechanical fuel pumps run 4 to 10 pounds of pressure on average. not like EFI which exceeds 35
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