Daytona Vapor lock?

[earlyrides]

We just finished? bringing a long dormant Daytona back to life at our shop in SoCal for the original owner after over a decade of sitting. The engine runs well at first but stalls out after it gets warm. It had an electric fuel pump that someone previously installed between the mechanical and the carb. We removed the electric but noticed that the mechanical fuel pump on the engine looks like a PEP BOYS special and doesnt have the return port for the 1/4" line going back to the tank. We fabricated a 5/16" hardline to run up through the alternator bracket and around the distributor and up to the AFB along the intake.
Could we be boiling the fuel in the hardline?

We are thinking upgrading to braided line going up to the carb coming from a Carter HO fuel pump to reduce heat and up the volume potential to feed the thirsty 440. Possibly running it to the outside over the valve cover

Any ideas out there?

 

[Deleted member 214]

On my 70 Road Runner 440+6, the return line comes out of the side of the fuel filter, not the fuel pump. Ran it with a Carter mechanical pump in Texas heat and never had a vapor lock problem. PM me if you need pics of my setup.

 

[Deleted member 214]

Did ya get the pics I sent?

 

[sumbit]

Did you check your choke pull-off? Have you adjusted your idle air/fuel mixture? Checked for vaccum leaks and checked your vacuum reading cold/warm? Just for fun I'd try swapping a known-good carb off a running car and see what happens. Fuel pressure should remain constant regardless of engine temp. Also, junk in the gas tank will move/be sucked toward the sock the longer you run the car and the more you rev it. Is the tank clean and the sock new? Good Luck!

 

[earlyrides]

Thanks guys!

We got the pics. Thanks.

The choke is wired open on this "known" good running carb.

Good idea about the tank. We will check the sock and replace it after cleaning the tank out.

Thanks again. I will post an update as soon as we get it going. Hopefully this will help someone else in the future.

 

[earlyrides]

WHOO HOO! Problem solved!

First of all; thanks to everyone for the helpful hints.

Now for the goods:After each "improvement" we test drove the car until warm to check to see if the problem was still present. As this was a customer car, we didn't want to spend any more money than was necessary.
- Checked the tank and sender sock. - Okay.
- Removed the filter just ahead of the fuel pump. No luck.
- Replaced the "Kragen special" fuel pump with Carter. No luck.
- Installed -6 braided stainless line from pump to carb. No luck.
- Insulated the hard fuel lines from the torsion bar cross member forward. No luck.
- Insulated the -6 line. No luck.
- Wrapped the right side header. No luck.
- Installed the Edelbrock insulating carburator gasket. Whoo Hoo!

Was it just the carb gasket? I doubt it. Probably a combination of everything. At least thats what I told my customer.

We took it for a long drive up and down PCH in huntington Beach on a 80 degree Saturday. He said that the 45 miles we drove that day was farther than he had driven the car in 10 years. He also thanked me for giving him back the confidence to drive the car more often.

So if you see a 60+ year old guy driving a black winged car, Give him a thumbs up to encourage him.

Thanks again to everyone for thier interest and helpful advice.