swapped out old injectors because of rough idle and shudder on acceleration. tested by removing UIM and sitting fuel rail up then cranking the engine over, poor spray pattern on all of them with 2 straying a straight stream and one continuing to spray after shutting engine off.

installed reman injectors and changed out fuel pump and sender as well as fuel filter.

primed the fuel rail by moving key to run and back to off 5x before attempting to start the vehicle and have check the fuel rail for pressure off the schrader valve with a steady stream of gas coming out

after reassembly the car refuses to start easily long cranking will get it to barely run and full throttle is needed to keep it running and even then it will barely keep up eventually dying with a backfire.

i've check the fuel rail off the schrader valve for pressure and get nothing except a sucking sound when pushing the valve in when attempting to start normally ie. without priming the rail.

i have checked the injectors by using a tire stem over the top of the injector while using brake cleaner as pressure and a 9v battery to trip the solenoid, they fire just fine and have no leaks.

possibly failed fuel pressure regulator or just crap injectors?

they are from 1aauto and have a warranty so i can return them if needed.

side note i have coolant inside the throttlebody throat which may be the reason for the hard starting as well, is there a way to safely bypass the feed and return lines under the throttlebody until i can get a replacement gasket shipped to me?

edit to add: car has 131k miles but sat for ~4 years before i got ownership of it.

all fluids changed, new battery, stutter started immediately after exhaust pipe hanger failed from rusting through on the pipe itself exhaust from the cat rearwards has been replaced along with new muffler but the stutter remains an issue since approx june of 2017

What is the fuel pressure?

Unknown as i dont own a gauge and o'Reilly doesn't have an adapter to fit the gm schrader valve with their store rental kit.

You can buy a gauge with the hose and schrader valve for under 30 bucks at the parts store. Don't know what they have.

Pressure on the rail measured at 0 psi failed regulator.

Installed new delphi regulator and new injectors from 1a auto, rail holding @44psi car still will not start and has a strong fuel smell under the hood but i cant see anything leaking anywhere.

Plugs are likely fouled and the cylinders may be washed down with fuel.

This is what it does when i attempt to start it


Pulled a plug up front and its wet and near jet black.

They have less than 6k on them

That'* not the way to test fuel pressure. You need to so some testing.

I tested prior to changing the regulator out as well as afterwards rail was dead prior and held 44 psi for a day after changing it out.

Pushing the schrader valve was an attempt to purge any air in the system prior to the start attenpt.