Car stalls. Can’t figure it out

It is fuel related. Upon plugging in the AP the fuel pressure is fine but suddenly drops and the cars stalls. It runs a few minutes on cold start but only seconds when the car has been started a few times. One more thing to note is that I CANT hear the in tank fuel pump prime when turning the key (when when cold) but it does make a noise after the car dies. Car also has a brand new pressure release valve a couple months ago. No codes

This is urgent as i start school again in a couple days and need transportation!

 

Welcome to mso, threads merged do not create multiple duplicate threads on the same issue that only adds confusion, and delays helping you. Duplicate removed .


What happens if you blip the gas when starting it? What have you tried / looked at? How's your oil level, cleaned maf sensor? Checked plugs? How long did your car sit / what ambient temps? How old is your battery? Did you check battery voltage?
I had a similar issue at -20c, cleaned maf sensor ensured correct oil level (was high) was able to by pass it and get the car to run if I gave it some gas. Took it for a good drive and she's good.

Also did you even read our troubleshooting sheet thread? Because it outlines information that we need in order to best help you get your car running.
https://mazdaspeeds.org/index.php?threads/troubleshooting-sheet.13117/

 

The issue is all the time, not intermittent. I’ve already read through all similar forms. It’s an issue in the fuel system for sure. No codes. It was working fine for months and just out of nowhere this happened. I had a new prv put in alonf wirh a used hpfp 3 months ago though but the issue that was causing was not like this. It used to hesitate a lot on wot and changed those and it fixed it.

Where is the ground on the hpfp? I’m going to look into that

 

UPDATE: car threw a P0091 code. Still can’t figure out the issue

 

Look if you can't be bothered to answer my questions so that I can point you in a better direction or tag someone then this is going to be really hard to help you. Speaking frankly it doesn't make me want to help either.

That code could be a failing fuel pressure sensor
As for the hpfp groutits not on it..it's near it I keep posting this pic it's circled it red

 

What happens if you blip the gas when starting it? Blipping the gas will make it rev higher and the fuel pressure will rise. It won’t kill it by reving it.

What have you tried / looked at? How's your oil level, cleaned maf sensor? Checked plugs? How long did your car sit / what ambient temps? How old is your battery? Did you check battery voltage?


Battery voltage, somewhat new plugs, good maf. It’s definitely a fuel issue. It just cuts all of a sudden. It will run great then out of nowhere something is causing the pressure to plummet and it’ll stall. I’m pretty sure I triggered code by playing with some wires. Since cleared the code and it hasn’t came back since. I’m honestly lost but leaning towards in tank pump as i canr hear it prime at all even when cold and checking power goinh to it the power on one of the pins goes away shortly before the car dies.

Also just checked and cleaned the ground. All is good there but the issue persists

And yes I read over the trouble shooting forum and a bunch of related forums. Nobody had the same problem as me. I checked a few things and cleaned the ground. Checked electrical connections, checked voltage ets

 

Sounds like a bad spill valve or wiring to the spill valve on the top of the hpfp if it's throwing a p0091 code

 

Finally am making progress on the car stalling issue!

I can get it to stay running by jumping one of the connectors for the in tank fuel pump with my jump pack. It will stay running with perfect fuel pressure at idle (around 500 psi). I checked all fuses, relays.

What is causing this wire going to the fuel pump to lose power? It has power right when you start it up but loses power shortly after which causes the car to die but like I said with an auxiliary jump itll stay running.

 

Check the continuity of the wire from one end to the other, it might be frayed or smt look over the whole wire. im having a fuel issue too lol