1963 IIA 2.25 Dies when hot

[yorker]

With a Weber that really doesn't mean much they'll clog with the slightest bit of stuff and it is surprising how much passes the filters. How much choke does it need when running cold? Also do you have the phenolic block on the intake in between the manifold and carb?

[timc930]

With a Weber that really doesn't mean much they'll clog with the slightest bit of stuff and it is surprising how much passes the filters. How much choke does it need when running cold? Also do you have the phenolic block on the intake in between the manifold and carb?

I pulled the top off a couple of weeks ago to check the needle and seat, and to ensure the bowl was filling. Spotless inside. I've spent hours and hours with carb's (Zenith) on old 911's dealing with trash inside, and this just does not feel the same, as it runs fine, takes full throttle until it get's hot.

Yeah, I have the phenolic block, well it was on the truck when I got it.

Strange thing, is that this just started happening, without any changes as I drove the truck for a year with very little issues, although it has always had what I thought was a fuel flow to cylinders issue.

Should the fuel act like it is "boiling" when poured into the carb? If so, then I have another problem....

[yorker]

Fuel will boil on the manifold, or in the intake manifold when the engine is hot because the exhaust manifold heats it(as designed). Ethanol blends may lower the boiling point too.

[timc930]

Fuel will boil on the manifold, or in the intake manifold when the engine is hot because the exhaust manifold heats it(as designed). Ethanol blends may lower the boiling point too.

Then I may have another problem. This is really odd, as it definitely feels like it is running out of gas when hot, but nothing has changed, so has to be some part failing, as the operating environment has not changed. I'll go back and recheck spark and fuel.

So the other odd thing is, if I let it just sit and idle until it gets hot, it will idle fine, but it will not take throttle as crisp as when warm, and it will NOT take a load at all, that will cause it to die and not restart. So as it gets hot, the volume of fuel getting into the cylinder is reduced for whatever reason...

[yorker]

http://www.aloharovers.com/tech/ichoverhaul.htm

http://www.glencoyne.co.uk/carbs.htm

Well let us know what else you find.

[jcadwell]

How about heat soaking the distributor? Are you running pertronix or points?

[LaneRover]

Have you moved the fuel line? or Changed the fuel line to a different material?

[timc930]

SO this is definitely a fuel problem, as I drove it today a short distance and just as it was getting hot I reached my destination. Let is sit for about 30min while I took the dogs for a quick walk. The truck would not restart without first pouring a bit of fuel into the carb.

I have not changed the lines, but I have slightly moved the top of the fuel line where it peaks (height) at the top of the engine, the make a turn to go to the carb....

[yorker]

Any progress?