Crank, no start

Need a hand...
Changed the fuel pump bout a month n a half ago...no problems. Truck quit while in a drive thru. Battery tested bad, changed, alternator tested bad, changed...will crank but not start. Checked fuses...good, fuel pump relay...good. Disconnected fuel lines to check..when cranking, fuel squirting out (found a pressure tester a while back that didnt have proper attachments n couldnt find one local, so im doing it this way). When i disconnected mass airflow sensor n cranked, started for a second or two but dies. Disconnected the plug to throttle body n cranked, it started for about 10 seconds and died. Thinking this is throttle position sensor, but i changed throttle body maybe 3 years ago.

 

No codes?

Why did you change the fuel pump?

Spark?

 

Is your security light flashing with the key on?

 

At first, no codes except o2 sensors. They were changed about 3 yrs ago. After i tried to reset ecu n security yesterday, now the mass airflow sensor n throttle position sensor codes coming up. Changed the fuel pump because it was losing power n eventually wouldnt stay crunk after running out of gas. And by spark, do u mean checked spark plugs? Havent lately, but they were changed about 3 yrs ago as well. Ill check them next.

As for the second comment, i didnt pay attention to the security light until after i tried the resets. Im not near it now, but the light was blinking without the key in...ill have to check to see if it blinks with the key turned.

 

That may be the problem there. What codes where they? You remember the # ?

Do still check this. It’s easy to check.

 

Update...it was the fuel pump. Just changed the sucker about a month n a half ago. When u spend $80 on a fuel pump, i guess u get what u pay for. Got a warranty this time