68 Charger.727. It has a mechanical fuel pump and rubber lines right now. Car likes to shut off in warm weather especially if you make a short stop and go again. Starts up again fairly easy but is a pain in the rear.After you are cruising again it seems ok. I have already installed a carb spacer and that did not help.
Thanks mIke.

I had similar fuel vapor-lock situations with my Charger.

Re-routing fuel lines away from heat can help.

On the cheap, I have wrapped mine in aluminum-backed foam insulation (hardware store) and use an aluminum heat deflector plate under my carb. Performance shops sell woven fiberglass wraps and sleeves, like those used for spark plug boot and wire protection, etc.

There is also a product known as "Fire-Sleeve" which you can purchase. I have used it on the fuel lines in my airplane.

http://www.aircraftspruce.com/search/search.php?s=FIRE+SLEEVE&x=0&y=0

You could make heat deflectors (like ones used on mufflers and catalytic converters). You could even use a cool can as well.

You have either a leak in the suction side or more than likely a restriction in the suction line. That's why it seems ok in the cool weather, gas is hard to suck the hotter it gets and there can't be any restrictions otherwise you will have trouble. Heat only effects the suction side of your fuel system, not the discharge side. I have 2 cars running with mechanical fuel pumps and rubber lines. I have run them both in real hot weather and idled them forever in traffic...in July in Vegas. They start with the flick of the key in all weather.

Challenger 1 (above) may be on to something.

Could be a pinhole leak, weak diaphragm pump, etc?

I have an electric fuel pump with regulator and return line on my Charger. In addition to the fuel line insulation, I have both a phenolic resin base plate spacer AND a Holley Aluminum Heat Shield deflector plate under my carb.

Get rid of the rubber fuel line !!

+1

Not only is it the cheap way of doing it, it looks gaudy. So does excessive SS Braided lines. Take the time to bend a coathanger around the curves of your engine block giving it maximum exposure to the draft of your fan...then copy that design to your hardline. I run a 3/8" brake line from the mechanical pump to the SS Braid feed on my Dual Quads. A Phenolic spacer helps your vapor lock issue. I have to replumb a new line when I install the Fuel/Vapor Separator in line with my fuel line.

fwiw, i finally fixed my issues by going to an electric fuel pump. You can also run an electric through a mechanical and use the electric when it's hot.

I will ditch the rubber lines. The fuel pump is a brand new one from Mancini. If all else fails I will have to go with an electric one.
Thanks mIke

I had a weak fuel pump do that before. Engine would shut off when warm, had to let it sit and cool and she would fire back up. Carb was bone dry and no amount of cranking when hot would produce fuel. Turned out the fuel pump was weak enough that the factory vapor separator was sending enough pressure back to the tank that the fuel pump could not overcome it. As a band-aid fix I put a hose clamp on the return line, problem solved. I eventually fixed it proper by eliminating the mechanical fuel pump and vapor separator and installing an electric fuel pump back by the tank. Single best upgrade I ever did.

I used header wrap around the steel fuel lines. Is effective for the hot summers here in Texas.