redcamaro83

car starts fine colds but after driving long periods or just enough to get hot, if i cut it off leave for 20-30min or so have to hold accelerator to floor and crank a long time before fuel comes and engine starts. usually runs rough for a min afew wot puches and it runs like a sewing machine.

Zokal

You could always do it like the old school mechanics by putting something on the gas line to pinch it. I used to always use a clothes pin.

redcamaro83

did a search
will try some heat shield or rubber hose around the steel line next to block.

any other suggestions

bulletboy29

Cheapo electric pump back by the tank.

redcamaro83

like those cheapy facet pumps the local parts store sell for like 50

bulletboy29

yeah...I got one for $30. Think it's a purolator? sp?

demonchild

1) relocate the fuel line so it does not fun between the water pump and the engine block.

2) run a fuel cooler.

these will definently help out. However, if you have a stock 305, i dont see how it could be vapor locking unless there was another problem with the carb. You said you only have this problem after the car has been run for a bit and then shut off for 20-30 mins. This problem sounds more like too much fuel becaseu of the choke sticking open when its not supposed to. Take the chock apart, make sure the wound spring is in good shape and spray everything with some carb cleaner.

MrDude_1

no one pointed out the real problem.


find out where, and teh reason why the engine/exhaust is dumping excessive heat into the fuel system.

then you solve that.



common problem is putting headers on, and not bending the fuel lines out of the way.

RB83L69

That isn't "vapor lock"; it's the exact opposite of "vapor lock".

"Vapor lock" is when the fuel in the line vaporizes, and the fuel pump delivers fuel vapor to the carb instead of liquid fuel. Needless to say the car runs very very lean under those conditions, if it runs at all.

The condition you have is where the fuel in the fuel lines is very hot, yet remains liquid under pressure, and evaporates when in the carb; and bubbles all up out of the top of the carb and sloshes into the engine. Then when you try to start it, the engine is flooded, and you have to do the un-flood thing (hold the gas to the floor until it starts) and wait for it to quit blowing out black smoke before you can drive it.

The most usual cause is the fuel pump being heated up by the block. Make sure you have a fuel pump gasket, or even 2 of them; and a gasket between the FP blockoff plate and the block.

phess11

I would also check to see if you are getting a good spark. Ignition control modules have a tendency to fail when hot.

redcamaro83

yep will do u just keep helpin till it hurts...lol
thanx again