you can rule out the fuel pump it it accelerates fine. is it carburated or efi

 

Look in a shop manual and find components that only function once the trucks reaches normal operating temp and test them. The only one I can think of at the moment is the EGR valve. You can remove the vacuum line from the BVSV to the EGR and plug it off (I use a golf tee) to see if the problem disappears.

 

22R = carburetor. it could still be the fuel pump. the diaphragm of the mechanical fuel pump can be leaking but still pumping gas through to the carburetor. mine was doing that a few months ago. i was getting tiny amounts of gas sprayed all over my intake manifold and carburetor, but i could still accelerate/drive the thing just fine. fuel lines all checked out. i replaced the fuel pump for about 30 bucks, and i had no more gas leaks. that was about 3 months ago and still no gas leaks.

 

Did your's seem to run ok when cold, then start getting wierd once the pressure built up and started spraying

 

remushair, it could also be the auxiliary accelerator pump diaphragm (AAP), and after reading your post again i would bet that that's your problem instead of the fuel pump. on the driver side of the carburetor, just below where the fuel line from the fuel pump connects to the carburetor, there is a vacuum hose connected to a little metal cap held on to the carb by three screws. when your truck is warmed up and sputtering/etc. remove that vacuum line and see if it's wet or smells like gasoline. if it is, then you need a new AAP diaphragm. it's a cheap and easy fix. you don't even need to take the carburetor off the vehicle. just remove those three screws, pull the cap off and replace the diaphragm. make sure it goes in the same way as the old one came out. you might need to remove that fuel line from the fuel pump first just to get it out of your way. be sure to clamp it or plug it so it doesn't leak gas everywhere.

here's a few pics of what the AAP looks like, what it looks like disassembled, and what a hole in the diaphragm looked like on mine:

 

Hey thanks for all the info guys. It seems to only be wet underneath the fuel pump itself. the two lines the route downwards from the fuel pump are what get wet. Also have a little oil leaking around wear the pump meets the head, but will be fixing that this next weekend. I'm leaning towards the fuel pump diaphram as it the pump itself is wet as well as everything in that general area. I'm going to replace the fuel pump and install 3 new lines that run off the pump with good hose clamps...if that doesn't solve the issue, then it'll be moving on to the carb.

 

So I have a 20R head. Will I need to purchase a 20R fuel pump for the head or will a 22R pump work? The price difference is substantial! 36$ for the 22R pump, $91 for the 20R

 

I will post picks of it up and point out where I'm getting the fuel spray at. That may assist some of you. Nothing under the carb is wet...only the bottom of the fuel pump and the two lines side by side coming off the back of the fuel pump....(looking from the front) Mind you it is a 20R head.