2005 Ford Mustang 4.0 V6 with 153,251 miles
Just replace both sides of my fuel pumps and hit the reset button. Car drove fine, for a day then suddenly died driving thru at an drive-thru. Didn't even sound like a stall. Just on one second, off the next, like someone flipped a kill switch. Rechecked the fuel pumps and relay. Replaced the crankshaft sensor a few days later, and the Car cranks just fine now, however, won't start and there's no check engine light and no anti theft light.
Calling Mustang specialist @mod_man
Hello, hello! {black}:laughingoutloud:
- Did you check the fuel pressure at the fuel rail? I know O'Reilly loans those tester gauges out for free and it's super fast to check. Sounds simple but maybe it's just a lack of pressure or too much. You'll want to look up what psi your car runs at, but it's probably around 40 psi. If pressure is low maybe it's a clog in the fuel filter, or somewhere in the line. If pressure is high you could check/replace the fuel pressure regulator. If all of that checks out then it seems likely to be an electrical problem. Hook up a scan tool, even a cheap one, and check for codes.
and the Car cranks just fine now, however, won't start
Try start the car with a starter fluid. If it started, you have the fuel delivery issue.
I would check the fuel pressure at the rails first. I could be wrong, but something has me thinking this one is electrical in nature.
Here is how I would approach it:
1. Check the battery and make sure it is holding a charge and everything is good and tight with minimal to no corrosion on the terminals.
2. Swap the fuel filter out if you haven't already.
3. Try to start it. If it doesn't crank over, try using starter fluid directly. If that works, it is as @yaser said a fuel delivery issue.
4. Did you replace the fuel pumps with OEM or aftermarket?
5. Something electrical is tripping.
The reason I say I think it could be electrical is the on/off way you said it shut down. That makes me think possibly the new pumps lost power due to something electrical going awry. But start with the easiest items and work your way up. Hopefully it is just a clogged filter or battery/alternator issue.
As a side note, those Mustangs do eat alternators so be sure to check that as well.
When you have the key in position II, does it usually have a check engine light?
if it doesn’t now, might be a symptom of no ECU communication.
try checking with even a cheap OBDII scanner to see if you have live data to confirm the engine computer is online
Check your battery, it might be weak and need replacing
Assuming it’s not a fuel problem. Double check the battery connections. That they are nice and tight.
