running fuel through trans. cooler....
 

I don't know how to search for this so i wrote a post on this. What benefits would i get if i were to run the fuel line through the trans cooler in the radiator and to the carb?

Warm fuel mixed with trans fluid, assuming you have an auto trans.

Else, fluid that is at or near coolant temp. The MPG gains would be slight, if even present, but it couldn't hurt, so do it and report back!

std trans.This will be on an 86 toyota 22r truck.I have a Holley/Weber carb,header,Jacobs ignition,Spintech muffler.I also have the Carb Enhancer,but not sure if it does any effect.

On a carbed car, you run the risk of vapor lock and the loss of fuel via evaporation when the car is turned off.

the fuel pump has a return line going back to the tank.will this help with the vapor lock?

You might be better off making sure your exhaust system is tuned for your engine and engine speed, Autolounge.net | Calculators | Exhaust Pipe Sizing
to make sure that your set up is not hurting what you are trying to do.
If you really want to warm your fuel you are going to need to make sure you don't get it too hot, I would almost say to make a thermostatically controlled warm air intake and put your fuel line inside of that.

What would be considered too hot for the fuel temp?

WOW! 1.32 in. exhaust pipe diameter for my engine?

between 100 and 400 degrees Fahrenheit.
Boiling Point - Fuels
Depending on the additives, the pressure, the age of the fuel, personally I would try to keep it under 100F if possible.

the radiator is in use when thermostat is open. That means engine is full warm on the cold fuel..before warming the fuel. This is silly....I hope you see why.
toyota 22r...the tank is soft mounted. I can see why you would want to make a quest to make it lively (warm)... I am on this gas subject recently with an old subaru welded into crazy strong.. the hard mounted tank needs to be urethan strapped to calm down hard resonance (way to active...proof in the venting)

warm the carb somehow, leave fuel alone til last second before engine..heat riser ideas galore.