Hard to start after sitting for a few hours

[John H.]

1967dart 225. Car starts find when cold after setting choke. After car sits for a few hours it is hard to start. Have to pump accerator for a while to start. Replaced carb a few month ago.

 

[440fury]

1967dart 225. Car starts find when cold after setting choke. After car sits for a few hours it is hard to start. Have to pump accerator for a while to start. Replaced carb a few month ago.

Have this exact problem on a 74 Duster - I've played with timing and vacuum advance but nothing would help. Apparently, the slant 6 metal fuel line and carb are prone to heatsoaking after the car is shut off which leads to fuel boiling and/or vapor lock. Found a solution that, although only through one day of driving so far, seemed to work for me. Replace metal line from pump to carb with 5/16 ID fuel injection rubber hose. I believe its called the "fuel line mod" on several slant 6 forums.

 

[440fury]

Slant Six Forum, :: View topic - Fuel Line Mod Improves Starting & Driveability

 

[John H.]

Thanks. I'll give it a try.

 

[slantsixdan]

Yup, do the fuel line mod. Also make sure your manifold heat control valve isn't stuck in the heat-on position.

 

[diymirage]

my 225 did that

ripped it out, dropped in a 360 and never a problem since ;)

 

[Slantsix64]

fuel line mod and a thick gasket under the carb will also help also i would use a 180 thermostat i was running a 195 for a while and i had that problem alot more