Fuel Cutting Out Fuel Pump Not Going Out ?

[Mclovin]

My 89 s10 has developed a problem.. i changed the fuel filter thinkin that was it.. it was clogged but its got a new one now.. a little history.. the truck has been VERY modified.. Im running a plastic gas tank from a BOAT on it along with a Holley blue fuel pump wired into the Factory circuit.. ive run this set up for over a yr now.. and just recently its started this.. once the truck gets warm and ive been running it for a while it wants to cut out when i hit the gas hard.. its a 4.3 TBI v6 all stock fuel lines just hooked the holley blue into the feed line.. would a bad TBI unit cause this ??

[TroyDairy]

correct psi and return line plumbed right?

[Mclovin]

correct psi and return line plumbed right?

 

I havent checked pressure.. im gona assume they're plumbed right.. i haven't touched them since i got the truck and its ran fine until now.. and it only does it once the truck has been running for a while..