Hey guys have an fc rx7 turbo and am having fuel pressure problems...

Car sat for a long time has a new intank pump and a new external pump (bosch 200 that replaced the bosch 044) injectors have been cleaned and flow tested, all new fuel filters and new fuel lines to the surge tank and to the fuel reg.

The car starts from cold and holds fuel pressure at around 40psi drives fine except in boost as it gets to about 4.5-5k and its like it's starving for fuel and hits a wall and splatters...then after a while driving the fuel pump will start whirring and the fuel pressure will fluctuate and eventually stall the car then fuel pressure will be 0. It left me stranded a few times today and had to baby it home I replaced the fuel pressure reg today as I thought the old one was no good but its doing the same thing with the new one. There's no fuel leaking anywhere so I don't know where to look next....car is running a microtech ecu.

I got it home after stalling heaps of times and fuel pressure was lucky to be 0-10 on the way home when i got home it bounced back up to 20-30 and was fluctuating... any help would be appreciated (and yes i know i cant leave the reg zip tied like that was just to test if that was the problem haha)

This is the intank fuel punp strainer Looks to be choking...maybe a blocked fuel tank breather? Strainer and pump is barely a month old....

 

if it is a plugged breather, its really easy to diagnose. if the gas tank isn't all the way full, just loosen the gas cap, or take it all the way off.
if that fixes it, then the tank vent is the small hose at the charcoal canister, so you can see if that is plugged, and if its not maybe the canister is

Green arrow is forward, and red is the hose i'm blabbing about

 

Tank is 1/4 full so I can take.the fuel cap off and drive around??

The vacuum line to the canister is the small one? I tried to blow through it yesterday from the engine bay and its showing some resistance.

 

yep! and yep! its a small hose, so it doesn't flow a ton, but it should flow something

 

I will try that soon hopefully it is the problem because the old strainer i took off held its shape and didn't implode like that...so there has to be vacuum in the tank.

 

Car revved out in second gear with the fuel cap off still wasn't great in power and when I got to the destination wich was about 10-15 away the fuel pressure started fluctuating again. I'm at a loss with this car

Going to be a scary drive home.

 

car revved out in second gear still lacking some.power then when I got to my desitnatiom 10-15 minutes away fuel pressure started fluctuating and could hear the bosch fuel pump whirring. I am at a loss with this car.

going to be a scary drive home

 

do you think.it could still be a bad breather...it wasnt revving right out before..but now it is with the fuel cap off. Just still have the fuel pressure problem tho?

 

so with the gas cap off it still does it? i'd maybe put a voltmeter on the pump and see if the voltage drops or something

 

if revs out now where as before with the fuel cap on it did not would get to about 4.5k and run out of puff.

think i found my problem tho this why its choking after a few boosts pulls....

 

boo, yeah you might clean that out

 

what i think was happening is all that gunk was blocking the pump after a while of driving(after a few boost pulls)....the intank strainer was sitting ontop of all that gunk and thats why the strainer is bent it was basically half blocked....pulled the tank out now time to clean and seal somehow.