I have a 70 cs with a 350 2bbl and I got it out of storage yesterday, and when I drove it home it would cut out and back fire. I would let off the gas for a few seconds and then get it back to 55 60 mph and it would usually come out of it. It kept doing that about every 5-10 miles. It did that last year a few times mostly under acceleration and just once cruising. Any help is greatly appreciated.

 

you are able to get out of storage in March?!

Sounds like fuel starvation
clogged filter
crud in the carb occasionally blocking the jets
or perhaps age old rubber lines in the tank to pump run, leaking air in.

 

Sounds like a fuel issue, that is it runs 'til the float bowls are dry, cuts out and repeats. I've seen an electrical problem act that way, but it was just a "blip" cutout and recover. The fact that it takes time to recover rules out electrical problems.

 

It was about 30 degrees above normal here in Sioux falls couldn't resist. No fuel leaks did replace the filter looked like some one painted it the color of rust, but no flakes in it. Haven't taken it back on the highway yet but running good around town. It has the original tank and I'm thinking might need to get a new one in the future.

 

Turns out I have a leaky fuel pump didn't see it with the motor off. I had it warming up in the garage and when I backed it out saw a nice big puddle on my floor. I haven't pin pointed the leak yet but probably will just replace since they are inexpensive.

 

Are you sure it's not the fuel line?

- Eric

 

If it is the fuel pump, you may need to change the oil as the leaking fuel may have drained into the crankcase.

 

Yeah I re tightened them after I got it back to my garage. Thanks for the heads up about the oil.

 

I believe it is leaking from where the pump attaches to the motor so I am thinking of just replacing the gasket and go from there. Anyone have any tips when replacing?

 

A leaking gasket where the pump attached to the block will not cause a miss. It will just cause an oil leak. Don't overlook a bad coil. It doesn't happen often and usually takes a long process of elimination to find it. It is one of those things that will drive you nuts if it is the problem. What Fun71 is talking about is the fuel pump leaking fuel internally into the crankcase. Replacing the pump is the only solution. A standard fuel pump is pretty cheap.

 

Would there be any other symptoms if it is the coil. Also I haven't checked the oil yet but it is an external leak.

 

Pretty much exactly what you describe. Either that or the condenser, or possibly a bare spot on the wire to the points, inside of the distributor, that touches ground on occasion.

- Eric

 

There is still the issue of the puddle of fuel on the floor. I would still be searching in that direction.

 

Yeah regardless of what is making the motor cut out I will need to get the leak fixed so I can at least drive it again.

 

The leak and your issue may be related. Did you check your lines?

 

From what I can tell the lines are good. But it's hard to tell with the alternator on.

 

Anyone know what the fuel pump should be torqued to or does it matter? Also, it was leaking from where the top meets the bottom, not sure of the technical terms for them.

 

Just make it tight, but not too tight.

And that's a weird place to leak from.

The hoses weren't dry or cracked, were they?

- Eric

 

No they aren't. Both the inlet and outlet connections were dry, but right under that lip all the way around the pump is wet.

 

Okay. Sounds like you got that fixed.

It could be the cause of your cutting out, but it could be an electrical problem - only way to tell is to try 'er out!

- Eric

 

Not just wet but dripping wet.

 

Sounds like the diaphragm is leaking, did you replace the pump?

 

Got a new pump in yesterday no leaks, and so far she runs smoothly. Thank you all for your input.

 

ollerich29....I have exactly the same issue with my 64 dynamic 88 2bbl 394. AND YES I GOT IT ON ROAD YESTERDAY AS WELL>>>YAHOO. Streets were swept and it had rained hard the last week so I felt safe driving in March. ( Miracle in MN)
My fuel pump is new, fuel lines new, tune-up 3K miles ago. Carb rebuilt...timing is spot on.
I can travel 200 miles w/o issue and then bang..CUT OUT.
Yesterday it drove fine....then after 20 miles bang ..CUT OUT. Help again>

 

If you look at your old fuel pump, you will see that any leak past the rubber diaphragm will likely result in fuel getting into the cavity in the mounting flange. This means fuel in the crankcase, so an oil change may be necessary.