My truck is having trouble cranking ONLY after I get gas. No I don't try and squeeze every little bit of gas in there. When the pump clicks off, I'm done. I also tried putting about $20 of fuel in there once and it still had trouble cranking.

I've googled and it seems like it would be my fuel vapor canister? Any objections?

My biggest problem would be, where is the fuel vapor canister located?

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2002 3.0 Ford Ranger 4x2, Auto, 250k miles

When you say the truck has trouble cranking, does that mean it doesn't want to turn over when you twist the key, or it turns over just fine, but won't start? Your problem could be several things, but what its actually doing is needed to find a cure.

Turns over just fine. But doesn't want to start right up. After that it will start like normal except when I go back to get fuel.

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2002 3.0 Ford Ranger 4x2, Auto, 250k miles

So when you start it first thing in the morning it fires right up!

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Yes

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2002 3.0 Ford Ranger 4x2, Auto, 250k miles

Anyone?

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2002 3.0 Ford Ranger 4x2, Auto, 250k miles