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Hard start after warmed up

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minitrucker View Drop Down

Joined: 09 Nov 2013
Location: Tulsa, OK
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    Posted: 08 Jun 2015 at 2:48am
First off, the truck:
1980 Datsun 720 King Cab
2.0L L20B
God knows how many miles...LOL

And know, the problem:
I haven't messed with the Datsun in a while but since the weather is going to be nicer, I will get back on it. When I last drove it, last fall, I had a problem with starting after it was warmed up. Once it cooled down it would start with no problem. When the no start occurs, the engine cranks slowly. Kind of like the battery is dead. I have replaced and upgraded all of the starting/charging wires. There is a yellow top optima battery in the bed (brand new). I have two different alternators and two different starters for it. I have had all four components tested and all passed without question. I have replaced the fuel lines and filter. The truck has a Weber carb and I have not messed with it (meaning its exactly how it was set when I bought the truck). I feel like the problem could be there. I can't figure out why it would do it only while its warm though. I have never had a cold start issue since replacing all of the fore mentioned components.

Do you guys have any insight on this or could you point me in the right direction? I don't know where to start as I've never heard of this happening before. Any and all help is greatly appreciated, thank you again guys, in advance.
80 Datsun 720 King Cab (on air)
08 Silverado (4/7 drop)
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