OK so this is long, i will first describe what was happening.
problem: car would randomly stall for no reason, fuel was not getting to engine. could be 1ft or 1mile of travel...right in there. i drove 120miles between tucson to phx a week before this crap started
info: if i messed with the inline fuel pump fuse it would run a little ways and then stall again.(engine prime fuel i guess would do give it alittle gas)
What i have changed: Fuel filter
Fuel pump Relay
messed with inline fuse(new fuse blah)
New oil pressure switch
New Holly Black inline pump, i just deactivated the old one(left it in tank) and added and piped the Black in by cutting the high pressure rubber hose from the outline right next to the tank and adding more hose into it to the pump, which is sitting just below the tank, upright, about midway back of the driver back seat area, if you know it.
(already had regulator see sig for engine, was v6)
added fuel pressure gauge at the double pumper fuel lines.
Problem now: Engine will run and get 6-7psi of fuel at the gauge and i can drive around for a while and then when i park and check gauge it reads 0psi,all while this "amazing" fuel pump is on. it will slowly charge to 6psi. The problem i have with this is, if i get on it hard for a while the engine will starve for fuel and stall out, then when i re-start it again the gauge will read 0psi and climb back to 6psi. the Fuel pump is running the entire time,and to make sure i ran a temporary switched wired from the battery to the grey wire of the oil pressure switch(goes directly to pump?) and started the engine and got 6-7psi. Drove around about 1-2miles without WOT and parked check gauge while running and it showed 0-1psi....and then slowly slowly climbed to 5-6-7spiked psi while i was parked.

I really need help im tired of spending all this money without results and i need my car for work... and im getting stressed out about this hassle

 

I am slightly confused by how you are wording it, but if you are drawing through the old pump, I would drop the tank, remove the old pump, and install a proper pickup.

 

well i've read you can just leave the old pump in deactivated and draw through it with minimal restriction unless your over x-amount of high horsepower

 

Draw through works for some, not for others.

 

yea with the way its goin im figuring thats the reason maybe its getting clogged or something... but if draw thru isnt working for my car why does it still get 5-7psi right off the bat? jw.

 

I was having the same problem. I also heard that the pump through works for some and not for others. not enough power to pull through both pumps. we ended up having to change the pump inside the tank. good luck to ya.

 

What kind of regulator are you using?

 

well the Black pump comes with one, but i have a 3port mallory in there. I was told its better than the one the Black comes with

 

well the fuel pump is getting 12.6continuous volts..

 

well the fuel pump is getting 12.6continuous volts.. so im thinking its definately the old pump which im taking out soon.

 

Quick question, what are the 4 lines goin into the Fuel tank pump? i know its feed, return,....releases air to canister? and something else?

 

hello?

 

Is this a carb or fuel injection set up?

 

thanks bud but i got it all fixed now, just took out the pump and made it straight pipe.

 

Glad you got it running right.