Hot gasoline won't run

[ff5013]

I have a 72 Chevrolet C-10 truck low rider, it has a 2004 Chevy LS motor in her and they took off the fuel injection and replaced it with a Edlebrock Carb. When she heats up to running temp and you cut it off it won't crank back until it cools off.
My friend is a drag racer and he suggested using a clothes pin and place it just before the fuel filter on the rubber fuel line and this should stop it from not cranking or running. He thinks it is causeing a vapor lock.



Please help with any ideas or suggestions

[68Formula]

Nice looking truck. Shame they removed the fuel injection. The stock LS truck intakes flow very well.

First make sure your fuel pressure is correct. Edelbrock recommends 5.5 to 6psi at idle.

Next check the fuel line routing. Make sure it's away from sources of heat (headers, cylinderheads, EGR components, Coolant delivery components, etc.). There are also thermal wraps available, that you could put over the lines.

[TheJDMan]

Are you saying it will crank with the starter but not start, or is it not cranking at all? If it is cranking but won't start it could be vapor lock (and no clothes pin will do squat), if it won't even crank that has nothing to do with the fuel system and probably needs to have a heat shield installed between the starter and header.

[ff5013]

it runs and when it gets hot 180degrees which is thermostat is for and if you don't pat the gas when you stop at a stop light it will shut down. It does turn overjust won't stay running. I was told a spacer for te carb might work. might look into EFI.

[sam 74]

check to see if your fuel lines are to close to a heat source, if so move as needed or you can try to wrap in a heat sheild. you may also need a spacer for the carb, preferably not metal, if your boiling the gas in the fuel bowl, you may want to look into lowering the under hood temp as well that may help a bit.

[Grease Monkey 23]

Had the same problem on a blueprint 355. Edelbrock 1406. Ya need a carb spacer from edelbrock. Also what octane are u running? We switched from 87 to 93 and it cleared the problem up right away. Hope u get it figured out. Drove me nuts for about a week!!

[George Az]

Edelbrocks are notorious for heat sink. In the summer even at 5000 ft where I am the road temp is regularly over 100 f. You need a good fuel filter and you need a phenolic carb spacer. At least half inch to one inch. The four holes give better low end torque and open spacer give a little more in the upper end, so the theory goes. There are a cheap and quick fix, you need longer studs too and then, Don't forget to check your linkage after the spacer install - ask me how I know!

Also, I can't talk enough about a good fuel pressure regulator. Do it. Edelbrock does not like more than 6lbs, and many a "stock mechanical fuel pump" can put out over 8 lbs. This will flood your carb. Mine happens to be happy at 5 lbs. Considering these little gauges are reading minimal pressures, it is just a number. learn your system. Once you have it dialed in, there are pretty forgiving.

Good luck.

[thumper877]

I had a truck do the same thing rerouted fuel lines same thing turned out to be fuel pump

[MonzaRacer]

Being an LS that means you have an electric fuel pump. So first of all make sure you have a heavy duty, at least 30 amp relay, hard fused to battery on the power side. I like to also add in a oil pressure closed ground control, this way the engine quits so does the electric pump. Oil pressure comes back fuel pump comes back.
ALSO do not dead head the pumps, this over heats the pump and the fuel. So use a bypass regulator. for the price go ahead and buy one that has a boost reference port, this way if you ever get itch for boost you have it. Just plug it with a vacuum cap.
I agree with phenolic spacer, carb shields, and checking fuel line placement.

[JEFFTATE]

It sounds like the fuel level in the carburetor bowls may be too low.( The engine is starving for fuel at idle.)
And it's heat soaking and boiling (evaporating) the fuel out of the carb when it sits, after it's hot .
And it's vapor locking. ( It's getting an air bubble that won't burp through.) So no fuel goes into the carb after it sits and the fuel boils out of the carburetor's float bowls.

Check the float level in the carb,
Check the fuel pressure.
Re-route fuel lines in necessary.