110 leaded question

[73440]

I have been using 110 leaded fuel .
Carb is a Carter 4426S,
Engine is a '68 440
Tranny is 4 speed.

Having trouble with restarting after short drive ,maybe 10 miles , at idle car will stall, then a long process of pouring gas into carb.
I did retard timing slightly which helped and that also helped cut down on exhaust popping when letting off the throttle.
The fuel line from the pump to carb , I have insulated.
Have bought the fuel separator and vent lines, not installed yet..
Have a rebuilt Carter 4428S and spacer ready to install.
Have an MSD ignition ready to install also.

I know, I just need to get out in the garage and do the work ,but would like to understand this problem and how to fix.

The fuel cost is the same ,$8.50 gal ,for 110 leaded as the lower octane leadeds , so that is why I buy the 110.
But does that octane contribute to the hard restart problem?
Does it have a different ignition requirement as far as burn rate and such?

Thanks for any info on the 110.

[cudabob496]

what is your compression ratio?

[Strawdawg]

what is your fuel pressure when this occurs?

When you open the throttle, does gas spray out of the accelerator pump and into the carb?

[73440]

Sorry, I don't have details of the engine build or compression ratio.
I know I should be able to use a lower octane if the CR does not demand it, Love the smell of that gas!
No problems using in the Harley.

I will need to check the fuel pressure the next time it happens. and also check when normal running.
Yes, do get a fuel spray , but even in 70 degree weather , I can hear the gas boiling and crackling when pouring into the carb.

Just read about RVP , the reid vapor pressure that needs to be lower in summer to help prevent vapor lock.

The 110 has a RVP of 6.6-6.8 .
Will check the other fuels that Smiley's sells,for the RVP, the shop is within walking distance.

[Strawdawg]

it sounds like vapor lock...could be low pressure, carb getting too hot, or perhaps the gas blend...you might try some different gas just to see if the latter is a possibility

[cudabob496]

or, there may be some simple adjustments you could make to your card.
Make sure its all in tune.
I have a fairly radical cam, so I had to drill holes in throttle plates to make
starting easier.

[73440]

Right, simple is good, sometimes I look right past the simple fix.

Thanks all for the info.

[cudabob496]

could be something simple like idle mixture screws

www.youtube.com/watch?v=XRCUibTkm3o

[73440]

It was running very rich at first and i did adjust idle mixture .
Not saying it is perfect, should tinker some more with it.

I have put up with thru the years with my vehicles kinda running good, got me where I was going, I need to get them running great.

[cudabob496]

http://www.ebay.com/itm/How-to-Rebuild-and-Modify-Carter-Edelbrock-Carburetors-/141614135000?pt=LH_DefaultDomain_0&hash=item20f8dc36d8

[73440]

http://www.ebay.com/itm/How-to-Rebuild-and-Modify-Carter-Edelbrock-Carburetors-/141614135000?pt=LH_DefaultDomain_0&hash=item20f8dc36d8

Thanks,
Love them SA books, have 8 different ones, will get this one.
Have the SA Holley, which I will probably switch to a Holley one day after the new Carter run for a while.

Need patience, just like a doctor.

[jimynick]

Remember that higher octane gas is more difficult to ignite than lower octane gas. That's why it doesn't ping if the compression/temperature is higher and that may be a factor in your starting situation. There are aluminum plates that extend out over the intake from under the carb that help prevent the gas boiling you describe. You may want to check them out. Good luck. 

[73440]

I think trying the lower octane , taking some time to dial in carb adjustments , checking the fuel pressure, ensuring timing is good will help with the existing carb .
The real fix will be to install all the parts sitting in the garage, fuel vapor separator, vent line , new carb, carb spacer, MSD ignition.

I appreciate all the help, now I just got to go do it.

[Chryco Psycho]

I would Start with checking the fuel pump pushrod ,if it is not fully cycling the pump the carb could be low on fuel causing hard starting , no way 110 octane should cause hard starting unless the ign system is weak

[73440]

Hadn't thought about the pushrod, start at the source , thanks.
Saw about a bronze tipped pushrod or is that just for a certain use?

Ignition parts all recently replaced