no fuel spray on start

[nlranger]

i got a 1993 cheyenne 4x4. the truck will not start without priming. i have to unplug iac prime and let idle for 10-15 minutes. after that i'am good to go. i can shut truck of and restart if i do not leave her to long. i changed fuel pump a couple of times. fuel comes to trottle body but will not spray without priming on cold start. i never checked fuel pressure. any help appreciated.
thanks

[taillight]

Check the fuel pressure off and at idle. Should hold pressure.

[nlranger]

thanks for the reply taillight. so even what seems to be good gas flow at the trottle body. the pressure may not be there. correct? i do not see a place to check for pressure on top. i think its down under in a hard spot to get at. can someone let me know. thanks.

[nlranger]

i forgot to mention that i bought a cheap codereader and got the following code errors 15,22,54

[taillight]

What engine? You may have to break into the fuel line.

[nlranger]

v8 7.4

[taillight]

My book says there is a fuel pressure connector in the line. I don't know where it is but there is one

[taillight]

I found one on a 7.4 in an 98. The valve is on the front of the fuel rail.